192 Injuries of Joints. 



— Left scapula, with adjacent parts of clavicle and humerus 

 — in spirit, showing the above. 



The inner margin of the glenoid cavity of the scapula is 

 worn away, and the adjacent bone on the ventral surface is flat 

 and smooth. 



The greater part of the articular surface of the humerus is 

 irregular, and covered by fibrous material. At the back of the 

 greater tuberosity, the bone has been smoothed down by 

 friction against the scapula, and near it there is a projecting 

 spur of bone. Portion of a strong fibrous capsule is seen on 

 the inner side of the head of the humerus. The bone forming 

 the infra-spinatus fossa has been fractured, and has united with 

 great irregularity. B. C. ii. M. 44. 



5. 4. Unreduced Sub-coraeoid Dislocation of the Shoulder. 



— Eight scapula and humerus — macerated, showing the above. 



The specimen is from the same patient as the last. 



Evidently on this side also there has been an unreduced 

 dislocation. The original glenoid cavity is partly filled up by 

 newly formed bone, and a new cavity has been formed inside, 

 and below the level of the first one. The head of the humerus 

 shows many alterations. The greater and lesser tuberosities 

 have atrophied, and their surfaces pass insensibly into those of 

 the shaft and head respectively. The articular surface of the 

 head is irregular, and a mass of new bone has been thrown out 

 at the outer and back part of the surgical neck. The surface of 

 this new piece is porous, and the intervals between the small 

 holes are at places eburnated. This condition resembles that 

 often produced by arthritis deformans upon the head of the 

 femur. B. C. ii. M. 45. 



5. 5. Old-standing Sub-coracoid Dislocation of the 



Shoulder. — Right scapula, with adjacent portions of the 

 humerus and clavicle, from a person aged 76 years. 



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