(96) A private in the Yorkshire Light Infantry was wounded at Modder River; the bullet entered between the eleventh and twelfth ribs, just posterior to the left mid-axillary line, emerging in the posterior axillary fold, at its junction with the right side of the trunk. On the second day after the injury the lower extremities became drawn up, the knees and hips assuming a flexed position, and this was followed shortly by the advent of complete motor and sensory paraplegia, accompanied by retention of urine. Two days later, the patient again passed water normally, and gradual and rapid return of both sensation and motor power took place. At the end of fourteen days no trace of the condition remained, and the patient was shortly after sent home.
(96) A private in the Yorkshire Light Infantry was wounded at Modder River; the bullet entered between the eleventh and twelfth ribs, just posterior to the left mid-axillary line, emerging in the posterior axillary fold, at its junction with the right side of the trunk. On the second day after the injury the lower extremities became drawn up, the knees and hips assuming a flexed position, and this was followed shortly by the advent of complete motor and sensory paraplegia, accompanied by retention of urine. Two days later, the patient again passed water normally, and gradual and rapid return of both sensation and motor power took place. At the end of fourteen days no trace of the condition remained, and the patient was shortly after sent home.
The symptoms, however, were rarely so simple as in this example; it was very much more common to meet with an admixture of signs of primary concussion, or at any rate symptoms of radiation. The following is an extreme but excellent example of more complicated and prolonged effects:
(97) A lance-corporal of the Black Watch was wounded at Magersfontein at a range of from 400 to 500 yards. The bullet entered over the left malar bone 2½ inches from the outer canthus, while the aperture of exit was 2¼ inches above the inferior angle of the right scapula, 3/4 of an inch anterior to its axillary margin.Very shortly after the injury complete motor and sensory paralysis developed in both upper extremities, followed by the development of a similar condition in the left lower limb, and retention of urine and fæces, but the latter unaccompanied by the marked abdominal intestinal distension so characteristic in cases of total transverse lesion. The right side of the chest continued to work well, but the intercostals of the left side were paralysed. No disturbance of the normal action or condition of the pupils was noted. After the first few days the condition began to improve.Three weeks later, the chest was moving symmetrically and well, sensation and motor power had returned in considerabledegree in the left lower extremity, with marked increase in both the plantar and patellar reflexes; sensation had returned in both upper extremities, a slight amount of motor power was regained in the right, but the left remained entirely flaccid and incapable of movement.At the end of a month power was regained over both bladder and rectum, some slight movement of the left thumb was possible, and a certain degree of hyperæsthesia developed over the back of the forearm.At the end of six weeks there was little further alteration, but that in the direction of improvement. There was some wasting of the muscles of the left upper extremity, and this was most marked in the muscles supplied by the ulnar nerve.At the end of ten weeks the patient had been up some days; he could stand and walk, but was unable to rise from the sitting posture without help. The plantar and patellar reflexes were much exaggerated, and there was ankle clonus, most marked in the left limb. The right upper extremity was normal, but weak; there was wrist-drop on the left side and the deltoid was wasted and powerless; on the other hand the fingers could be flexed, and although the elbow could not be, there were signs of returning power in the biceps, and some movements of the shoulder could be performed by the capsular muscles. It was remarkable that common sensation was more acute in the left than the right lower extremity, but I attributed this to the remains of hyperæsthesia on the left side. The patient left for home shortly after the last note.
(97) A lance-corporal of the Black Watch was wounded at Magersfontein at a range of from 400 to 500 yards. The bullet entered over the left malar bone 2½ inches from the outer canthus, while the aperture of exit was 2¼ inches above the inferior angle of the right scapula, 3/4 of an inch anterior to its axillary margin.
Very shortly after the injury complete motor and sensory paralysis developed in both upper extremities, followed by the development of a similar condition in the left lower limb, and retention of urine and fæces, but the latter unaccompanied by the marked abdominal intestinal distension so characteristic in cases of total transverse lesion. The right side of the chest continued to work well, but the intercostals of the left side were paralysed. No disturbance of the normal action or condition of the pupils was noted. After the first few days the condition began to improve.
Three weeks later, the chest was moving symmetrically and well, sensation and motor power had returned in considerabledegree in the left lower extremity, with marked increase in both the plantar and patellar reflexes; sensation had returned in both upper extremities, a slight amount of motor power was regained in the right, but the left remained entirely flaccid and incapable of movement.
At the end of a month power was regained over both bladder and rectum, some slight movement of the left thumb was possible, and a certain degree of hyperæsthesia developed over the back of the forearm.
At the end of six weeks there was little further alteration, but that in the direction of improvement. There was some wasting of the muscles of the left upper extremity, and this was most marked in the muscles supplied by the ulnar nerve.
At the end of ten weeks the patient had been up some days; he could stand and walk, but was unable to rise from the sitting posture without help. The plantar and patellar reflexes were much exaggerated, and there was ankle clonus, most marked in the left limb. The right upper extremity was normal, but weak; there was wrist-drop on the left side and the deltoid was wasted and powerless; on the other hand the fingers could be flexed, and although the elbow could not be, there were signs of returning power in the biceps, and some movements of the shoulder could be performed by the capsular muscles. It was remarkable that common sensation was more acute in the left than the right lower extremity, but I attributed this to the remains of hyperæsthesia on the left side. The patient left for home shortly after the last note.
In both these cases the absence of marked hyperæsthesia or pain points to medullary hæmorrhage (hæmato-myelia) as the pathological condition produced by the injury. In this particular they contrast well with case 94 quoted on page 315, where the degree of both hyperæsthesia and pain indicated a combination of pressure and irritation of the nerve roots by surface hæmorrhage on the affected side. In case 97 the persistence for four weeks of paralysis of the bladder and rectum suggested medullary hæmorrhage in addition, while the return of patellar reflex in the paralysed limb negatived the occurrence of an extensive destructive lesion.
In view of the extreme interest of these cases I will shortly detail one other in which the cauda equina alone was affected.
I must confess my inability to place the case definitely inthe category either of concussion or medullary hæmorrhage. As so often happened, both conditions probably took part in the lesion. The immediate development of the primary symptoms is no doubt to be referred to concussion, while the patchy nature of the prolonged lesion and gradual recession of the symptoms point to the presence of hæmorrhages. We find here the link most nearly connecting the spinal cord and the peripheral systemic nerves. Such a case goes far to show that the condition which I have in the next chapter often referred to as nerve contusion may in fact be produced by an injury far short of actual contact.
