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The subjects were comprised of ten male and ten female healthy volunteers. The length of the MPFL was measured using an open\u2010MRI both from a leg extended position and a highly knee\u2010flexed position in order to analyze the length change pattern of the MPFL. The MPFL length for men and women resulted in an average of 52 \u00b1 3\u00a0mm and 43 \u00b1 2\u00a0mm at the knee extended position, respectively. The length change pattern of the MPFL presented a slight change at up to a flexion angle of 60\u00b0 and a decrease at over 60\u00b0. In terms of morphology, the fiber bundle of the MPFL experienced linear tension at a knee flexion angle of 60\u00b0. We determined that the MPFL length in vivo exhibited a specific length change pattern. MPFL mainly contributes to the medial constraint of a patella with a knee flexion of 0\u00b0 to 60\u00b0, wherein it is expected to have the strongest strain at 60\u00b0. However, more studies are needed to obtain a better understanding of cases with a history of patellar dislocation.<\/jats:p>","DOI":"10.1007\/s00167-010-1043-2","type":"journal-article","created":{"date-parts":[[2010,1,29]],"date-time":"2010-01-29T08:52:12Z","timestamp":1264755132000},"page":"1470-1475","source":"Crossref","is-referenced-by-count":38,"title":["An analysis of the medial patellofemoral ligament length change pattern using open\u2010MRI"],"prefix":"10.1002","volume":"18","author":[{"given":"Tetsuo","family":"Higuchi","sequence":"first","affiliation":[{"name":"Department of Orthopaedics the Graduate School of Medical Science Kyoto Prefectural University of Medicine 465\u00a0Kajii\u2010chou, Kawaramachi\u2010Hirokoji 602\u20108566 Kamigyo\u2010ku Kyoto Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yuji","family":"Arai","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics the Graduate School of Medical Science Kyoto Prefectural 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