Arthritis Deformans of Elbow -Joint. 505 



Ulna. — Left elbow-joint, with the muscles cleaned off — in 

 spirit, section removed from the inner side, illustrating the 

 above. 



There has been firm anchylosis of the elbow. The lower 

 end of the humerus is enlarged, and the ulna even more so, and 

 the irregularities have interlocked. Fibrous tissue intervenes 

 between the articular surfaces at most places. What was 

 formerly the capitellum is now an irregular hollow on the outer 

 side of the humerus, with a margin of new bone round it. The 

 head of the radius is greatly enlarged, and has the appearance 

 of having been shifted bodily outwards. Its articular surface, 

 like that of the humerus, is smooth and eburnated, while round 

 about it shows the usual irregularity. The broken ends of the 

 ulna are surrounded by a capsule, and there is the cavity of a 

 false joint between them. A quantity of fibrous tissue at the 

 back unites the fragments to one another and to the adjacent 

 part of the radius. G. C. 3069. 



Presented hy William Russell, M.D. 



7. 196. Arthritis Deformans of the Elbow with an 

 Ununited Fracture of the Upper End of the Ulna.— 



Macerated section of the humerus and ulna from the fore- 

 going specimen, showing the interlocking of the altered 

 articular surfaces. G. C. 3069, 



Presented hy William Russell, M.D. 



7. 197. Anchylosis after Old-standing- Arthritis De- 

 formans. — Adjacent portions of a right humerus and ulna — 

 macerated, illustrating the above. 



While the anchylosis is osseous and complete at the back, 

 there is a furrow of separation on the front. The lower end of 

 the humerus seems to have been partially absorbed, while the 

 upper end of the ulna has become enlarged on the front and 



