Arthritis Deformans of jElhow -joint. 503 



ELBOW JOINT. 



7. 191. Advancing" Arthritis Deformans. — Lower end of a 



right humerus, with the muscles dissected off — in spirit, illus- 

 trating the above. 



The articular surface on the lower part of the capitellum 

 is bared of cartilage and smooth. There is also some bony 

 outgrowth at the margins of the trochlear surface. An 

 adimentary bone about the size of a large pea is seen in the 

 olecranon fossa, and must have interfered with the extension 

 of the joint. G. C. 1194. 



Fresentcd by Adam Hunter, F.R.C.S.E. 



7. 192. Advanced Arthritis Deformans.— Bones of a left 



elbow-joint, with the muscles and synovial membrane dissected 

 away — in spirit, illustrating the above. 



There is considerable atrophy on the inner side of the 

 trochlea, and the articular surface has thus the appearance of 

 being tilted up, so as to bring the inner side higher than the 

 outer. The cartilage has been worn off the articular surfaces, 

 and the trochlear surface, now covered by smooth bone, is 

 marked by deep grooves. The head of the radius is greatly 

 enlarged all round, while its cartilage is partially eroded. The 

 coronoid and olecranon fossae are shallow, but a new depres- 

 sion has been formed above the capitellum for the enlarged 

 head of the radius. The articular margins of the humerus and 

 ulna are enlarged, and one adimentary bone is seen on the 

 coronoid process of the ulna, and another on the back of the 

 trochlear surface. G. C. 3246. 



Presentcdhy Charles W. Cathcart, F.R.C.S.E. 



7. 193. Much Advanced Arthritis Deformans. — Bones of a 

 right elbow, muscles cleaned off — in spirit, illustrating the 

 above. 



The joint has been opened, and the humerus rotated 



