REGION OF THE ELBOW. 



293 



the bones locked in their displaced position. The coronoid process prevents the 

 humerus from going back into place. To reduce the dislocation, the triceps is to be 



FIG. 305. Posterior luxation of the elbow, showing the FIG. 306. Posterior luxation of the elbow, showing the 



position of the bones as viewed from the outer side. position of the bones as viewed from the inner side. 



relaxed by extending the forearm to an angle of about 120 degrees, thus lowering 

 the coronoid process, and extension is to be made on the forearm and counterexten- 

 sion on the arm. Usually an anaesthetic is not required (Fig. 307). 



Inward Dislocation of the Elbow. In inward dislocation the ulna and 



Median nerve 



Brachialis anticus 



Tendon of triceps 

 Ulnar nerve 



Olecranon process 



Corcnoid process 

 FIG. 307. Dissected preparation of posterior luxation of the elbow, viewed from the inner side. 



radius are pushed toward the inner side. The head of the radius leaves the capi- 

 tellum to rest on the adjacent portion of the trochlea. The olecranon slides from the 