(98) A trooper in the Imperial Yeomanry, while advancing in the crouching attitude, was struck by a bullet from his left front, at an estimated distance of 300 yards. The bullet traversed the right arm anteriorly to the humerus, entered the trunk in the line of the posterior axillary fold, 1½ inch below the level of the nipple, crossed the thoracic and abdominal cavities, deeply striking the lumbar spine, and finally lodged beneath the skin over the venter of the left ilium. The skin was broken, but the force of the bullet was not sufficient to cause it to pass through, and it was later expressed from the wound by the surgeon. The bullet was a Mauser, and not in any way deformed, although it must at any rate have struck the spine and perforated the ilium.Immediate paraplegia resulted, both sensation and motor power were completely abolished, but there was no trouble either with the bladder or rectum. No symptoms of injury to either thoracic or abdominal viscera were noted.Three days after the injury sensation and some return of motor power were observed in the left extremity, and some power of movement in the toes of the right foot.During the next eight weeks steady but slow improvement took place; during the last three weeks of this period he made the voyage to England. Ever since the injury some elevation of temperature was noted, a rise at night to 100° or at times to 102°; for this no definite cause was discovered. In the tenth week the condition was as follows: The temperature has become normal. The patient has lost flesh to a considerable extent since the reception of the injury. The lower extremities are much wasted, especially the peroneal muscles. Patellar reflexes can be obtained, but the knee jerks are uncertain. Unevenly distributed paralysis exists in both lower extremities. Left—Sensation fairlygood throughout. Quadriceps very weak; does not react to electrical stimulation. Calf muscles act fairly. Anterior tibial and musculo-cutaneous groups are paralysed. Right—Quadriceps acts better than on left, muscles below the knee paralysed, and in the same area there is complete absence of sensation. The patient complains of shooting pains in both legs, and there is some deep muscular tenderness.Three weeks later an abundant crop of vesicles appeared over the front of the right thigh and leg, above and below the knee. Sensation in the limb at the same time returned to a considerable degree, anæsthesia persisting on the outer aspect of the thigh only.At the end of four months very considerable improvement had taken place, but there was no return of motor power in the right leg, or the muscles supplied by the peroneal nerve in the left leg. There was some general œdema of the legs, especially of the right, possibly in connection with the herpetic eruption which was now disappearing. Muscular tenderness had disappeared. There was also definite improvement in the size and tone of the peroneal muscles, although no motor power was regained.At the end of five months, slight gradual improvement was still taking place, but the loss of power was nearly as extensive as when the last note was taken. The skin of the right leg was glossy, that of the left apparently normal. At times some hyperæsthesia of the soles was noted, and the plantar reflex was very brisk.The right anterior tibial and musculo-cutaneous groups of muscles reacted to the strongest faradic current, not to any galvanic current below 20-25 m.a., contraction very sluggish. The same muscles in the left leg also reacted to the strongest faradic current, but only locally, with no sort of effect on the tendons. Similar contractions could be induced in the right quadriceps, but none in the left (Dr. Turney).Appreciation of heat and cold applied to the skin was fair, but, in the case of heat, distinctly slow in the right leg and foot.At the end of seven months improvement was still taking place; the patient could now stand, walk a little with crutches, and even ascend and descend a staircase.
(98) A trooper in the Imperial Yeomanry, while advancing in the crouching attitude, was struck by a bullet from his left front, at an estimated distance of 300 yards. The bullet traversed the right arm anteriorly to the humerus, entered the trunk in the line of the posterior axillary fold, 1½ inch below the level of the nipple, crossed the thoracic and abdominal cavities, deeply striking the lumbar spine, and finally lodged beneath the skin over the venter of the left ilium. The skin was broken, but the force of the bullet was not sufficient to cause it to pass through, and it was later expressed from the wound by the surgeon. The bullet was a Mauser, and not in any way deformed, although it must at any rate have struck the spine and perforated the ilium.
Immediate paraplegia resulted, both sensation and motor power were completely abolished, but there was no trouble either with the bladder or rectum. No symptoms of injury to either thoracic or abdominal viscera were noted.
Three days after the injury sensation and some return of motor power were observed in the left extremity, and some power of movement in the toes of the right foot.
During the next eight weeks steady but slow improvement took place; during the last three weeks of this period he made the voyage to England. Ever since the injury some elevation of temperature was noted, a rise at night to 100° or at times to 102°; for this no definite cause was discovered. In the tenth week the condition was as follows: The temperature has become normal. The patient has lost flesh to a considerable extent since the reception of the injury. The lower extremities are much wasted, especially the peroneal muscles. Patellar reflexes can be obtained, but the knee jerks are uncertain. Unevenly distributed paralysis exists in both lower extremities. Left—Sensation fairlygood throughout. Quadriceps very weak; does not react to electrical stimulation. Calf muscles act fairly. Anterior tibial and musculo-cutaneous groups are paralysed. Right—Quadriceps acts better than on left, muscles below the knee paralysed, and in the same area there is complete absence of sensation. The patient complains of shooting pains in both legs, and there is some deep muscular tenderness.
Three weeks later an abundant crop of vesicles appeared over the front of the right thigh and leg, above and below the knee. Sensation in the limb at the same time returned to a considerable degree, anæsthesia persisting on the outer aspect of the thigh only.
At the end of four months very considerable improvement had taken place, but there was no return of motor power in the right leg, or the muscles supplied by the peroneal nerve in the left leg. There was some general œdema of the legs, especially of the right, possibly in connection with the herpetic eruption which was now disappearing. Muscular tenderness had disappeared. There was also definite improvement in the size and tone of the peroneal muscles, although no motor power was regained.
At the end of five months, slight gradual improvement was still taking place, but the loss of power was nearly as extensive as when the last note was taken. The skin of the right leg was glossy, that of the left apparently normal. At times some hyperæsthesia of the soles was noted, and the plantar reflex was very brisk.
The right anterior tibial and musculo-cutaneous groups of muscles reacted to the strongest faradic current, not to any galvanic current below 20-25 m.a., contraction very sluggish. The same muscles in the left leg also reacted to the strongest faradic current, but only locally, with no sort of effect on the tendons. Similar contractions could be induced in the right quadriceps, but none in the left (Dr. Turney).
Appreciation of heat and cold applied to the skin was fair, but, in the case of heat, distinctly slow in the right leg and foot.
At the end of seven months improvement was still taking place; the patient could now stand, walk a little with crutches, and even ascend and descend a staircase.
Severe concussion, contusion, or medullary hæmorrhage producing signs of total transverse lesion, and complete transverse section.—The symptoms of these conditions will be taken together, because, with very slight variations, they may beconsidered as lesions of equal degree as to severity, bad prognosis, and unsuitability for active interference.
All were characterised by the exhibition of the same essential phenomena, symmetrical abolition of sensation and motor power on either side of the body, absence of any signs of irritation in the paralysed area, and loss of patellar reflex. In a small number of the cases of medullary hæmorrhage some return of sensation was observed prior to death; in a still smaller, traces of motor power, and in one or two irritability of the muscles or feeble reflexes pointed to the fact that destruction of the cord was not absolute. As abstracts of a series of cases are appended on page 330, it is only necessary to add a few remarks as to any slight peculiarities which seemed directly dependent on the mode of causation.
It may be first stated that these severe injuries were accompanied by signs of a very high degree of shock. In fact, the shock observed in them was more severe than in any other small-calibre bullet injuries that I witnessed. The patients lay still with the eyes closed, great pallor of surface, sometimes moaning with pain, the sensorium much benumbed, or occasionally early delirium was noted. The pulse was small, often slow and irregular, and the respiration shallow. The originally quiet state was often changed to one of great restlessness of the unparalysed part of the body, with the appearance of reaction.
