(a) Histological section of cartilage repair tissue within the knee joint of a minipig model 6 months after treatment by MFX. The repair tissue is characterized by excessive outgrowth of the subchondral bone tissue and overlying fibrocartilaginous tissue.
(b) High magnification of the repair tissue in a minipig model 6 weeks following MFX. Repair cells of deeper zones differentiate into hypertrophic chondrocytes prior to be replaced by endochondral ossification (Toluidin blue staining).
Figure 1: Chondrocyte hypertrophy and excessive bone formation following MFX in an experimental model.