MORBID CONDITION OF CARTILAGE. 



217 



hyaline substance, giving it imnsual softness, and causing it to 

 swell, fibrillate, and split into fibrous bands projecting into the 

 joint. In other cases, the nuclei degenerate into fatty material 



vmC'7\^o:i,^ 



Fig. 40. 



/"¥P,)^H 



J 



liG 41 



Fig. 39. — Cartilage from diseased human patella, showing on the surface 

 fibrous tissue with imbedded cells and nuclei. — (Redfeen.) This figure repre- 

 sents very exactly the commencement of the fibrillation and splitting up of the 

 cartilage, lining the inferior surface of the navicular bone in navicular disease, 

 before adhesion has taken place, between the bone and tendon. 



Fig. 40 shows a more complete formation of bands and fibres upon the 

 surface of the cartilage. ^(Redfekn.) 



Fig. 41. — Vertical .section from the cartilage of the central part of the 

 glenoid cavity of the (human) tibia, showing the splitting into fibres on the 

 surface. — (Redfern.) This appearance of the cartilage represents very fairly 

 the condition of the navicular cartilage when the bone and tendon have be- 

 come adherent. 



