A practical treatise on fractures and dislocations . the ulna has been ac-tually displaced, not only backwards, but upwards; indeed, it is verycertain that without either a luxation of the radius, or a fracture withdisplacement of the external condyle of the humerus, or a fracture orbending of the radius, an upward displacement of the ulna, to thedegree represented by the reporters of these cases, could never haveoccurred. The example mentioned by Sir Astley Cooper, and of whicha dissection was made, is plainly a case of subluxation of both bones;or if the luxation of the ulna may be regarded
A practical treatise on fractures and dislocations . the ulna has been ac-tually displaced, not only backwards, but upwards; indeed, it is verycertain that without either a luxation of the radius, or a fracture withdisplacement of the external condyle of the humerus, or a fracture orbending of the radius, an upward displacement of the ulna, to thedegree represented by the reporters of these cases, could never haveoccurred. The example mentioned by Sir Astley Cooper, and of whicha dissection was made, is plainly a case of subluxation of both bones;or if the luxation of the ulna may be regarded as having been com-plete, the head of the radius was also displaced more or less upwardsfrom its original socket, a new socket, Sir Astley himself informsus, having been formed for its reception, upon the external this is the only example, the actual condition of which has beenproven by an autopsy. Nevertheless, it seems probable that a simple luxation or subluxa-tion of the ulna backwards may occur without either of the above-Fig. Dislocation of the upper end of the ulna backwards. mentioned complications, and that, to the extent of a few lines, it maybe made to pass upwards upon the back of the humerus, by the 1 Parker, New York Journ. Med., March, 1852, p. 189. 588 DISLOCATIONS OF THE RADIUS AND ULNA. falling of the forearm to the ulnar side; in which case the characterof the accident would probably be recognized by the projection ofthe olecranon process, while the head of the radius might be feltmoving in its socket—by the partial flexion and complete pronationof the forearm, and by the general immobility of the joint. In a casereported by Dr. Waterman, caused by a fall on the hand, the arm wasat a right angle, and Its reduction ought to be accomplished easily, one would think, bythe same measures which have been found successful in reducing adislocation of both bones backwards; but in Watermans case thismethod failed, and the reduction was pr
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