Medial meniscus extrusion was associated with the clinical manifestation of the elderlies aged 70's without knee pain with Kellgren-Lawrence grade 2 of knee osteoarthritis. (April 2017) - Aoki, T.; Liu, L.; Ishijima, M.; Someya, Y.; Kaneko, H.; Sadatsuki, R.; Hada, S.; Yusup, A.; Kinoshita, M.; Arita, H.; Shiozawa, J.; Tamura, Y.; et al.