The degree of primary pain varied greatly, but as a rule it was considerable; in some cases it was excruciating in the parts above the level of the totally destructive lesion, and commonly of the zonal variety. A hyperæsthetic zone at the lower limit of sensation usually existed.
In the majority of the cases pain must have depended on meningeal hæmorrhage. In one of the cases related, positive evidence was offered as to this particular by the autopsy, although this was made as long as six weeks after the original injury, since no other source of pressure or irritation was discovered. When I first saw this patient some twenty-four hours after the injury he was moaning with pain, although a strong and plucky man; I hastened to give him an injection of morphia, and assured him that it would relievehis suffering: as I left I heard him say to his neighbour: 'That is no use; they gave me three last night, and I was no better,' and his remark proved true.
In high dorsal and cervical injuries the temperature rose high, in one case to 108° F.; I had no opportunity, however, of observing the temperature in any case immediately before and after death. During the hot weather the profuse sweating of the upper part of the body contrasted very strongly with the dry skin of the paralysed part.
The heart's action was often particularly irregular in the dorsal injuries, and the respiration slow and irregular; as these cases, however, were often complicated by severe concurrent injuries to internal organs, the irregularities could hardly be ascribed to the spinal-cord lesion alone. In cases of pure diaphragmatic respiration, the rate did not as a rule exceed the normal of 16 or 20 to the minute, and it was quite regular; this was noted soon after the injury and persisted throughout the course of the cases. As is usually the case, both respiration and the heart's action were most embarrassed in the cases in which abdominal distension was a prominent feature. In some of the neck cases the Cheyne-Stokes type of respiration was very strongly marked.
In cases of low dorsal injury intestinal distension was extreme, and I think more troublesome than the same condition as seen in civil practice. The distension was accompanied by most persistent vomiting, continuing for days, and in the cases that lived for some time severe gastric crises of the same type occurred in some instances.
Priapism was a common symptom; but, as is seen from the cases quoted, was rarely due to any gross direct laceration of the cord.
Trophic sores were both early to develop, and extensive; primary decubitus occurred in all the cases I saw, and steady extension followed. In one case a remarkable symmetrical serpiginous ulceration developed in the area of distribution of the cutaneous branches of the external popliteal nerve on the outer side of the leg.
The paralysis in nearly every case was of the utterly flaccid type, and wasting of the muscles was early andextreme. This was occasionally accentuated by the supervention of myelitis.
Opportunities for making observations on the quantity of urine secreted were not great, and I can offer no remark as to the occurrence of polyuria. In one rapidly fatal case, however, suppression of urine occurred.
(99)Lumbar region. Transverse lesion.—Range under 1,000 yards. Wound ofentry(Mauser), over the seventh rib 1 inch from the left posterior axillary fold;exit, over the centre of the right iliac crest. Complete symmetrical motor and sensory paralysis of lower extremities, entire abolition of reflexes, retention of urine.On the ninth day there was some return of sensation in the lower extremities, and a cremasteric reflex was to be obtained. A large bedsore had developed over the sacrum. No further change occurred in the lower extremities. The patient became progressively emaciated and exhausted, cystitis persisted, the bedsore deepened. The man eventually developed signs of a large basal abscess in the left lung, and died on the forty-second day.At thepost-mortema fracture of the first lumbar lamina was discovered, with some splintering of the bone; the lumbar spinous process was attached and in its normal position. Opposite the centre of the cauda equina were the remains of a considerable hæmorrhage, both extra- and intra-dural, the nerves appearing somewhat compressed, but of normal consistency. The muscles of the back were infiltrated with putrid pus on both sides. A pulmonary abscess cavity the size of a hen's egg occupied the upper part of the lower lobe of the left lung. The kidneys were congested, and the bladder thickened and chronically inflamed.(100)Cervico-dorsal region. Total transverse lesion.—Wound ofentry(Mauser), to the right of the sixth cervical vertebra: the bullet was removed on the field from the left of the seventh dorsal spinous process, which was somewhat prominent. Complete motor and sensory paralysis extended upwards to the third intercostal space; the breathing was almost entirely diaphragmatic. Retention of urine. Entire abolition of reflexes in lower limbs and trunk. Hyperæsthesia was present in both upper extremities, with a zone of hyperæsthesia around the chest. The patient suffered greatly for some weeks from pain in the hyperæsthetic area, he developed severe cystitis and later incontinence of urine. A large trophic sacral bed-sore steadily increased in depth and size.About ten days before death, which occurred on the fifty-thirdday from exhaustion and septicæmia, the patient complained of pains in his legs; but there was no return of sensation, motion, or reflexes.At thepost-mortem, the seventh dorsal spinous process was found to be loose and the laminæ of the fifth, sixth, and seventh vertebræ were separated from the pedicles, and somewhat depressed on the left side. These laminæ were adherent to the dura, as were also a few small separated bony spiculæ. There was no sign of old hæmorrhage. The spinal cord was practically gone between the levels of the fourth and seventh dorsal vertebræ, and diffluent from myelitis up to the third cervical.(101)Dorsal region; total transverse lesion.—Wound ofentry(Mauser), in the left supra-spinous fossa of the scapula;exit, between the eleventh and twelfth ribs of the right side. Complete motor and sensory paralysis, with absence of reflexes from mid-dorsal region downwards. Upper intercostals working. Retention of urine, penis turgid. Sensation perfect to lower extremity of sternum. Early trophic sacral bed-sores developed and steadily increased in depth and extent, slighter ones developed on the heels. The paralysis was flaccid throughout. The patient gradually emaciated with fever, and died on the seventy-eighth day.At thepost-mortemthe wound proved not to have penetrated the thorax, and both the vertebral spines and laminæ were intact, no trace of bony injury being discoverable. Opposite the sixth dorsal vertebra, for a distance of 1½ inch, the cord and dura were adherent, and over the same area the cord was represented by soft custard-like material. There was no sign of old hæmorrhage.(102)Dorsal region; total transverse lesion; slight extra-dural hæmorrhage.—Wound ofentry(Mauser), at the posterior aspect of the right shoulder;exit, 2 inches to the left of the spine below the ninth rib.Complete motor and sensory paralysis below the site of the lesion, with absence of superficial and deep reflexes. Retention of urine. Great abdominal distension, pain, and vomiting. Bed-sores over the sacrum developed on the third day; meanwhile the vomiting continued on and off for a week, and very severe girdle pain persisted.One month later when seen at the Base hospital considerable improvement had occurred. Sensation had returned in both lower limbs; but flaccid paralysis persisted and both were wasted, especially the left. There was no return of reflexes in the lowerlimbs, the urine was passed in gushes, and the patient was cognisant when these occurred. The sacral bed-sores were, however, very extensive and becoming larger and deeper.At the end of the fifth week slight power was regained in the flexors and abductors of the right thigh, and the same muscles of the left limb could be made to contract feebly. Meanwhile the patient suffered with severe fever, accompanied by frequent rigors and profuse sweats; the bed-sore continued to extend, and the urine was foul and contained pus.The patient continued in a similar condition, progressive emaciation and exhaustion taking place, and at the end of six weeks he died.At thepost-mortemthe bullet was found to have tracked beneath the right scapula, entering the chest by the fifth intercostal space and lacerating the right lung; thence it entered the eighth dorsal centrum and tunnelled both this and the ninth diagonally, to escape beneath the ninth rib. On opening the spinal canal the tunnel was found to be separated only by the compact tissue of the centrum from the cavity, while a thin extra-dural hæmorrhage separated the dura from the bones anteriorly. The spinal cord exhibited no sign of pressure and was firm and continuous, but up to the lower limit of the dorsal region there was septic myelitis and meningitis, the result of pus having tracked up the canal from the sacral bedsore. Suppurative cystitis and pyelitis were present. The patient was the subject of an old urethral stricture which had given rise to trouble during treatment.(103)Dorsal region; total transverse lesion; slight intra-dural hæmorrhage.—Wound ofentry(Mauser), below spine of scapula, close to right axilla;exit, 2½ inches to left of tenth dorsal spinous process.Complete motor and sensory paralysis below ensiform cartilage, with well-marked hyperæsthetic zone around trunk. All reflexes absent. Retention of urine. Incontinence of fæces. Bed-sores in sacral region developed during the first two days, and seventeen days later well-developed serpiginous trophic sores developed on the outer side of each leg and continued to increase slowly until death. The paralysis remained of the absolutely flaccid variety. Great emaciation occurred, accompanied by hectic fever, the temperature ranging from normal to 102.5°. During the third week double pleurisy developed.At thepost-mortemno bone injury could be detected. The cord and dura-mater were adherent over an area corresponding to thefifth to the eighth dorsal vertebræ, and opposite the seventh the cord was soft and of the consistence of butter. A small intra-dural hæmorrhage was still evident below the main lesion, not extensive enough to give rise to serious compression. General adhesions in each pleura. Cystitis.
