{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T02:17:43Z","timestamp":1791253063085,"version":"4.1.0"},"reference-count":49,"publisher":"Wiley","issue":"4","license":[{"start":{"date-parts":[[2012,8,17]],"date-time":"2012-08-17T00:00:00Z","timestamp":1345161600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Knee surg. sports traumatol. arthrosc."],"published-print":{"date-parts":[[2013,4]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>To investigate the prevalence of patellofemoral osteoarthritis (OA) and to explore the association between radiographic patellofemoral OA and symptoms and function 12 years after anterior cruciate ligament (ACL) reconstruction.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>The study participants (<jats:italic>n<\/jats:italic> = 221) were consecutively included at the time of an ACL reconstruction in the period from 1990 to 1997. Knee laxity (KT\u20101000), isokinetic quadriceps strength, triple jump, stair hop, and the Cincinnati knee score were measured 6\u00a0months, 1 year, 2 years, and 12 years after surgery. At the 12\u2010year follow\u2010up, visual analogue scale for pain, the Knee injury and Osteoarthritis Outcome Score, the Tegner activity scale, and radiographic examination (Kellgren and Lawrence score) were added. To analyse the association between patellofemoral OA, symptoms, and function, binary regression analyses presenting odds ratios and 95 % confidence intervals were used. The analyses were adjusted for age, gender, and body mass index.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>One hundred and eighty\u2010one of the 221 subjects (82 %), including 76 females (42 %) and 105\u00a0males (58 %), were evaluated at the 12.3 \u00b1 1.2\u2010year follow\u2010up. Mean age at the follow\u2010up was 39.1 \u00b1 8.7 years. Additional meniscal or chondral injuries at the time of reconstruction or during the follow\u2010up period were detected in 116 subjects (64 %). Radiographic patellofemoral OA was found in 48 subjects (26 %), including 3 subjects with isolated patellofemoral OA (1.5 %). Those with patellofemoral OA were older, had more tibiofemoral OA, and had significantly more symptoms and impaired function compared with those without patellofemoral OA.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Patellofemoral OA was found in 26 % 12 years after ACL reconstruction. Patellofemoral OA was associated with increased age, tibiofemoral OA, increased symptoms, and reduced function. It is of clinical importance to include functional and radiographic assessment of the patellofemoral joint in the examination of long\u2010term consequences following an ACL reconstruction.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>II.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-012-2161-9","type":"journal-article","created":{"date-parts":[[2012,8,16]],"date-time":"2012-08-16T06:20:54Z","timestamp":1345098054000},"page":"942-949","source":"Crossref","is-referenced-by-count":70,"title":["The prevalence of patellofemoral osteoarthritis 12 years after anterior cruciate ligament reconstruction"],"prefix":"10.1002","volume":"21","author":[{"given":"Britt Elin","family":"\u00d8iestad","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Norwegian Research Center for Active Rehabilitation (NAR) Oslo University Hospital Hjelp24 NIMI Pb. 3843, Ullevaal Stadion 0805 Oslo 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Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"May Arna","family":"Risberg","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Norwegian Research Center for Active Rehabilitation (NAR) Oslo University Hospital Hjelp24 NIMI Pb. 3843, Ullevaal Stadion 0805 Oslo Norway"},{"name":"<!--<label>4<\/label>--> Department of Sport Medicine Norwegian School of Sports Sciences Oslo Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2012,8,17]]},"reference":[{"key":"e_1_2_7_2_2","first-page":"421","article-title":"Long\u2010term results of anterior cruciate ligament reconstruction using bone\u2010patellar tendon\u2010bone: an analysis of the factors affecting the development of osteoarthritis","volume":"22","author":"Ahn JH","year":"2012","journal-title":"Arthrosc 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