{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,15]],"date-time":"2026-10-15T16:50:32Z","timestamp":1792083032574,"version":"4.4.0"},"reference-count":27,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T00:00:00Z","timestamp":1789948800000},"content-version":"vor","delay-in-days":82,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,7,1]],"date-time":"2026-07-01T00:00:00Z","timestamp":1782864000000},"content-version":"tdm","delay-in-days":0,"URL":"http:\/\/doi.wiley.com\/10.1002\/tdm_license_1.1"}],"content-domain":{"domain":["esskajournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["J. exp. orthop."],"published-print":{"date-parts":[[2026,7]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>The specific kinematics relevant to sports activities after unicompartmental knee arthroplasty (UKA) remain unclear. We aimed to clarify the kinematic factors associated with sports activities after UKA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      Twenty\u2010five knees that had undergone UKA were examined fluoroscopically during squatting (weight\u2010bearing [WB]) and active\u2010assisted knee flexion (non\u2010weight\u2010bearing [NWB]). Patients who were able to perform deep squatting were included. A two\u2010dimensional\/three\u2010dimensional registration technique was used to evaluate tibiofemoral kinematics, including flexion angle, axial rotation angle, varus\u2013valgus angle, and anteroposterior translation (APT) of the femur relative to the tibia. Patients were divided into two groups using hierarchical cluster analysis based on 1\u2010year postoperative sports scores from the Knee Injury and Osteoarthritis Outcome Score and the 2011 Knee Society Score (low\u2010to\u2010moderate score group [\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200915] and high score group [\n                      <jats:italic>n<\/jats:italic>\n                      \u2009=\u200910]).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The sports subscale Knee Injury and Osteoarthritis Outcome Scores, except for jumping, were significantly higher in the high\u2010score group than in the low\u2010score group. During WB, the flexion angle was significantly greater in the high\u2010score group (136.2\u2009\u00b1\u20098.5\u00b0) than in the low\u2010score group (126.3\u2009\u00b1\u200914.2\u00b0). In contrast, no significant difference in flexion angle was observed during NWB. Regarding lateral APT, the high\u2010score group showed a more posterior position than the low\u2010score group throughout the flexion range during WB. No significant between\u2010group differences were observed in terms of axial rotation, varus\u2013valgus angle, or medial APT.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The ability to achieve greater flexion during weight\u2010bearing activities is an important factor for sports performance after UKA.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level III.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/jeo2.70918","type":"journal-article","created":{"date-parts":[[2026,9,21]],"date-time":"2026-09-21T16:45:45Z","timestamp":1790009145000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["In vivo three\u2010dimensional kinematics in unicompartmental knee arthroplasty: A sports activity cluster analysis"],"prefix":"10.1002","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8033-2037","authenticated-orcid":false,"given":"Kenichi","family":"Kono","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery Faculty of Medicine, The University of Tokyo Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ryota","family":"Yamagami","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery Faculty of Medicine, The University of Tokyo Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kohei","family":"Kawaguchi","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery Faculty of Medicine, The University of Tokyo Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hiroshi","family":"Inui","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery Faculty of Medicine, Saitama Medical Center Saitama Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuji","family":"Taketomi","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery Faculty of Medicine, The University of Tokyo Tokyo Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takaharu","family":"Yamazaki","sequence":"additional","affiliation":[{"name":"Department of Informatics Faculty of Informatics, Shonan Institute of Technology Kanagawa Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tetsuya","family":"Tomita","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Biomaterial Science Osaka University Graduate School of Medicine Osaka Japan"},{"name":"Department of Medical Science Graduate School of Medicine, Morinomiya University of Medical Sciences Osaka Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sakae","family":"Tanaka","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery Faculty of Medicine, The University of Tokyo Tokyo 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