{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,21]],"date-time":"2026-05-21T02:10:55Z","timestamp":1779329455083,"version":"3.51.4"},"reference-count":47,"publisher":"Human Kinetics","issue":"1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2023,1,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Context<\/jats:bold>:<\/jats:italic> Deficits in knee extension strength after anterior cruciate ligament reconstruction have been a major problem. The inadequate recovery of the knee extension strength of surgical limb reportedly delays return to sports and increases reinjury risk. Accordingly, the early detection of knee extension strength deficits after reconstruction may help plan early interventions to manage impairment. This study aimed to clarify the association between knee extension strength at 3 and 6\u00a0months after anterior cruciate ligament reconstruction. <jats:italic><jats:bold>Design<\/jats:bold>:<\/jats:italic> Retrospective study. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Fifty patients who underwent primary anterior cruciate ligament reconstruction using hamstring grafts were included. At 3\u00a0months postoperatively, the limb symmetry index (LSI) of isokinetic knee extension strength (IKE) at 60\u00b0\/s, degree of swelling, passive range of motion of knee flexion and extension, and anterior leg reach distance were measured. At 6 months postoperatively, the LSI of IKE was measured at 60\u00b0\/s, which was used as the main outcome. A correlation analysis was performed with the LSI of IKE at 6\u00a0months postoperatively as the dependent variable and the LSI of IKE at 3\u00a0months postoperatively as the independent variable. Subsequently, a multiple regression analysis was performed, with LSI of IKE at 6\u00a0months postoperatively as the dependent variable; LSI of IKE at 3\u00a0months postoperatively as the independent variable; and other variables, demographic information, and surgical data as covariates. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> The correlation analysis revealed that the LSIs of IKE at 3 and 6\u00a0months postoperatively were correlated (<jats:italic>r<\/jats:italic>\u2009=\u2009.535, <jats:italic>P<\/jats:italic>\u2009&lt;\u2009.001). In the multiple regression analysis, the LSI of IKE at 3\u00a0months postoperatively was significantly associated with that at 6\u00a0months postoperatively, even when other variables were included as covariates (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup>\u2009=\u2009.349, <jats:italic>P<\/jats:italic>\u2009=\u2009.004). <jats:italic><jats:bold>Conclusion<\/jats:bold>:<\/jats:italic> Asymmetry of knee extension strength at 3\u00a0months postoperatively could be more useful than other variables related to knee strength in predicting the asymmetry of knee extension strength at 6\u00a0months postoperatively.<\/jats:p>","DOI":"10.1123\/jsr.2021-0336","type":"journal-article","created":{"date-parts":[[2022,8,4]],"date-time":"2022-08-04T06:42:31Z","timestamp":1659595351000},"page":"76-84","source":"Crossref","is-referenced-by-count":5,"title":["Association Between Knee Extension Strength at 3 and 6\u00a0Months After Anterior Cruciate Ligament Reconstruction"],"prefix":"10.1123","volume":"32","author":[{"given":"Sho","family":"Mitomo","sequence":"first","affiliation":[{"name":"Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Junya","family":"Aizawa","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan"},{"name":"Faculty of Health Science, Department of Physical Therapy, Juntendo University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kenji","family":"Hirohata","sequence":"additional","affiliation":[{"name":"Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shunsuke","family":"Ohji","sequence":"additional","affiliation":[{"name":"Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Takehiro","family":"Ohmi","sequence":"additional","affiliation":[{"name":"Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Toshiyuki","family":"Ohara","sequence":"additional","affiliation":[{"name":"Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hideyuki","family":"Koga","sequence":"additional","affiliation":[{"name":"Department of Joint Surgery and Sports Medicine, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Kazuyoshi","family":"Yagishita","sequence":"additional","affiliation":[{"name":"Clinical Center for Sports Medicine and Sports Dentistry, Tokyo Medical and Dental University, Tokyo, Japan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"issue":"5","key":"r1","series-title":"J Athl Train","doi-asserted-by":"publisher","first-page":"442","DOI":"10.4085\/1062-6050-302-16","article-title":"Clinical outcome measures and return-to-sport timing in adolescent athletes after anterior cruciate ligament reconstruction","volume":"53","author":"Burland JP","year":"2018","unstructured":"Burland JP, Kostyun RO, Kostyun KJ, et\u00a0al. 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