68 LAMENESS OF THE HORSE 



a glenoid cavity, scapulohumeral luxations are very rare in the 

 horse. According to Moller^, luxation is generally due to exces- 

 sive flexion of the scapulohumeral joint. In such cases the head 

 of the humerus is displaced anterior to the articular portion of 

 the scapula and remains so fixed. 



Symptoms. — Complete luxation of the scapula is recognized 

 because of innnobility of the scapulohumeral joint and of the 

 abnormal position of the head of the humerus, which can be rec- 

 ognized by palpation, unless the swelling be excessive. Immo- 

 bility of the scapulohumeral joint is noticeable when one attempts 

 to passively move the parts. 



Treatment. — Reduction of the luxation is effected by mak- 

 ing use of the same general principles that are employed in the 

 reduction of all luxations, and they are — the control of the ani- 

 mal so that the manipulations of the operator are not antagon- 

 ized by muscular contraction, which is best accomplished by 

 anesthesia; placing the luxated bones in the position which they 

 have taken to become unjointed ; and then making use of force 

 which is directed in a manner opposite to that which has effected 

 the luxation. 



In a forward luxation of this kind, the operator should further 

 flex the humerus, and while it is in this flexed position, force is 

 exerted upon the articular head of this bone, and it is pushed 

 downward and backward into its normal position. 



After-care consists in restriction of exercise and, if necessary, 

 confining the subject in a sling and the application of a vesicant 

 over the scapulohumeral region. 



Inflsunmation of the Bicipital Bursa. 

 ( Bursitis Intertuberculeuis. ) 



Anatomy. — There is interposed between the tendon of the 

 biceps brachii (flexor brachii) and the intertubercular or bicipi- 

 tal groove a heavy cartilaginous pad, which is a part of the bursa 

 of the biceps brachii. This synovial bursa forms a smooth groove 

 through wliicli tlie l)ieeps braelni glides in the anterior scapulo- 



'Regional Veterinary Surgery and Operative Technique, .Tno. A. W. Dollar, 

 M. R. C. V. S., F. R. S. E., M. R. I., page 765. 



