Osteophyte formation on medial wall of the intercondylar notch of femur is an early sign of osteoarthritic knee development using osteoarthritis initiative data. (April 2017) - Sasho, T.; Akagi, R.; Tahara, M.; Katsuragi, J.; Nakagawa, R.; Enomoto, T.; Yusuke, S.; Kimura, S.; Yamaguchi, S.; Watanabe, A.