(99)Lumbar region. Transverse lesion.—Range under 1,000 yards. Wound ofentry(Mauser), over the seventh rib 1 inch from the left posterior axillary fold;exit, over the centre of the right iliac crest. Complete symmetrical motor and sensory paralysis of lower extremities, entire abolition of reflexes, retention of urine.
On the ninth day there was some return of sensation in the lower extremities, and a cremasteric reflex was to be obtained. A large bedsore had developed over the sacrum. No further change occurred in the lower extremities. The patient became progressively emaciated and exhausted, cystitis persisted, the bedsore deepened. The man eventually developed signs of a large basal abscess in the left lung, and died on the forty-second day.
At thepost-mortema fracture of the first lumbar lamina was discovered, with some splintering of the bone; the lumbar spinous process was attached and in its normal position. Opposite the centre of the cauda equina were the remains of a considerable hæmorrhage, both extra- and intra-dural, the nerves appearing somewhat compressed, but of normal consistency. The muscles of the back were infiltrated with putrid pus on both sides. A pulmonary abscess cavity the size of a hen's egg occupied the upper part of the lower lobe of the left lung. The kidneys were congested, and the bladder thickened and chronically inflamed.
(100)Cervico-dorsal region. Total transverse lesion.—Wound ofentry(Mauser), to the right of the sixth cervical vertebra: the bullet was removed on the field from the left of the seventh dorsal spinous process, which was somewhat prominent. Complete motor and sensory paralysis extended upwards to the third intercostal space; the breathing was almost entirely diaphragmatic. Retention of urine. Entire abolition of reflexes in lower limbs and trunk. Hyperæsthesia was present in both upper extremities, with a zone of hyperæsthesia around the chest. The patient suffered greatly for some weeks from pain in the hyperæsthetic area, he developed severe cystitis and later incontinence of urine. A large trophic sacral bed-sore steadily increased in depth and size.
About ten days before death, which occurred on the fifty-thirdday from exhaustion and septicæmia, the patient complained of pains in his legs; but there was no return of sensation, motion, or reflexes.
At thepost-mortem, the seventh dorsal spinous process was found to be loose and the laminæ of the fifth, sixth, and seventh vertebræ were separated from the pedicles, and somewhat depressed on the left side. These laminæ were adherent to the dura, as were also a few small separated bony spiculæ. There was no sign of old hæmorrhage. The spinal cord was practically gone between the levels of the fourth and seventh dorsal vertebræ, and diffluent from myelitis up to the third cervical.
(101)Dorsal region; total transverse lesion.—Wound ofentry(Mauser), in the left supra-spinous fossa of the scapula;exit, between the eleventh and twelfth ribs of the right side. Complete motor and sensory paralysis, with absence of reflexes from mid-dorsal region downwards. Upper intercostals working. Retention of urine, penis turgid. Sensation perfect to lower extremity of sternum. Early trophic sacral bed-sores developed and steadily increased in depth and extent, slighter ones developed on the heels. The paralysis was flaccid throughout. The patient gradually emaciated with fever, and died on the seventy-eighth day.
At thepost-mortemthe wound proved not to have penetrated the thorax, and both the vertebral spines and laminæ were intact, no trace of bony injury being discoverable. Opposite the sixth dorsal vertebra, for a distance of 1½ inch, the cord and dura were adherent, and over the same area the cord was represented by soft custard-like material. There was no sign of old hæmorrhage.
(102)Dorsal region; total transverse lesion; slight extra-dural hæmorrhage.—Wound ofentry(Mauser), at the posterior aspect of the right shoulder;exit, 2 inches to the left of the spine below the ninth rib.
Complete motor and sensory paralysis below the site of the lesion, with absence of superficial and deep reflexes. Retention of urine. Great abdominal distension, pain, and vomiting. Bed-sores over the sacrum developed on the third day; meanwhile the vomiting continued on and off for a week, and very severe girdle pain persisted.
One month later when seen at the Base hospital considerable improvement had occurred. Sensation had returned in both lower limbs; but flaccid paralysis persisted and both were wasted, especially the left. There was no return of reflexes in the lowerlimbs, the urine was passed in gushes, and the patient was cognisant when these occurred. The sacral bed-sores were, however, very extensive and becoming larger and deeper.
At the end of the fifth week slight power was regained in the flexors and abductors of the right thigh, and the same muscles of the left limb could be made to contract feebly. Meanwhile the patient suffered with severe fever, accompanied by frequent rigors and profuse sweats; the bed-sore continued to extend, and the urine was foul and contained pus.
The patient continued in a similar condition, progressive emaciation and exhaustion taking place, and at the end of six weeks he died.
