{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T09:53:35Z","timestamp":1791021215310,"version":"4.1.0"},"reference-count":32,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T00:00:00Z","timestamp":1790985600000},"content-version":"vor","delay-in-days":2,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2026,10,1]],"date-time":"2026-10-01T00:00:00Z","timestamp":1790812800000},"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":[[2026,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>Fixed\u2010bearing lateral unicompartmental knee arthroplasty (UKA) is a bone\u2010 and ligament\u2010preserving treatment option for isolated lateral\u2010compartment osteoarthritis (OA), but evidence in younger patients remains limited. The primary purpose of this study was to assess lateral component revision\u2010free survival and reoperation\u2010free survival following primary fixed\u2010bearing lateral UKA in patients aged 55 years or younger. Secondary objectives were to evaluate functional and radiological outcomes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>This retrospective case series was derived from a prospectively maintained institutional database. A consecutive series of 84 primary fixed\u2010bearing lateral UKAs in 80 patients aged \u226455 years, performed between January 2016 and December 2021 with a minimum follow\u2010up of 2 years was identified (mean follow\u2010up, 5.3\u2009\u00b1\u20091.9 years [range, 2.2\u20138.6 years]; mean age, 51 years [range, 37\u201355 years]). Kaplan\u2010Meier analysis estimated 5\u2010year survival for lateral component revision or reoperation. Lateral component revision was defined as the removal or exchange of any fixed implant component (femoral or tibial). Reoperation was defined as any subsequent surgical procedure on the operated knee. Functional outcomes were evaluated using the Oxford Knee Score (OKS) and University of California, Los Angeles Activity Score. Radiographic assessment included measurement of the hip\u2010knee\u2010ankle angle (HKAA).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      Lateral component revision\u2010free survival was 100%, while cumulative reoperation\u2010free survivorship was 92.5% (95% CI: 86.8\u201398.2) at 5 years. Seven reoperations were observed: 4 additional medial UKAs, 2 arthroscopic procedures and 1 successful debridement, antibiotics and implant retention (DAIR). Mean HKAA changed from 4.8\u00b0\u2009\u00b1\u20094.7\u00b0 valgus preoperatively to 2.0\u00b0\u2009\u00b1\u20092.8\u00b0 valgus postoperatively. Postoperative HKAA demonstrated higher residual valgus in knees without medial\u2010compartment OA progression or osteonecrosis (ON) compared to four knees with medial\u2010compartment OA or ON (2.2\u00b0 valgus vs. 1.5\u00b0 varus,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.012). The mean postoperative OKS was 43.8\u2009\u00b1\u20095.7 and the UCLA Activity Score was 6.5\u2009\u00b1\u20091.2.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>Fixed\u2010bearing lateral UKA in younger patients was associated with 100% lateral component revision\u2010free survival and high functional scores at a mean follow\u2010up of 5 years. No implant\u2010related failures, such as aseptic loosening, were observed in this active cohort, although seven knees underwent reoperation, including four additional medial UKAs. Progression of OA in the medial compartment was the most common reason for reoperation. The observed association between postoperative varus alignment and medial\u2010compartment OA progression or ON is limited by the small number of events and requires further investigation.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level IV.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1002\/jeo2.70935","type":"journal-article","created":{"date-parts":[[2026,10,3]],"date-time":"2026-10-03T09:01:21Z","timestamp":1791018081000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Excellent survivorship and functional outcomes following lateral unicompartmental knee arthroplasty in patients aged 55 years or younger"],"prefix":"10.1002","volume":"13","author":[{"given":"Solongo","family":"Abdulai","sequence":"first","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Conradin","family":"Schweizer","sequence":"additional","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Valentin","family":"R\u00fchle","sequence":"additional","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tatjana","family":"Krug","sequence":"additional","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Raffaela","family":"Morgenbesser","sequence":"additional","affiliation":[{"name":"Department of Orthopedics and Traumatology Paracelsus Medical University of Salzburg Salzburg Austria"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Joachim","family":"Herre","sequence":"additional","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter R.","family":"Aldinger","sequence":"additional","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christian","family":"Merle","sequence":"additional","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0218-1426","authenticated-orcid":false,"given":"Wenzel","family":"Waldstein","sequence":"additional","affiliation":[{"name":"Orthop\u00e4dische Klinik Paulinenhilfe Diakonie Klinikum Stuttgart Stuttgart Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2026,10,3]]},"reference":[{"key":"e_1_2_12_2_1","doi-asserted-by":"crossref","first-page":"21","DOI":"10.1186\/s42836-024-00242-6","article-title":"Unicompartmental knee replacement: controversies and technical considerations","volume":"6","author":"Albishi W","year":"2024","journal-title":"Arthroplasty"},{"key":"e_1_2_12_3_1","doi-asserted-by":"crossref","first-page":"432","DOI":"10.1302\/0301-620X.107B4.BJJ-2024-0977.R1","article-title":"Mid\u2010term outcomes of the fixed\u2010bearing lateral Oxford unicompartmental knee arthroplasty","volume":"107","author":"Arthur LW","year":"2025","journal-title":"Bone Jt J"},{"key":"e_1_2_12_4_1","doi-asserted-by":"crossref","first-page":"4324","DOI":"10.1002\/ksa.12785","article-title":"Optimising outcomes in lateral unicompartmental knee arthroplasty: analysing 25 years of registry data","volume":"33","author":"Bunyoz 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