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The contributions of muscle atrophy and failure of voluntary muscle activation. J Bone            Joint Surg Am, 2005, 87: 1047\u20131053.","DOI":"10.2106\/JBJS.D.01992"},{"key":"5","doi-asserted-by":"crossref","unstructured":"5) Stevens              JE, Mizner              RL, Snyder-Mackler              L: Quadriceps strength and volitional activation before and after            total knee arthroplasty for osteoarthritis. J Orthop Res, 2003, 21:            775\u2013779.","DOI":"10.1016\/S0736-0266(03)00052-4"},{"key":"6","doi-asserted-by":"crossref","unstructured":"6) Singla              R, Niederer              D, Franz              A, et al.: The course of knee extensor strength            after total knee arthroplasty: a systematic review with meta-analysis and -regression. 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J Orthop Sports Phys Ther, 1991, 13:            191\u2013198.","DOI":"10.2519\/jospt.1991.13.4.191"},{"key":"9","doi-asserted-by":"crossref","unstructured":"9) Kelln              BM, McKeon              PO, Gontkof              LM, et al.: Hand-held dynamometry: reliability of            lower extremity muscle testing in healthy, physically active, young adults. J Sport Rehabil,            2008, 17: 160\u2013170.","DOI":"10.1123\/jsr.17.2.160"},{"key":"10","doi-asserted-by":"crossref","unstructured":"10) Narumi              K, Funaki              Y, Yoshimura              N, et al.: Quadriceps muscle strength reference            value as index for functional deterioration of locomotive organs: data from 3617 men and women in Japan. J Orthop            Sci, 2017, 22: 765\u2013770.","DOI":"10.1016\/j.jos.2017.03.012"},{"key":"11","doi-asserted-by":"crossref","unstructured":"11) Nawata              A, Koga              H, Sasaki              R, et al.: Accuracy of a portable lower-limb muscle            strength measuring device with a training function. J Phys Ther Sci, 2024,            36: 343\u2013351.","DOI":"10.1589\/jpts.36.343"},{"key":"12","doi-asserted-by":"crossref","unstructured":"12) Omori              G, Koga              Y, Tanaka              M, et al.: Quadriceps muscle strength and its            relationship to radiographic knee osteoarthritis in Japanese elderly. J Orthop Sci, 2013,            18: 536\u2013542.","DOI":"10.1007\/s00776-013-0383-4"},{"key":"13","doi-asserted-by":"publisher","unstructured":"13) Miura              K, Fujino              Y, Takahashi              Y, et al.: Reliability of the knee extensor muscle            strength of healthy subjects. 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