Fig.3 Time of HOPX formation and other osteophytes

The total number of osteophytes in the knee joint after arthroscopic surgery in cases with HOPOX-positive knees (n＝16) . The circles indicate HOPOX. In 13 knees, HOPOX was the first and only osteophyte when a single osteophyte was observed, whereas in the other three knees, HOPOX was co-observed with osteophytes at other sites.