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Japanese Orthopaedic Association score. *Group 50s versus group 70s, group 50s versus group 80s: p < 0.0083. **Group 50s versus group 70s, group 50s versus group 80s, group 60s versus group 70s, group 60s versus group 80s: p < 0.0083. #Group 50s versus group 70s, group 50s versus group 80s, group 60s versus group 70s: p < 0.0083. ##Group 50s versus group 80s, group 60s versus group 70s, group 60s versus group 80s: p < 0.0083.