At thepost-mortemthe bullet was found to have tracked beneath the right scapula, entering the chest by the fifth intercostal space and lacerating the right lung; thence it entered the eighth dorsal centrum and tunnelled both this and the ninth diagonally, to escape beneath the ninth rib. On opening the spinal canal the tunnel was found to be separated only by the compact tissue of the centrum from the cavity, while a thin extra-dural hæmorrhage separated the dura from the bones anteriorly. The spinal cord exhibited no sign of pressure and was firm and continuous, but up to the lower limit of the dorsal region there was septic myelitis and meningitis, the result of pus having tracked up the canal from the sacral bedsore. Suppurative cystitis and pyelitis were present. The patient was the subject of an old urethral stricture which had given rise to trouble during treatment.
(103)Dorsal region; total transverse lesion; slight intra-dural hæmorrhage.—Wound ofentry(Mauser), below spine of scapula, close to right axilla;exit, 2½ inches to left of tenth dorsal spinous process.
Complete motor and sensory paralysis below ensiform cartilage, with well-marked hyperæsthetic zone around trunk. All reflexes absent. Retention of urine. Incontinence of fæces. Bed-sores in sacral region developed during the first two days, and seventeen days later well-developed serpiginous trophic sores developed on the outer side of each leg and continued to increase slowly until death. The paralysis remained of the absolutely flaccid variety. Great emaciation occurred, accompanied by hectic fever, the temperature ranging from normal to 102.5°. During the third week double pleurisy developed.
At thepost-mortemno bone injury could be detected. The cord and dura-mater were adherent over an area corresponding to thefifth to the eighth dorsal vertebræ, and opposite the seventh the cord was soft and of the consistence of butter. A small intra-dural hæmorrhage was still evident below the main lesion, not extensive enough to give rise to serious compression. General adhesions in each pleura. Cystitis.
Fig. 79.Fig. 79.
Appearance of Spinal Cord enclosed in membranes in case 103 after removal from the canal. When the membranes were opened a white custard-like substance took the place of the cord. Slight evidence of extra-dural hæmorrhage existed
(104)Dorsal region; section of cord; retained bullet.—Wound ofentry(Mauser), in seventh right intercostal space, 4½ inches from the dorsal spinous processes, oval in outline; bullet retained.Complete motor and sensory paralysis, with absence of reflexes below umbilicus. Retention of urine, incontinence of fæces. Large sacral bed-sore developed rapidly. Right hæmothorax.The patient emaciated rapidly, and for the last fourteen days the temperature ranged to 104°, the bed-sore steadily increasing in size. Death occurred on the forty-second day.At thepost-mortema Mauser bullet was found embedded in the centrum of the twelfth dorsal vertebra. The bullet was slightly curved; its anterior extremity had passed across the spinal canal, and wounding the dura posteriorly rested against the left lamina. The plating of the mantle of the bullet was stripped from half the area of the tip. The dura was not adherent,and the cord was softened for half an inch above the point of section; above this it was normal, the vessels coursing normally to the softened spot. Below the point of section the cord was blanched, but offered no other macroscopic evidence of disease. No evidence of either intra- or extra-dural hæmorrhage was detectible.
(104)Dorsal region; section of cord; retained bullet.—Wound ofentry(Mauser), in seventh right intercostal space, 4½ inches from the dorsal spinous processes, oval in outline; bullet retained.
Complete motor and sensory paralysis, with absence of reflexes below umbilicus. Retention of urine, incontinence of fæces. Large sacral bed-sore developed rapidly. Right hæmothorax.
The patient emaciated rapidly, and for the last fourteen days the temperature ranged to 104°, the bed-sore steadily increasing in size. Death occurred on the forty-second day.
At thepost-mortema Mauser bullet was found embedded in the centrum of the twelfth dorsal vertebra. The bullet was slightly curved; its anterior extremity had passed across the spinal canal, and wounding the dura posteriorly rested against the left lamina. The plating of the mantle of the bullet was stripped from half the area of the tip. The dura was not adherent,and the cord was softened for half an inch above the point of section; above this it was normal, the vessels coursing normally to the softened spot. Below the point of section the cord was blanched, but offered no other macroscopic evidence of disease. No evidence of either intra- or extra-dural hæmorrhage was detectible.
Fig. 80.Fig. 80.
Complete division of Spinal Cord. The bullet is retained, and from its position can be seen to have struck the right half of the cord only. The nickel plating of half of the tip of the bullet is stripped off. Case No. 104
The right pleura contained a large quantity of dark cocoa-like fluid. Extensive adhesions were present in both pleural cavities. The spleen was much enlarged. At the base of the bladder a large submucous hæmorrhage had occurred, the blood-clot had assumed a dark orange colour, and on first opening the viscus the appearance was that of a mass of fæces. The mucous lining elsewhere was slaty grey, with small hæmorrhages. The kidneys were large, but no abscesses or pyelitis were present.(105)Cervico-dorsal region; total transverse lesion.—Wound ofentry(Mauser), opposite right sixth cervical transverse process;exit, on left side of third dorsal spinous process. Slight grasping power was present in the hands, and the patient could hold his arms across his chest. Complete motor and sensory paralysis, with absence of all reflexes below. The pupils were moderately contracted. Retention of urine. On the second day blebs appeared on each buttock, and the patient complained of very severe pain in the neck: the temperature rose to 103°, and on the third day he died suddenly. Nopost-mortemexamination was made.
The right pleura contained a large quantity of dark cocoa-like fluid. Extensive adhesions were present in both pleural cavities. The spleen was much enlarged. At the base of the bladder a large submucous hæmorrhage had occurred, the blood-clot had assumed a dark orange colour, and on first opening the viscus the appearance was that of a mass of fæces. The mucous lining elsewhere was slaty grey, with small hæmorrhages. The kidneys were large, but no abscesses or pyelitis were present.
(105)Cervico-dorsal region; total transverse lesion.—Wound ofentry(Mauser), opposite right sixth cervical transverse process;exit, on left side of third dorsal spinous process. Slight grasping power was present in the hands, and the patient could hold his arms across his chest. Complete motor and sensory paralysis, with absence of all reflexes below. The pupils were moderately contracted. Retention of urine. On the second day blebs appeared on each buttock, and the patient complained of very severe pain in the neck: the temperature rose to 103°, and on the third day he died suddenly. Nopost-mortemexamination was made.
I observed two similar cases in the Field Hospital at Orange River, the patients dying on the third day; pain and high temperature were prominent symptoms in both. In one patient early delirium was present.
(106)Dorsal region; Martini-Henry wound.—Wound ofentry, oval, 1 inch ×3¼ inches; long axis obliquely crossing infra-spinous fossa of right scapula; bullet retained (Martini-Henry). Spine of third dorsal vertebra loose, and a distinct thickening to its right side. Complete symmetrical paralysis extending up to upper extremities. No sensation on surface of trunk below cervical area. Respiration entirely diaphragmatic. Retention of urine, penis turgid. Total absence of reflexes, superficial and deep. Reddening of buttocks, but no bullæ.General hyperæsthesia of upper extremities, with severe spasmodic attacks of pain.On the third day an exploration was decided upon, in view of the local deformity, and the severe pain in the upper extremities. The third dorsal spine was found to be loose, as a result of bilateral fracture of the neural arch; the bullet had crossed the right limit of the spinal canal, and destroyed the body of the vertebra, and passing onwards had entered the left pleural cavity, into which air entered freely from the operation wound.The patient was relieved from his pain by the exploration, and lived four days. On the second day after operation, however, the temperature rose to 107°, while on the last two days the temperature was normal in the mornings, rising to 105° in the evenings. No alteration resulted in the trunk symptoms.
