496 Diseases of Joints. 



vertical transverse section of a left femur and adjacent part of 

 pelvis — macerated, illustrating the above. 



The limb has evidently been fixed in a strongly adducted 

 position, for the lesser trochanter has been atrophied by pressure 

 against the lower part of the acetabulum. This is evident when 

 the bones are placed in situ. They have, however, been 

 mounted separately, to show the condition of the articular 

 surfaces. There is some enlargement round the head of the 

 bone, and considerable absorption on its top and inner sides. 

 The surfaces of the femur and acetabulum which were in close 

 contact are very porous, and have little or no eburnation, pro- 

 bably because only limited movement was permitted by the 

 altered shape of the bones. There is considerable roughening at 

 the point of attachment of the quadratus femoris to the femur. 

 The acetabulum shows the usual irregular enlargement round 

 the margin, with a facette at the front of the cotyloid notch, 

 where it was pressed upon by the lesser trochanter. The section 

 shows some condensation of the head and neck of the femur, 

 with a small cavity near the articular margin above. 



G. C. 921a. 



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



7. 180. Advanced Arthritis Deformans. — Anterior half of the 

 vertical transverse section of the previous specimen — in spirit. 



It will be noted that there is a distinct thick layer of 

 cartilage on what, in the macerated specimen, seems to be an 

 enlargement downwards of the head. 



The presence of cartilage upon this piece of bone, so 

 far removed in position from that of any part of the original 

 head, can only be accounted for in one or other of two ways. 

 Either this is a new layer of cartilage which has formed upon 

 new bone, or it is some uf the original cartilage adhering to a 

 portion of the original head of the bone, which has been 

 displaced bodily downwards. As articular cartilage is seldom. 



