Tuhercular Synovitis of Knee-joint. 435 



7. 24. Tubercular Synovitis destroying Cartilage.— Lower 



■ end of a right femur and patella removed by excision — in spirit. 

 The articular surface of the femur is greatly altered. At 

 the margins of the trochlear surface, and at the site of the 

 ligamenta alaria, the cartilage is replaced by the encroaching 

 synovial membrane, which has spread over it. Upon the front 

 of the trochlear surface, and upon the under surface of the 

 inner and slightly also of the outer condyle, the cartilage has 

 been undermined, and lies in loose flakes and tags. 



The cartilaginous su.rface of the patella has also suffered 

 both from the encroachment and the undermining forms of 

 invasion. G. C' 2843. 



Frcsentecl by Professor T. Annandale. 



7. 25. Tubercular Synovitis, with Peri-articular Abscess. — 



Right knee-joint injected with vermilion, and laid open — in 

 spirit, illustrating changes chiefly in the outlying portions of 

 the synovial membrane. 



The upper and inner part of the trochlear surface of the 

 femur shows the gradual growth upon it of the vascular 

 synovial membrane, but the rest of the articular surface of the 

 femur is comparatively unchanged, except for a narrow band 

 of vascularity between the outer condyle and the trochlear 

 surface. The upper part of the synovial membrane has been 

 much affected. It has been caseous, and at the inner side has 

 broken down, to form a tubercular abscess, which has burrowed 

 under the vastus internus, and is now seen to contain the curdy 

 and flocculent material, characteristic of tubercular abscesses. 



G. C. 198. 

 Presented by Professor John Thomson. 



7. 26. Tubercular Synovitis, with Abscesses bursting* into 