(106)Dorsal region; Martini-Henry wound.—Wound ofentry, oval, 1 inch ×3¼ inches; long axis obliquely crossing infra-spinous fossa of right scapula; bullet retained (Martini-Henry). Spine of third dorsal vertebra loose, and a distinct thickening to its right side. Complete symmetrical paralysis extending up to upper extremities. No sensation on surface of trunk below cervical area. Respiration entirely diaphragmatic. Retention of urine, penis turgid. Total absence of reflexes, superficial and deep. Reddening of buttocks, but no bullæ.
General hyperæsthesia of upper extremities, with severe spasmodic attacks of pain.
On the third day an exploration was decided upon, in view of the local deformity, and the severe pain in the upper extremities. The third dorsal spine was found to be loose, as a result of bilateral fracture of the neural arch; the bullet had crossed the right limit of the spinal canal, and destroyed the body of the vertebra, and passing onwards had entered the left pleural cavity, into which air entered freely from the operation wound.
The patient was relieved from his pain by the exploration, and lived four days. On the second day after operation, however, the temperature rose to 107°, while on the last two days the temperature was normal in the mornings, rising to 105° in the evenings. No alteration resulted in the trunk symptoms.
Diagnosis.—The pure question of the fact of injury of the spinal cord needs no discussion; but it is necessary to make some remarks on the discrimination between concussion, contusion and hæmorrhage, meningeal and medullary hæmorrhage, the latter condition and compression, and on partial and complete severance of the cord.
The sharp discrimination of cases of concussion from those of slight medullary hæmorrhage was necessarily impossible. I think the only points of any importance in diagnosing pure concussion were the transitory nature of the symptoms, and the uniformity of recovery, without persistence of any signs of minor destructive lesion. In medullary hæmorrhage the tendency for a certain period wastowards increase in gravity in the signs. It goes almost without saying that the latter point was seldom accurately determined in patients struck on the field of battle; these perhaps lay out for hours before they were brought in, and when they were placed in the Field hospital the rush of work did not usually allow the careful observation necessary to clear up this difference in the development of the symptoms. Nevertheless it is preferable to consider the cases in which transitory symptoms persist for a period of hours, or even a couple of days, as instances of pure concussion, unless the existence of this condition can be disproved by actual observation.
Extra-medullary hæmorrhage, accompanied by only slight encroachment on the spinal canal, certainly results with some frequency from small-calibre wounds. Some of the quoted cases show this decisively bypost-mortemevidence, others by such clinical signs of irritation as pain and hyperæsthesia. I think its presence may also be assumed in cases of total transverse lesion due to medullary hæmorrhage or severe concussion, accompanied by well-marked pain and hyperæsthesia above the level of paralysis. As affecting treatment, however, determination of its presence is of small importance.
The important conditions for discriminative diagnosis are those of local compression, actual destructive lesion, whether from concussion changes, contusion, or medullary hæmorrhage, and partial and total section of the cord.
First, with regard to compression of the cord, the possible sources are three; (i) extra-dural hæmorrhage, which may, I think, be dismissed with mention as rarely capable of producing severe symptoms. (ii) The displacement of bone fragments. This is of less importance than in civil practice, because an injury by a bullet of small calibre, capable of seriously displacing fragments, has probably at the same time produced grave changes in the cord. In the presence of severe immediate symptoms we may tentatively assume that a simultaneous destructive lesion has been produced. In such injuries pain, combined with a tendency to improvement in the paralytic symptoms and return of reflexes, is the only point in favour of bone pressure, unless considerable deformityof the spinal column can be detected by palpation or examination with the X-rays.
(iii) Pressure from the bullet. This is the most important form of compression, because the mere fact of retention of the bullet is evidence of a low degree of velocity, and therefore opposed to the existence of the most severe form of intramedullary lesion. In a case of apparent transverse lesion with retained bullet, shown to me at No. 3 General Hospital by Mr. J. E. Ker, the pain was very severe, and so greatly aggravated by movement that an anæsthetic had to be administered prior to the renewal of some necessary dressings. The general condition of this patient precluded a projected operation, and after death the bullet was found to be pressing laterally upon a cord not materially altered on macroscopic inspection. In the case of retained bullet recorded (No. 104), the slight degree to which the severed ends of the cord appeared altered has been already remarked upon.
Beyond this we are helped by the position of the aperture of entry, and its shape, as evidence of the direction in which the bullet passed, the presence of pain, and positive proof may be obtained by examination with the X-rays.
Lastly, we come to the discrimination of total or partial section, destruction by vibratory concussion or contusion, and severe intramedullary hæmorrhage. Except in the case of partial section with localised symptoms, which must be rare, I believe this to be impossible from the primary symptoms, although some indication of possible encroachment on the canal may be obtained from careful consideration of the course of the wound, as evidenced by the position and shape of the openings, the position of the patient's body at the time of reception of the injury being taken into consideration. Later we may get some aid from the possible improvement in the symptoms in the case of hæmorrhage. In cases with signs of total transverse lesion, however, the discrimination of the conditions is of little practical importance, since either is equally unfavourable and unsuitable for surgical treatment.
In closing these remarks reference must be made to the occasional occurrence of paraplegic symptoms of an apparently purely functional nature. I saw these on one or two occasions,of which the following is a fair example. A man was wounded in the lower extremity and fell. When brought into the hospital he complained of loss of power in the legs and inability to straighten his back. No very definite evidence was present of serious impairment either of motor or sensory nerves, and the man was got up and walked with crutches. While moving about the hospital camp, another man pushed him down, and the patient then became completely paraplegic. He was placed in bed, and the next day moved his limbs without any difficulty, and gave rise to no further anxiety.
Prognosis.—In slight concussion the importance of prognosis is as to remote effects, and upon this no opinion can be given at the present time. The same may be said concerning cases in which transient symptoms followed the slighter degrees of surface and medullary hæmorrhage. In the case of the latter, however, I think it would be rash to give a too confident opinion as to the future non-occurrence of secondary changes.
Severe concussion is probably irrecoverable.
Meningeal hæmorrhage of either form is one of the slighter lesions, and less dangerous, both as an immediate condition and as to the probabilities of after trouble. None the less the possibilities of secondary chronic meningitis, or chronic trouble from adhesions, must be kept in mind.
Cases of medullary hæmorrhage with incomplete signs are favourable in prognosis, as far as life is concerned; as to complete recovery, however, this is hardly possible; in many cases serious functional deficiency at any rate will remain, while in others the healing of the lacerated tissue and subsequent contraction can scarcely fail to influence unfavourably an already imperfect recovery.
