Figure 6

Histopathological findings. Many smaller loose bodies were excised at the same time (Figure 6 A). Histopathological findings showed that the loose bodies were almost completely covered with synovial membrane. The loose bodies were cartilaginous, and cartilaginous metaplasia was observed in the area where the synovial membrane covered the loose body (Figure 6 B, D). The cartilage showed proliferative activity with large pleomorphic nuclei, which tended to be arranged in small bunches. Furthermore, ossification was partially found in the loose body (Figure 6 C).