Tuhcrcular Synovitis of Knee-joint. 447 



A small portion of the outer articular surface alone remains, 

 the rest of the upper surface of the bone is eroded and rarefied. 

 There is a deep excavation Avith a septum at the bottom of it 

 on the front of the inner articiilar surface, and a small excava- 

 tion behind it. The altered portion of the outer articular 

 surface has the appearance of newly-formed processes of 

 bone filling up a cavity such as exists on the other side. 

 A considerable amount of new bone has been thrown out 

 round the tuberosities below the articular surfaces. 



F. P. C. 779. 



7. 54. Invasion of Articular Surfaces from Tubercular 



Synovitis. — Upper end of a right tibia, Avith very deep 

 erosions. 



Large and deep rounded cavities are seen on both sides of 

 the inner and on the front of the outer articular surfaces, the 

 largest being that on the posterior part of the inner tuberosity, 

 Avhere there is a rounded depression large enough to lodge the 

 end of a man's middle finger. There is little or no new periosteal 

 bone formed round the tuberosities. F. P. C. 780. 



7. 55. Invasion of Articular Surfaces from Tubercular 



Synovitis. — Upper end of a right tibia, showing very deep 

 erosions. 



There are very large and deep excavations upon the inner 

 condyle, especially towards the back. One extends down into 

 the bone for about three-quarters of an inch. Little or no new 

 bone is formed round the tuberosities. F. P. C. 774. 



7. 56. Invasion of Articular Surfaces from Tubercular 



Synovitis. — Lower half of a right femur, Avith the patella 



and upper end of tibia, showing very deep erosions on the tibia. 



"The patient in this case was a young man about 18 years of age, 



and before his admission into' the Hospital had suffered much. His 



