{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,25]],"date-time":"2026-06-25T03:58:12Z","timestamp":1782359892481,"version":"3.54.5"},"reference-count":27,"publisher":"SAGE Publications","issue":"1","license":[{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"},{"start":{"date-parts":[[2026,1,1]],"date-time":"2026-01-01T00:00:00Z","timestamp":1767225600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["J Orthop Surg (Hong Kong)"],"published-print":{"date-parts":[[2026,1]]},"abstract":"<jats:sec>\n                    <jats:title>Background<\/jats:title>\n                    <jats:p>Restoring native alignment or allowing slight residual varus is often considered optimal in medial unicompartmental knee arthroplasty (UKA). However, it remains unclear whether postoperative alignment remains stable over time and which preoperative factors contribute to varus progression.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>We retrospectively reviewed 126 medial UKAs performed between 2017 and 2022 with a minimum follow-up of 3 years. Standing long-leg radiographs were obtained preoperatively, at 1\u20133 months postoperatively, and at final follow-up. Hip-knee-ankle (HKA), medial proximal tibial angle (MPTA), lateral distal femoral angle (LDFA), and tibial plateau tip-to-proximal tibial shaft (TPTPS) angle were measured. Change in alignment (\u0394HKA) was defined as the difference between final and immediate postoperative HKA. Correlation and multivariate regression analyses were performed to identify predictors of \u0394HKA, and clinical outcomes were analyzed relative to preoperative alignment.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Mean HKA increased from 2.7\u00b0 to 4.2\u00b0 at final follow-up (\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      &lt; 0.001). The proportion of outliers (HKA &gt;5\u00b0) increased from 17% to 39%. \u0394HKA was significantly correlated with preoperative HKA (r = 0.471), MPTA (r = \u22120.388), and TPTPS (r = 0.355) (all\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      &lt; 0.001). In multivariate regression analysis, preoperative HKA, LDFA, and MPTA independently predicted \u0394HKA (R\n                      <jats:sup>2<\/jats:sup>\n                      = 0.295,\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      &lt; 0.001). No association was found between \u0394HKA and clinical outcomes.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Varus progression may occur after medial UKA, particularly in patients with preoperative varus alignment and proximal tibial varus. Surgeons should consider these factors when determining intraoperative alignment targets to avoid excessive residual varus.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/10225536261440619","type":"journal-article","created":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T15:16:20Z","timestamp":1775747780000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":1,"title":["Preoperative proximal tibial varus and varus limb alignment contribute to mid-term varus progression after fixed-bearing medial unicompartmental knee arthroplasty"],"prefix":"10.1177","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9928-6544","authenticated-orcid":false,"given":"Ji Hyun","family":"Ahn","sequence":"first","affiliation":[{"name":"Kangbuk Samsung Hospital"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5037-0304","authenticated-orcid":false,"given":"Dong-Wook","family":"Son","sequence":"additional","affiliation":[{"name":"Kangbuk Samsung Hospital"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,4,9]]},"reference":[{"key":"e_1_3_5_2_2","first-page":"20250508","article-title":"Unicompartmental knee arthroplasty offers more natural feeling joints compared with total knee arthroplasty: a systematic review and meta-analysis","volume":"10","author":"Poursalehian M","year":"2025","unstructured":"Poursalehian M, Khani Y, Ghaderpanah R, et al. Unicompartmental knee arthroplasty offers more natural feeling joints compared with total knee arthroplasty: a systematic review and meta-analysis. 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