Tubercular Ostitis involving AnMc-joint. 471 



astragalus has its upper and lateral articular surfaces rarefied 

 and partially absorbed. F. P. C 802. 



PreseiUed ly Professor John Thomson. 



h. Changes primarily or chiefly in the bone. 



7. 116. Tubercular Arthritis, involving' the Tibia and 



Fibula. — Half of the lower end of a right tibia and corre- 

 sponding part of fibula — macerated, illustrating the above. 

 The changes were said to be due to " scrofulous caries." 

 Both bones are enlarged, and their articular siirfaces are 

 irregular. The interior of the tibia is partly occupied by 

 adipocere. (A left astragalus was formerly mounted along with 

 the above bones, but as it shows nothing of importance, it has- 

 been discarded.) F. P. C. 803. 

 Presented hy Professor James Russell. 



7. 117. Tubercular Arthritis, involvings the Bones at the 



Ankle- Joint and the Os Calcis. — Lower ends of the tibia 

 and fibula of a boy, with remains of the os calcis and astragalus 

 — macerated and in spirit. 



Amputation was performed. 



The bones are lightened and considerably altered in shape,, 

 but the adipocere formed during maceration masks their 

 condition. G. C. 2169. 



Presented by Benjamin Bell, Junr., F.R.C.S.E., 1840. 



7. 118. Tubercular Arthritis, involving- the Tibia.— Lower 



end of a right tibia — macerated, illustrating the above. 



Except at one small place on the outer side, the articular 

 plate of the bone is removed, leaving the surface below rough 

 and irregular. At the back, above the articular surface, but 

 extending downwards into it, there is a large cavity, with 



