The practice of surgery . elt and seen projecting on the coracoid is beset with no difficulty ; in fact, the manipulation requiredfor diagnosis generally succeeds in effecting replacement. The acci-dent is rare. 5. Subluxation upwards, with displacement of the long head of thebiceps.—The long tendon of this muscle may be displaced from thebicipital groove, and laid over the lesser tubercle. In consequence, thehead of the humerus escapes upwards, coming into immediate contactwith the acromion. The accident is obscure, and probably rare. It isnoted by loss of power in the bicep
The practice of surgery . elt and seen projecting on the coracoid is beset with no difficulty ; in fact, the manipulation requiredfor diagnosis generally succeeds in effecting replacement. The acci-dent is rare. 5. Subluxation upwards, with displacement of the long head of thebiceps.—The long tendon of this muscle may be displaced from thebicipital groove, and laid over the lesser tubercle. In consequence, thehead of the humerus escapes upwards, coming into immediate contactwith the acromion. The accident is obscure, and probably rare. It isnoted by loss of power in the biceps, by pain in the seat of injury, andby the peculiar deformity attendant on the upward displacement of thehead of the bone. Reduction is effected by a coaptating manipulation,directed to the tendon, during flexion of the forearm. Dislocation of the Radius and Ulna at the Elbow. 1. Backwards.—Both bones of the forearm are not unfrequentlydisplaced backwards, without fracture of any part, by falls on the hand, Tig. Dislocation of both Bonos backwards. with the elbow in a state of semiflexion. The joint is much deformed,and has its motion greatly abridged. The hand and forearm arc supine ; 328 DISLOCATION OF THE ULNA. 152. the joint is bent nearly at a right angle, and can be neither completelyflexed nor extended. The ulna and radius form a very marked pro-jection posteriorly, and, on examination, the olecranon is found on ahigher level than the external condyle of the humerus. The coronoidprocess of the ulna rests in the cavity which ought to receive the ole-cranon ; and on each side of the olecranon a hollow is caused, byabsence of the lower part of the triceps from its wonted locality. Thetrochlea of the humerus, projecting forwards, forms a hard swellingbehind the tendon of the biceps. Reduction may be effected in two ways. a. By extension, with co-aptation, from behind. This is the preferable mode. The patient isplaced with his back to the surgeon, and the chesthavi
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