480 Diseases of Joints. 



Plaster of Paris cast of a left elbow-joint and forearm — after 

 amputation, illustrating the above. 



The joint is much swollen, and a large unhealthy ulcer 

 covers its outer and back part. F. P. C. 2882. 



7. 141. Tubercular Disease of the Elbow, affecting- 

 chiefly the Humerus and Ulna.— Lower end of a left 



humerus — with ulna and radius — macerated, illustrating the 

 above. 



" From a boy, aged 8, who had received a slight injury on the elbow. 

 He got into the hands of an ignorant person, calling himself a bone-setter. 

 The violence which this person at repeated intervals used, in order to 

 reduce a supposed dislocation of the joint, no doubt gave rise to the 

 scrofulous caries in the bone, and which is finely displayed in this pre- 

 paration." 



The tipper end of the ulna is much enlarged by 

 new growth on the surface, and a piece of bone, forming 

 apparently the original articular surface, has necrosed, and has 

 been in process of separation, for the adjoining bone is 

 separated from it by a groove. The upper end of the radius is 

 slightly enlarged by neAV bone growth on the surface, and the 

 epiphysis has disappeared. The humerus is likewise enlarged 

 above the articular end by new periosteal bone formation. The 

 epiphysis on the radial side alone remains. G. C. 735. 



Presented hy James Pitcairn, F.R.C.S.E., 1825. 



7. 142. Tubercular Arthritis, with Extensive Chang-es in 

 the Adjacent Bones.— Bones of the left fore-arm and 

 lower end of humerus of a child — macerated, showing great 

 changes in the humerus and ulna, but not in the radius. 



The ulna is enormously thickened in its upper half. The 

 enlargement is tunnelled by rounded channels, which open at 

 the articular surface, at the back, and at the outer side. The 

 articular surface is so altered as to be scarcely recognisable. 

 The lower end of the humerus presents similar changes, but 



