Fig. 5

Gross morphology of subchondral bone and cartilage of the groups. Subchondral bone in the FNF group appeared to be compact and integrated. Destruction of trabecular bone was seen in the OA group, but the structure of trabecular bone arrangement was still reserved. In the ONFH group, the destruction of subchondral bone was severest, and the arrangement of trabecular bone appeared to be structureless. Cartilage in the FNF group was thicker, while it was thinner in the OA group with part of region destroyed. Cartilage in the ONFH group was thinnest and the damage was severest. Bar = 5 mm