438 . Diseases of Joints. 



inner condyle a thin layer of gray granulations just covered 

 the bone. 



The cast therefore illustrates removal of articular cartilage, 

 and substitution of vascular granulations in its place. These 

 may (1) develop on into bone (osseous anchylosis); or (2) into 

 fibrous tissue (as in this case at certain parts, where it formed a 

 fibrous covering for the articular surface) ; (3) break down intO' 

 suppuration ; or (4) continue to invade the bone. 



In this case the fibrous tissue covering part of the condyles 

 was the eff'ect of the organisation of granulations formed at 

 previous attacks. In places the granulations were recent. 



G. C. 2789. a. 

 Presented by Jony Duncan, F.R.C.S.E. 



7. 31. Tubercular Synovitis of the Knee-joint, with 

 Destruction of the Articular Surfaces. — Inner half of 



the knee from which the foregoing casts were taken — in 

 spirit. 



The destruction of cartilage and its replacement by gran- 

 ulation and fibrous tissue— now indistinguishable from the 

 blanching and shrivelling of the spirit — are well shown. The 

 bone on the line of section is quite sound. G. C. 2789. b. 

 Frcsented &?/ Joux Duncan, F.R.C.S.E. 



7. 32. Tubercular Synovitis of the Knee-joint, with 

 Destruction of the Articular Surfaces.— Outer half of 



the same knee-joint — macerated, to show the condition of the 

 bone. 



The articular surface of the femur has at several places 

 lost its firm, bony shell, and the cancellous tissue is exposed. 

 A simikir change is seen on the articular surface of the patella 

 and femur. The adjacent texture of the bone is atrophied and 

 licrht. G. C. 2789. c. 



