{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,1]],"date-time":"2026-08-01T02:43:36Z","timestamp":1785552216019,"version":"3.56.0"},"reference-count":36,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2021,4,2]],"date-time":"2021-04-02T00:00:00Z","timestamp":1617321600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"},{"start":{"date-parts":[[2021,4,2]],"date-time":"2021-04-02T00:00:00Z","timestamp":1617321600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2021,4,2]],"date-time":"2021-04-02T00:00:00Z","timestamp":1617321600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100005713","name":"Technische Universit\u00e4t M\u00fcnchen","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100005713","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Arthrosurface, Franklin, MA, USA"},{"DOI":"10.13039\/501100005713","name":"Technische Universit\u00e4t M\u00fcnchen","doi-asserted-by":"crossref","id":[{"id":"10.13039\/501100005713","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2022,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To evaluate the clinical outcomes of patients with a minimum 2\u2010year follow\u2010up following contemporary patellofemoral inlay arthroplasty (PFIA) and to identify potential risk factors for failure in a multi\u2010center study.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>All patients who underwent implantation of PFIA between 09\/2009 and 11\/2016 at 11 specialized orthopedic referral centers were enrolled in the study and were evaluated retrospectively at a minimum 2\u2010year follow\u2010up. Clinical outcomes included the Western Ontario and McMaster Universities Osteoarthritis Index (WOMAC) score, the Knee Injury and Osteoarthritis Outcome Score (KOOS), the Tegner Scale, the visual analogue scale (VAS) for pain, and subjective patient satisfaction. Pre\u2010 and perioperative risk factors were compared among failures and non\u2010failures to determine potential risk factors.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>A total of 263 patients (85% follow\u2010up rate) could be enrolled. The mean age at the time of index surgery was 49\u2009\u00b1\u200912 years with a mean postoperative follow\u2010up of 45\u2009\u00b1\u200918\u00a0months. The overall failure rate was 11% (28 patients), of which 18% (5 patients) were patients with patella resurfacing at index surgery and 82% (23 patients) were patients without initial patella resurfacing. At final follow\u2010up, 93% of the patients who did not fail were satisfied with the procedure with a mean transformed WOMAC Score of 84.5\u2009\u00b1\u200914.5 points, a mean KOOS Score of 73.3\u2009\u00b1\u200917.1 points, a mean Tegner Score of 3.4\u2009\u00b1\u20091.4 points and a mean VAS pain of 2.4\u2009\u00b1\u20092.0 points. An increased BMI was significantly correlated with a worse postoperative outcome. Concomitant procedures addressing patellofemoral instability or malalignment, the lack of patellofemoral resurfacing at the index surgery and a high BMI were significantly correlated with failure in our patient cohort.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Patellofemoral inlay arthroplasty shows high patient satisfaction with good functional outcomes at short\u2010term follow\u2010up and thus can be considered a viable treatment option in young patients suffering from isolated patellofemoral arthritis. Patellar resurfacing at index surgery is recommended to decrease the risk of failure.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>Retrospective case series, Level IV.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-021-06544-5","type":"journal-article","created":{"date-parts":[[2021,4,2]],"date-time":"2021-04-02T15:02:31Z","timestamp":1617375751000},"page":"1212-1219","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["The lack of retropatellar resurfacing at index surgery is significantly associated with failure in patients following patellofemoral inlay arthroplasty: a multi\u2010center study of more than 260 patients"],"prefix":"10.1002","volume":"30","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-5085-6446","authenticated-orcid":false,"given":"Andreas B.","family":"Imhoff","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopedic Sports Medicine, Klinikum rechts der Isar Technical University of Munich Ismaninger Str. 22 81675 Munich Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Eva","family":"Bartsch","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopedic Sports Medicine, Klinikum rechts der Isar Technical University of Munich Ismaninger Str. 22 81675 Munich Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Christoph","family":"Becher","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> ATOS Clinic Heidelberg Bismarckstr. 9\u201015 69115 Heidelberg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Peter","family":"Behrens","sequence":"additional","affiliation":[{"name":"<!--<label>3<\/label>--> Orthodok Tonndorfer Hauptstra\u00dfe 71 22045 Hamburg 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Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Holger","family":"Falk","sequence":"additional","affiliation":[{"name":"<!--<label>4<\/label>--> Gelenkzentrum Rhein\u2010Main Frankfurter Stra\u00dfe 94 65239 Hochheim am Main Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthias J.","family":"Feucht","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Department of Orthopedic Sports Medicine, Klinikum rechts der Isar Technical University of Munich Ismaninger Str. 22 81675 Munich Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ulrich","family":"Haupt","sequence":"additional","affiliation":[{"name":"<!--<label>5<\/label>--> Orthomotion, City Clinic Thun Marktgasse 17 3600 Thun Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Stefan","family":"Hinterwimmer","sequence":"additional","affiliation":[{"name":"<!--<label>6<\/label>--> OrthoPlus Munich, Alte B\u00f6rse Lenbachplatz 2a 80333 Munich Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johannes","family":"Holz","sequence":"additional","affiliation":[{"name":"<!--<label>7<\/label>--> Orthocentrum Hansastr. 1\u20103 20149 Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ren\u00e9","family":"Hutter","sequence":"additional","affiliation":[{"name":"<!--<label>8<\/label>--> Department of Orthopedics Kantonspital Graub\u00fcnden Lo\u00ebstrasse 99 7000 Chur Switzerland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ren\u00e9","family":"Kaiser","sequence":"additional","affiliation":[{"name":"<!--<label>7<\/label>--> Orthocentrum Hansastr. 1\u20103 20149 Hamburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Tobias","family":"Knoblauch","sequence":"additional","affiliation":[{"name":"<!--<label>14<\/label>--> Gelenkzentrum Leipzig Richard\u2010Lehmann\u2010Str. 21 04275 Leipzig 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May 2020","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"18 March 2021","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"2 April 2021","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"Andreas B. Imhoff is a consultant for Arthrosurface, Franklin, MA, USA. Ulrich Haupt is a consultant for Curmed AG Swiss. Turlough O\u2019Donnel is a consultant for Arthrosurface, Franklin, MA, USA and Stryker Inc., Kalamazoo, Michigan, USA. All author autors declare no conflict of interests.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Conflict of interest"}},{"value":"Institutional Review Board (IRB)\u2014Ethical approval (No. 181\/16S). Ethical approval was obtained from the Ethics Committee of the technical University Munich. All procedures performed were in accordance with the ethical standards of the institutional and\/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.","order":3,"name":"Ethics","group":{"name":"EthicsHeading","label":"Ethical approval"}},{"value":"Informed consent was obtained from all individual participants included in the study.","order":4,"name":"Ethics","group":{"name":"EthicsHeading","label":"Informed consent"}}]}}