{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,30]],"date-time":"2026-09-30T03:41:18Z","timestamp":1790739678552,"version":"4.1.0"},"reference-count":51,"publisher":"Wiley","issue":"3","license":[{"start":{"date-parts":[[2012,5,9]],"date-time":"2012-05-09T00:00:00Z","timestamp":1336521600000},"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":[[2013,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Purpose<\/jats:title><jats:p>Patellar dislocation usually occurs to the lateral side, leading to ruptures of the medial patellofemoral ligament (MPFL) in about 90 % of all cases. Reliable prognostic factors for the stability of the patellofemoral joint after MPFL surgery and satisfaction of the patient have not been established as yet.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>This multicentric study retrospectively included 40 patients with a mean age of 22.4 \u00b1 8.1 years (range 9\u201348) from 5 German Trauma Departments with first\u2010time traumatic patellar dislocation and operative treatment. Surgery was limited to soft tissue repairs, and a preoperative magnetic resonance imaging (MRI) was performed in all cases. Evaluation of the MRI included sulcus angle, dysplasia of the trochlea, depth and facet asymmetry of the trochlea, Insall\u2010Salvati index, Tibial tuberosity to trochlear groove (TTTG) distance, and rupture patterns of the MPFL. Patients were interrogated after 2 years about recurrent dislocation, satisfaction, and the Kujala score.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Trochlea facet asymmetry was significantly lower in patients with redislocation (23.5 \u00b1 18.8) than in patients without redislocation (43.1 \u00b1 16.5, <jats:italic>p<\/jats:italic> = 0.03). Patients with a patellar\u2010based rupture were significantly younger (19.5 \u00b1 7.2 years) than patients without patellar\u2010based rupture (25.4 \u00b1 8.1 years, <jats:italic>p<\/jats:italic> &lt; 0.02). Patients with femoral\u2010based ruptures were significantly older (25.7 \u00b1 9.2 years) than patients without femoral\u2010based rupture (19.7 \u00b1 6.1 years, <jats:italic>p<\/jats:italic> &lt; 0.02), and had a significantly higher TTTG distance (10.2 \u00b1 6.9 vs. 4.5 \u00b1 5.5, <jats:italic>p<\/jats:italic> &lt; 0.02). Patients with incomplete ruptures of the MPFL had a significantly lower Insall\u2010Salvati index (1.2 \u00b1 0.2 vs. 1.4 \u00b1 0.2, <jats:italic>p<\/jats:italic> = 0.05). The Kujala score in patients with redislocations was significantly lower (81.0 \u00b1 10.5 points) than in patients without redislocation (91.9 \u00b1 9.2 points, <jats:italic>p<\/jats:italic> &lt; 0.02).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Younger patients more often sustain patellar\u2010based ruptures following first\u2010time traumatic patella dislocation, while older patients more often sustain femoral\u2010based ruptures of the MPFL. Incomplete MPFL ruptures are correlated with lower Insall\u2010Salvati indices. Low trochlear facet asymmetry is correlated with higher rates of redislocation. These results may be of relevance for the operative and postoperative treatment in the future.<\/jats:p><\/jats:sec><jats:sec><jats:title>Level of evidence<\/jats:title><jats:p>Prognostic study, Level IV.<\/jats:p><\/jats:sec>","DOI":"10.1007\/s00167-012-2037-z","type":"journal-article","created":{"date-parts":[[2012,5,8]],"date-time":"2012-05-08T03:29:51Z","timestamp":1336447791000},"page":"683-689","source":"Crossref","is-referenced-by-count":51,"title":["Influence of rupture patterns of the medial patellofemoral ligament (MPFL) on the outcome after operative treatment of traumatic patellar dislocation"],"prefix":"10.1002","volume":"21","author":[{"given":"M.","family":"Petri","sequence":"first","affiliation":[{"name":"<!--<label>1<\/label>--> Trauma Department Hannover Medical School (MHH) Carl\u2010Neuberg\u2010Stra\u00dfe 1 30625 Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"von Falck","sequence":"additional","affiliation":[{"name":"<!--<label>2<\/label>--> Radiology Department Hannover Medical School (MHH) Carl\u2010Neuberg\u2010Str. 1 30625 Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Broese","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Trauma Department Hannover Medical School (MHH) Carl\u2010Neuberg\u2010Stra\u00dfe 1 30625 Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"E.","family":"Liodakis","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Trauma Department Hannover Medical School (MHH) Carl\u2010Neuberg\u2010Stra\u00dfe 1 30625 Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Balcarek","sequence":"additional","affiliation":[{"name":"<!--<label>3<\/label>--> Trauma Department University Hospital G\u00f6ttingen Robert\u2010Koch\u2010Str. 40 37075 G\u00f6ttingen Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"P.","family":"Niemeyer","sequence":"additional","affiliation":[{"name":"<!--<label>4<\/label>--> Trauma Department University Hospital Freiburg Hugstetter Str. 49 79095 Freiburg Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Hofmeister","sequence":"additional","affiliation":[{"name":"<!--<label>5<\/label>--> Trauma Department Traumacenter Murnau Prof. K\u00fcntscher\u2010Str. 8 82418 Murnau Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Krettek","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Trauma Department Hannover Medical School (MHH) Carl\u2010Neuberg\u2010Stra\u00dfe 1 30625 Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Voigt","sequence":"additional","affiliation":[{"name":"<!--<label>6<\/label>--> Department of Trauma and Reconstructive Surgery Friederikenstift Hospital Hannover Humboldtstr. 5 30169 Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"C.","family":"Haasper","sequence":"additional","affiliation":[{"name":"<!--<label>1<\/label>--> Trauma Department Hannover Medical School (MHH) Carl\u2010Neuberg\u2010Stra\u00dfe 1 30625 Hannover Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Zeichen","sequence":"additional","affiliation":[{"name":"<!--<label>7<\/label>--> Trauma Department Johannes Wesling Hospital Minden Hans\u2010Nolte\u2010Str. 1 32429 Minden Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"K. 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