{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T11:14:31Z","timestamp":1791285271726,"version":"4.1.0"},"reference-count":36,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T00:00:00Z","timestamp":1631404800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T00:00:00Z","timestamp":1631404800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["BMC Musculoskelet Disord"],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec>\n                <jats:title>Background<\/jats:title>\n                <jats:p>No studies have directly evaluated kinematic changes during squatting before and after bicruciate-stabilized total knee arthroplasty (BCS-TKA) with the dual cam-post mechanism and asymmetric surfaces. This study investigated the effect of BCS-TKA on changes to pre- and postoperative skeletal knee kinematics, to identify factors associated with postoperative skeletal kinematic parameters.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Seventeen knees in 17 patients were prospectively recruited before primary TKA for advanced medial knee osteoarthritis. Subjects underwent BCS-TKA and were evaluated more than 1 year postoperatively. In vivo dynamic skeletal knee kinematics were evaluated using periodic radiographic images collected during squatting to quantify the tibiofemoral functional extension\/flexion angle, anteroposterior (AP) translation, and axial rotation angle using image-matching techniques. Rotational alignments of femoral and tibial components were measured postoperatively using computed tomography images.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>The pre- and postoperative tibiofemoral functional extension\/flexion angles during squatting were 12.2\u00b0 \u00b1 6.7\u00b0\/100.1\u00b0 \u00b1 16.8\u00b0 and 9.6\u00b0 \u00b1 8.6\u00b0\/109.4\u00b0 \u00b1 16.8\u00b0, respectively, with a significant difference in flexion angle (<jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05). Total AP translation was significantly larger postoperatively than preoperatively (10.8 mm\u2009\u00b1\u20093.7 mm vs. 14.4 mm\u2009\u00b1\u20094.2 mm, respectively; <jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05). The pre- and postoperative total rotation angles were 6.6\u00b0 \u00b1 3.0\u00b0 and 6.4\u00b0 \u00b1 3.7\u00b0, respectively, indicating no significant difference. The pre- and postoperative tibiofemoral functional flexion angles were significantly associated with each other (<jats:italic>p<\/jats:italic>\u2009=\u2009.0434, <jats:italic>r<\/jats:italic>\u2009=\u2009.49). The postoperative total rotation angle was significantly smaller when the total component rotational mismatch angle between the femoral and tibial components was above 5\u00b0 vs. below 5\u00b0 (4.6\u00b0 \u00b1 2.7\u00b0 vs. 8.3\u00b0 \u00b1 3.9\u00b0, respectively; <jats:italic>p<\/jats:italic>\u2009&lt;\u2009.05).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>BCS-TKA significantly increased the tibiofemoral functional flexion angles, with larger AP translation postoperatively. Both preoperative skeletal kinematics and surgical techniques affected the skeletal kinematics of the replaced knee. A total component rotational mismatch angle greater than 5\u00b0 significantly decreased postoperative total knee rotation during squatting.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s12891-021-04669-9","type":"journal-article","created":{"date-parts":[[2021,9,12]],"date-time":"2021-09-12T14:04:01Z","timestamp":1631455441000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Comparison of in vivo knee kinematics before and after bicruciate-stabilized total knee arthroplasty during squatting"],"prefix":"10.1186","volume":"22","author":[{"given":"Masato","family":"Kiyohara","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satoshi","family":"Hamai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirotaka","family":"Gondo","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hidehiko","family":"Higaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Satoru","family":"Ikebe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ken","family":"Okazaki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yasuharu","family":"Nakashima","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2021,9,12]]},"reference":[{"issue":"10","key":"4669_CR1","doi-asserted-by":"publisher","first-page":"2199","DOI":"10.1016\/j.arth.2016.01.043","volume":"31","author":"MA Ritter","year":"2016","unstructured":"Ritter MA, Keating EM, Sueyoshi T, Davis KE, Barrington JW, Emerson RH. 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This study was approved by the Institutional Review Board (IRB) of Kyushu University (IRB numbers 24\u2013166 and 28\u2013375). The subjects were given informed consent to participate in this IRB approved study and was informed of the risk of radiation exposure required.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethics approval and consent to participate"}},{"value":"Not applicable.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Consent for publication"}},{"value":"The authors declare that they have no competing interests.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"772"}}