{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T04:10:52Z","timestamp":1779250252165,"version":"3.51.4"},"reference-count":58,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T00:00:00Z","timestamp":1779235200000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T00:00:00Z","timestamp":1779235200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100005774","name":"Universitat de Barcelona","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100005774","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Arch Orthop Trauma Surg"],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:sec>\n                    <jats:title>Purpose<\/jats:title>\n                    <jats:p>All Poly (AP) tibial unicompartmental knee arthroplasty (UKA) seems to have advantages in comparison with metal-based (MB) UKA, such as greater polyethylene thickness, wear resistance, bone stock preservation and lower implant costs. The objective of this retrospective study was to evaluate the short-term clinical-functional and radiographic results, complications and survivorship of AP UKA performed consecutively with a minimum follow-up of 2 years.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Retrospective cohort analysis all consecutive knees operated with medial and lateral AP UKAs, including bilateral cases, with a minimum follow-up of 2 years. Demographic data were analyzed at the patient level and clinical-functional results were assessed per knee using the KSS, KOOS and VAS scales. Radiographically, mechanical axis (HKA) correction and the presence of radiolucency\u2009&gt;\u20092mm were evaluated. Complications incidence and prosthetic survivorship was determined. Pre-postoperative comparisons were performed using linear mixed-effects models with random intercept per patient to account for the non-independence of bilateral cases. Subgroup analyses involving fewer than 10 observations were considered exploratory and no formal statistical inference is drawn. A value of p\u2009&lt;\u20090.05 was considered statistically significant with a confidence interval (CI) 95%.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>42 AP UKAs were included, 5 lateral (11.9%) and 37 medial (88.1%) in 31 patients, 12 male (38.7%), 68.4\u2009\u00b1\u20098.9 years old, BMI of 32 (24.6\u201350.6) and mean follow-up of 32.3 months (24\u201344). Significant improvement in clinical KSS from 39.9\u2009\u00b1\u20093.3 to 89\u2009\u00b1\u20096.1 (\u0394 49.1; 95%CI 47.2 to 51.0; p\u2009&lt;\u20090.001), functional KSS from 23.3\u2009\u00b1\u20092.8 to 93.1\u2009\u00b1\u20099.3 (\u0394 69.9; 95%CI 67.1 to 72.6; p\u2009&lt;\u20090.001), KOOS from 33.0\u2009\u00b1\u20095.0 to 97.3\u2009\u00b1\u20096.2 (\u0394 64.2; 95%CI 62.0 to 66.5; p\u2009&lt;\u20090.001) and VAS from 9.4\u2009\u00b1\u20090.6 to 0.7\u2009\u00b1\u20091.3 (\u0394\u2009\u2212\u20098.7; 95%CI\u2009\u2212\u20099.1 to\u2009\u2212\u20098.3; p\u2009&lt;\u20090.001) was observed in all cases. HKA for medial UKA improved from 169.6\u2009\u00b1\u20094.1 to 175.1\u2009\u00b1\u20092.5 (\u0394 5.5\u00b0; 95%CI 4.6 to 6.3; p\u2009&lt;\u20090.001), and for lateral UKA from 189.8\u2009\u00b1\u20094.3 to 184.6\u2009\u00b1\u20090.5 (\u0394\u2009\u2212\u20095.2\u00b0; 95%CI\u2009\u2212\u20098.7 to\u2009\u2212\u20091.7; results are descriptive only due to insufficient sample size). Six complications were observed (14.3%), all of them minor with good evolution. One case (2.4%) required TKA revision due to persistent pain after 2 years postoperatively. Prosthetic survivorship was 97.6% (95%CI 92.2%\u2013100%).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The AP UKA was associated with favorable clinical-functional and radiographic outcomes, few complications and prosthetic survivorship of 97.6% after an average short-term follow-up of 32.3 months (24\u201344) in this single-center retrospective series, which included a high proportion of cases with BMI\u2009&gt;\u200930 (54.8%) and\u2009&gt;\u200940 (9.7%), advanced grade 4 osteoarthritis (78.6%) and severe deformities greater than 10\u00ba (40.5%) and 15\u00ba (19%). Given the observational design, short follow-up, and absence of a control group, these findings should be interpreted with caution. Prospective comparative trials and longer-term survivorship evaluation are needed.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of evidence<\/jats:title>\n                    <jats:p>IV, retrospective cohort study.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00402-026-06348-7","type":"journal-article","created":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T03:56:16Z","timestamp":1779249376000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Outcomes and short-term survivorship of fixed-bearing all-poly unicompartmental knee arthroplasty. A retrospective single-center study of 42 prostheses with a main follow-up of 32.3 months"],"prefix":"10.1007","volume":"146","author":[{"given":"Stefano","family":"Gaggiotti","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gabriel","family":"Gaggiotti","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sebastien","family":"Lustig","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Cecile","family":"Batailler","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Joan Carles","family":"Monllau","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Santino","family":"Gaggiotti","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Andreu","family":"Combalia","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2026,5,20]]},"reference":[{"issue":"5","key":"6348_CR1","doi-asserted-by":"publisher","first-page":"1453","DOI":"10.1016\/j.arth.2016.11.034","volume":"32","author":"MS Kim","year":"2017","unstructured":"Kim MS, Koh IJ, Choi YJ, Lee JY, In Y (2017) Differences in patient-reported outcomes between unicompartmental and total knee arthroplasties: a propensity score-matched analysis. 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Sebastien Lustig: Consultant for Stryker, Smith Nephew, Heraeus, Depuy Synthes; institutional re- search support from Groupe Lepine, Amplitude; editorial board for Journal of Bone and Joint Surgery (Am). Elvire Servien: Consultant for Corin. St\u00e9fano Gaggiotti: None. Joan Carles Monllau: None. Santino Gaggiotti: None. Andreu Combailia: None.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"All procedures were performed in accordance with the ethical standards of the institutional and\/or national research committee, the 1964 Helsinki Declaration and its later amendments, or comparable ethical standards. The Commission Nationale Informatique & Libert\u00e9s (CNIL) approved this study in Paris on April 19, 2022, under number 2226075v 0.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}}],"article-number":"193"}}