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This study aimed to investigate the effects of different levels of ACL injuries on knee stability and ACL tensional force to identify the critical injury level. Motion data of five normal subjects were acquired along with the ground reaction force. A knee model with 14 ligaments was developed using cadaveric specimen data. The initial length and stiffness of the ACL were changed to develop ACL-injured knee models. Musculoskeletal simulations of the knee models were performed using the measured gait data. The average tibial anterior translation increased significantly by 2.6\u2009\u00b1\u20090.7\u2009mm when the ACL stiffness decreased to 25% of its original stiffness. The average tibial anterior translation increased significantly by 2.6\u2009\u00b1\u20090.3\u2009mm at an increase in initial length of 10%. The knee with partial ACL tear had a nonlinear decrease in ACL forces owing to the increase in the level of ACL injury, while the knee with ACL lengthening had linear decreased ACL forces. The partial tear of the ACL caused translational instability, while the complete tear caused both rotational and translational instabilities during the musculoskeletal walking simulation. This study presents the effects of partial ACL injuries on joint kinematics and ACL tensional force during the dynamic motion of walking.<\/jats:p>","DOI":"10.1115\/1.4054982","type":"journal-article","created":{"date-parts":[[2022,7,15]],"date-time":"2022-07-15T12:33:41Z","timestamp":1657888421000},"update-policy":"https:\/\/doi.org\/10.1115\/crossmarkpolicy-asme","source":"Crossref","is-referenced-by-count":4,"title":["Influences of Partial Anterior Cruciate Ligament Injury on Anterior Cruciate Ligament Tensional Force and Kinematic Stability During Walking"],"prefix":"10.1115","volume":"145","author":[{"given":"Young-Jun","family":"Koo","sequence":"first","affiliation":[{"name":"Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology , Daejeon 34141, South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jong Keun","family":"Seon","sequence":"additional","affiliation":[{"name":"Department of Orthopedic Surgery, Chonnam National University, Bitgoeul Hospital , Gwangju 61748, South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Giuk","family":"Lee","sequence":"additional","affiliation":[{"name":"School of Mechanical Engineering, Chung-Ang University , Seoul 06974, South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seungbum","family":"Koo","sequence":"additional","affiliation":[{"name":"Department of Mechanical Engineering, Korea Advanced Institute of Science and Technology , 291 Daehak-ro, Yuseong-gu, Daejeon 34141, South Korea"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"33","published-online":{"date-parts":[[2022,8,19]]},"reference":[{"issue":"2","key":"2022081916580386300_bib1","doi-asserted-by":"crossref","first-page":"252","DOI":"10.5312\/wjo.v6.i2.252","article-title":"Review of Evolution of Tunnel Position in Anterior Cruciate Ligament Reconstruction","volume":"6","year":"2015","journal-title":"World J. 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