I think it must be a rare occurrence for pressure from bone fragments to be able to be regarded as a favourable prognostic condition, since in the very large majority of cases the velocity of the bullet causing the injury will have been such as to inflict irreparable damage on the cord. Still, cases may occasionally be met with where the velocity has been sufficiently low, or contact with the bone slight enough, to allow of the comparative escape of the cord. In this relationcases in which the bullet is retained, especially if the symptoms of transverse lesion are incomplete, may be regarded as relatively favourable.
Cervical and high dorsal injuries, as in civil practice, offered the worst prognosis. In cases in which symptoms of total transverse lesion were present, as far as my experience went, it was, however, only a matter of importance as to the prolongation of a miserable existence. All the patients eventually died; those with higher lesions at the end of a few days; the lower ones, at the completion on an average of six weeks of suffering.
The actual causes of death resembled exactly those met with in civil practice, except in so far as it was more often influenced or determined by concurrent injuries, a complication so characteristic of modern gunshot wounds. Thus exhaustion, septicæmia from absorption from suppurating bed-sores or from severe cystitis, secondary myelitis, and pulmonary complications, carried off most of the patients.
Treatment.—The general treatment of the cases demanded nothing special to military surgery, except in so far as it was modified by the disadvantage to the patient of necessarily having to be transported, often for some distance. The ill effects of this, particularly in cases of hæmorrhage, are obvious, but in so far as fracture was concerned the question of transport did not acquire the importance that it does in civil practice, since the nature of the fractures and their strict localisation did not render movement either painful or particularly hurtful. It was indeed striking how little pain movement, made for the purposes of examination, caused these patients. The treatment of bed-sores, cystitis, or other secondary complications possessed no special features.
The importance of insuring rest in the early stages of the cases of hæmorrhage is self-evident; hence, if the possibility exists of not moving the patient, its advantage cannot be too strongly insisted upon. Again, if transport is inevitable, the shorter distance that can be arranged for the better. It should be borne in mind, also, that from the peculiar nature of causation of the injuries, stretcher or wagon transport for short distances is preferable to the vibratory movements ofa long railway journey. Beyond this the administration of opium, and in some cases the assumption of the prone position, are both useful in the recent or possibly progressive stage of hæmorrhage.
Lastly, as to active surgical treatment by operation. In no form of spinal injury is this less often indicated, or less likely to be useful. It is useless in the cases of severe concussion, contusion, or medullary hæmorrhage which form such a very large proportion of those exhibiting total tranverse lesion, and equally unsuited to cases of partial lesion of the same character. Extra-medullary hæmorrhage can rarely be extensive enough to produce signs calling for the mechanical relief of pressure; the section of the cord cannot be remedied. In one case with signs of total transverse lesion, in which a laminectomy was performed, no apparent lesion was discovered, and this would frequently be the case, since the damage is parenchymatous. The experience was indeed exactly comparable to that which followed early exposure of the peripheral nerves.
Only three indications for operation exist. 1. Excessive pain in the area of the body above the paralysed segment; operation is here of doubtful practical use, except in so far as it relieves the immediate sufferings of the patient.
2. An incomplete or recovering lesion, when such is accompanied by evidence furnished by the position of the wounds, pain, and signs of irritation of pressure from without, or possibly palpable displacement of parts of the vertebra, that the spinal canal is encroached upon by fragments of bone.
3. Retention of the bullet, accompanied by similar signs to those detailed under 2.
In both the latter cases the aid of the X-rays should be invoked before resorting to exploration.
Operation, if decided upon, in either of the two latter circumstances, may be performed at any date up to six weeks; but if pressure be the actual source of trouble, it is obvious that the more promptly operation is undertaken the better for early relief and ulterior prognostic chances.
In only one case of the whole series I observed did it seem possible to regret the omission of an exploration.
The occurrence of these injuries has undoubtedly increased in frequency with the employment of bullets of small calibre, and no other class of case more strikingly illustrates the localised nature of the lesions produced by small projectiles of high velocity. Again, no other series of injuries affords such obvious indications of the firm and resistent nature of the cicatricial tissue formed in the process of repair of small-calibre wounds, and in none is the advantage of a conservative and expectant attitude so forcibly impressed upon the surgeon. Implication of the nerves may be primary, or secondary to an injury which left them originally unscathed.
Nature of the anatomical lesions.—In degree these vary in mathematical progression, but the extent of the lesion is not always readily differentiated by the early clinical manifestations, and again the actual damage is not to be estimated by the gross apparent anatomical lesion alone; but, in addition, consists in part in changes of a less easily demonstrable nature, varying with the velocity with which the bullet was travelling and the consequent comparative degree of vibratory force to which the nerve has been subjected. In these injuries, as in those of every part of the nervous system, the degree of velocity appears to gain especial importance both in regard to the general symptoms and the local effect on the functional capacity of the nerve.
This is perhaps a fitting place for the introduction of a few further remarks as to the significance of the term 'concussion' in connection with the injuries produced by bullets of small calibre, since the most striking exemplification of the results following the transmission of the vibratory force of the projectileis afforded by the behaviour of the comparatively densely ensheathed and supported peripheral nerves.
As already pointed out in Chapters VII. and VIII. the chief concussion effects on the nervous tissue of the brain and spinal cord are of a destructive nature, far exceeding those accompanying the injuries designated by the same term seen in the ordinary accidents met with in civil practice, and this damage is comparatively localised in extent.
In the case of the peripheral nerves I have still employed the terms 'concussion' and 'contusion' to designate certain groups of symptoms and clinical phenomena, but any sharp distinction between the two conditions on a morbid anatomical basis is impossible. The results of severe vibratory concussion may, in fact, be more generally destructive than those of contusion, and the subsequent effects more prolonged. A certain length of the affected nerve is apparently completely destroyed as a conductor of impulses, the connective-tissue element alone remaining intact. Under these circumstances a nerve, the subject of the most serious degree of vibratory concussion, which, if cut down upon, may exhibit no macroscopic change, may take a longer period to recover than one in which the presence of considerable local thickening points to direct contact with the bullet, with resulting hæmorrhage into the nerve sheath and perhaps partial gross rupture of nerve fibres.
The therapeutic and prognostic importance of the above remarks, if correct, is obvious. The course of the nerve is preserved by its intact connective-tissue framework, and ultimate recovery by a regeneration of the nerve fibres is more likely to be complete, and will be just as rapid, if nature be relied on and the nerve be left untouched by the hand of the surgeon.
It is, I think, undeniable that nerve trunks may escape severe or irrecoverable injury by lateral displacement. The mere fact that the trunk itself may be perforated by a slit in its long axis would suggest the possibility of displacement of the whole structure, and this no doubt occurred with some frequency. Displacement would naturally be most frequent in the case of nerves, such as those of the arm, which run long courses in comparatively loose tissue. In a remarkablecase already narrated, an exploratory operation showed the musculo-spiral nerve in the upper part of the arm to have been driven into a loop which projected into, and provisionally closed, an opening in the brachial artery.
