• Shigeyuki Muraki, Toru Akune, Masatoshi Teraguchi, Ryohei Kagotani, Yoshiki Asai, Munehito Yoshida, Fumiaki Tokimura, Sakae Tanaka, Hiroyuki Oka, Hiroshi Kawaguchi, Kozo Nakamura, and Noriko Yoshimura.
• Department of Clinical Motor System Medicine, 22nd Century Medical & Research Center, Faculty of Medicine, the University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo, 113-8655, Japan. murakis-ort@h.u-tokyo.ac.jp.
• Bmc Musculoskel Dis. 2015 Oct 16; 16: 305.

BackgroundThe objective of this study was to clarify the association of quadriceps muscle strength with knee pain using a large-scale, population-based cohort of the Research on Osteoarthritis/osteoporosis Against Disability (ROAD) study.MethodsFrom the 2566 subjects at the third visit of the ROAD study, the present study analyzed 2152 subjects who completed radiographic examinations and measurements of muscle strength and mass (690 men and 1462 women; mean age, 71.6 ± 12.2 years). Knee pain was assessed by an experienced orthopedist. Knee osteoarthritis (OA) was defined according to Kellgren-Lawrence (KL) grade. Quadriceps muscle strength and muscle mass at the lower limbs were measured by the Quadriceps Training Machine (QTM-05F, Alcare Co., Ltd. Tokyo, Japan) and the Body Composition Analyzer MC-190 (Tanita Corp., Tokyo, Japan), respectively.ResultsQuadriceps muscle strength and weight bearing index (WBI: quadriceps muscle strength by weight) were significantly associated with knee pain after adjustment for age and body mass index, whereas grip strength and muscle mass at the lower limbs were not. The significant association of quadriceps muscle strength with knee pain was independent of radiographic knee OA.ConclusionThe present cross-sectional study showed an independent association of quadriceps muscle strength with knee pain.

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