This method aids in retaining the power of active extension of the elbow-joint.
Excision for osseous anchylosis in the extended position of the joint may be sometimes rendered very difficult by the density, firmness, and extensive hypertrophy of the bones, which become fused into one solid mass. Any attempt to isolate the bones, and remove the anchylosed joint entire, by incising the bones as if for disease, will both prove very laborious, and also probably end in doing some damage to the vessels and nerves in front. But by sawing through the anchylosis about its centre, as was pointed out many years ago by Mr. Syme, the fore-arm may be flexed, and the bones as easily displayed, cleaned, and removed, as in the operation for disease. In this operation, as there is less thickening of the skin and subjacent textures, and in consequence more risk of deficiency and even sloughing of the flaps made by the H-shaped incision, a single straight incision will serve the purpose admirably.
Partial incisions of the elbow-joint are, as a rule, less successful and more dangerous to life than complete ones, except in cases of excision for anchylosis. Even in gunshot wounds, where the bones were previously healthy, and where uninjured portions might have been left with some hopes of success, this is the case.
Dr. Heron Watson has devised the following operation for cases of anchylosis the result of injury:—(1.) A linear incision over ulnar nerve at inner side of olecranon. (2.) The ulnar nerve to be carefully turned over the inner condyle. (3.) A probe-pointed bistoury to be introduced into the elbow-joint in front of the humerus, and then behind and carried upwards, so as to divide the upper capsular attachments in front and behind. (4.) A pair of bone-forceps to be next employed to cut off the entire inner condyle and trochlea of the humerus, and then introduced in the opposite diagonal direction so as to detach the external condyle and capitulum of the humerus from the shaft. (5.) The truncated and angular end of the humerus to be divided, turned out through the incision, and smoothed across at right angles to the line of the shaft by means of the saw, whereby (6.) room might be afforded, so that partly by twisting and partly by dissection the external condyle and capitulum are removed without any division of the skin on the outer side of the arm.[56] Six cases have had satisfactory results.
The mortality from this operation is considerably less than that from amputation of the arm. Of a series of excisions for disease, injury, and anchylosis, 22.15 per cent. died, while out of a similar series of amputations of the arm the mortality was 33.4 per cent.[57] Our mortality of excision of the elbow here is certainly much less than the above. All of the cases, between thirty and forty, in which I have done it have recovered with but one exception, and Mr. Syme lost only one during the time I was his assistant.
Professor Spence lost only 16 in 189 cases, or 8.3 per cent.
Gurlt's statistics for gunshot injury give a mortality of over 24 per cent.
Out of 82 cases where the joint was excised for injury in the Schleswig-Holstein and Crimean campaigns, only 16 died; and out of 115 cases in which the joint was excised for disease, only 15 died.
The period after the injury at which the excision is performed seems to be important.