I.Simple concussion.—Anatomically, or histologically, no information exists as to the changes which give rise to the often transitory symptoms dependent on this condition. We are reduced to the same theories of molecular disturbance and change which have been invoked to account for similar affections of the central nervous system. The causation of concussion is, however, materially influenced in its degree by the velocity of flight of the bullet and consequent severity of the vibratory force exerted. Hence actual contact of the bullet with the nerves is not necessary for its production, as is seen in the temporary complete loss of functional capacity in the limbs in many cases of fracture, where the vibrations are rendered still more far-reaching and effective as the result of their wider distribution from the larger solid resistance afforded by the bone. The relative density and resistance offered by the different parts of the bone acquire great significance in this relation, since local shock due to nerve concussion is far more profound when the shafts are struck than when the cancellous ends furnish the point of impact.
The form of concussion which most nearly interests us in this chapter is that affecting single nerve trunks in wounds of the soft parts alone, and here the passage of the bullet is, as a rule, so contiguous to the nerve that there is difficulty in drawing a strict line of demarcation between such cases and those dealt with in the next paragraph.
II.Contusion.—Clinically this was the form of nerve injury both of greatest comparative frequency and of interest from the points of view both of diagnosis and prognosis.
The seriousness of a contusion depends on two factors: first, the relative degree of violence exerted upon the nerve, which is dependent on the force still retained by the travelling bullet; and, secondly, on the extent of tissue actually implicated. The range of fire at which the injury was received determines the importance of the first factor; the second varieswith the degree of exactness with which the nerve is struck, and on the direction taken by the bullet. Naturally transverse wounds affect a small area; while an oblique or longitudinal direction of the track may indefinitely increase the extent of injury to the nerve trunk, and hence acquire prognostic significance in direct ratio to the amount of tissue which needs to be regenerated.
As to the actual anatomical lesion resulting in the cases which we designated clinically as contusion I can give no information. On many occasions when the symptoms were considered of such a nature as to render an exploration advisable, no macroscopic evidence of gross injury was obtained. It was therefore impossible to draw a definite line of demarcation between such cases and those which we considered merely concussion. It could only be assumed that the vibration transmitted to the nerve had occasioned such changes as to destroy its capacity as a conductor of impressions.
In some cases the presence of a certain amount of interstitial blood extravasation was suggested clinically by early hyperæsthesia and signs of irritation; in others the paralysis was of such a degree as to lead to the inference that a complete regeneration of the existing nerve would be necessary prior to the restitution of functional capacity.
In a certain proportion of the injuries the development of a distinct fusiform swelling in the course of the nerve pointed to the existence of considerable tissue damage, while in others this was evidenced clinically by early signs of neuritis.
III.Division or laceration.—The varying mechanical conditions affecting the last class of injury play a similar rôle here. Thus the degree of laceration depends on the direction of the wound track, and as all lacerations are accompanied by contusion, the relative velocity retained by the travelling bullet assumes the same importance.
I saw every degree of injury to the trunks, from notching to complete solution of continuity, and in some cases destruction and disappearance of pieces from one to two or more inches in length. Such lesions as the latter were most common in the forearm. In this segment of the limbs tracks of varying degrees of longitudinal obliquity are readily produced,whether the patient be in the upright or prone position, since the upper extremities are commonly in forward action whichever position is assumed.
The most peculiar form of injury consisted in perforation of the trunk without gross destruction of its fibres, and without in many cases prolonged or permanent loss of functional capacity. I cannot speak with any confidence as to the comparative frequency of occurrence of this form of injury, but judging by the analogous perforations of the vessels, it is probably not uncommon in trunks large enough to allow of its production. The trunk nerves of the arm, and the great sciatic nerve, were probably the most frequent seats of such wounds. As, however, a very short experience of the futility of early interference in the case of nerve lesions warned me against exploration before a date at which observations of this nature were unsatisfactory, I gained less experience on this point than I could have wished.
In the case of completely divided nerves the development of a bulbous enlargement on the proximal end was constant, and very marked in degree. I saw few cases in which primary effects could be certainly referred to pressure or laceration by bone spicules, excepting in some fractures of the humerus, and perhaps some injuries of the seventh nerve accompanying perforating wounds of the mastoid process.
IV.Secondary implication of the nerves.—This was a striking characteristic in many at first apparently simple wounds of the soft parts. In such cases it was due to implication of the contiguous trunk in the process of cicatrisation, and its importance varied with the size of the nerve in question. In the smaller sensory trunks it was often evidenced by the occurrence of neuralgic pain, especially liable to be influenced by climatic changes; in the larger, by signs of more or less severe motor, sensory, and trophic disturbance. Musculo-spiral paralysis from implication in, or pressure from, callus in cases of fracture of the humerus was very frequent. This would naturally be expected from the extreme degree the comminution of the bone often reached, and the consequently large amount of callus developed.
The effect of cicatrisation of the tissues surrounding thenerves varied somewhat according to the degree of fixation of the individual nerve implicated. Thus if a nerve lay in a fixed bed some form of circular constriction resulted; if, on the other hand, the nerve was readily displaceable, the cicatrix often drew it considerably out of its course; in either case symptoms corresponding with those of pressure resulted.
Symptoms of nerve lesion.—These differed little in character from those common to such injuries in civil practice, except in the relative frequency with which they assumed a serious aspect. After all in civil practice nerve concussion is most familiar to us in the degree common after knocking the elbow against a hard object, and the same may be said in regard to the allied injury of contusion. It is in small-calibre bullet wounds alone that the occurrence of such severe and sharply localised injury to deep parts as was observed is possible.
Concussion.—Temporary loss of function was often observed in the limbs, corresponding to the distribution of one or more nerve trunks when wound tracks had passed in their vicinity. Interference with function sometimes amounted to loss of sensation alone: in others to loss of both sensation and motor power. Such symptoms were of a transitory character, lasting for a few days or a week; if both sensation and motion were impaired, sensation was usually the first to be regained. In these cases secondary trouble was not uncommon, since the near proximity of the track to the originally affected nerve offered every chance for implication of the latter in the resulting cicatrix. This sequence was often observed, and its symptoms are described under the heading of secondary implication below. Equally striking were the instances of concussion in the case of the nerves of special sense and their end organs, temporary loss of smell, vision, or hearing being not uncommon, often passing off in the course of a few days with no apparent ulterior ill-effect.
One of the most interesting illustrations of the occurrence of concussion was furnished by cases in which complete paralysis of a limb rapidly cleared up with the exception of that corresponding to a single individual nerve of the complex apparently originally implicated. Instances of severe contusionor division of one nerve of the arm, for instance, accompanied by transient signs of concussion of varying degrees of severity in all the others, were by no means uncommon.
Contusion.—The symptoms of contusion were somewhat less simple, since, in addition to lowering or loss of function, signs of irritation were often observed. In the slighter cases irritation was often a marked feature, as was evidenced by hyperæsthesia and pain combined with loss of power. In cases in which pain and hyperæsthesia were primary symptoms, these were often transitory. I will quote an illustrative case which, though affecting the nerve roots, is characteristic of the effects of slight contusion in the case of the nerve trunks in any part of their course:—