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Five morphological parameters related to the VMO (elevation in the sagittal plane and coronal plane, craniocaudal extent, muscle-fibre angulation, cross-sectional area ratio) and two patella tilt parameters (patella tilt angle, bisect offset ratio) were measured in MR images. The independent-samples t test or chi-square test was used for statistical comparisons.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>The mean ages of the patients in the recurrent LPD group and control group were 22.1\u2009\u00b1\u20099.9\u00a0years and 24.0\u2009\u00b1\u20096.5\u00a0years, respectively. Eighteen out of seventy-five (24%) patients MRI showed VMO injuries. Compared with the control group, the patients with recurrent LPD showed significantly higher sagittal VMO elevation (10.4\u2009\u00b1\u20092.3\u00a0mm vs. 4.1\u2009\u00b1\u20091.9\u00a0mm), coronal VMO elevation (15.9\u2009\u00b1\u20095.7\u00a0mm vs. 3.9\u2009\u00b1\u20093.7\u00a0mm), muscle-fibre angulation (35.4\u2009\u00b1\u20098.0\u00b0 vs. 27.9\u2009\u00b1\u20096.3\u00b0), patella tilt angle (25.9\u2009\u00b1\u200910.7\u00b0 vs. 9.1\u2009\u00b1\u20095.2\u00b0), and bisect offset ratio values (0.9\u2009\u00b1\u20090.3 vs. 0.5\u2009\u00b1\u20090.1) and significantly lower craniocaudal extent (13.7\u2009\u00b1\u20095.3\u00a0mm vs. 16.7\u2009\u00b1\u20095.1\u00a0mm) and cross-sectional area ratio values (0.05\u2009\u00b1\u20090.02 vs. 0.07\u2009\u00b1\u20090.02).<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>The results showed that abnormalities in the VMO and patella tilt were clearly present in recurrent LPD patients compared with normal people.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1186\/s12880-020-00542-8","type":"journal-article","created":{"date-parts":[[2021,1,6]],"date-time":"2021-01-06T13:03:54Z","timestamp":1609938234000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":14,"title":["Morphological study of the vastus medialis oblique in recurrent patellar dislocation based on magnetic resonance images"],"prefix":"10.1186","volume":"21","author":[{"given":"Lei","family":"Shu","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xu","family":"Yang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hangyuan","family":"He","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Biao","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liaobin","family":"Chen","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qubo","family":"Ni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,1,6]]},"reference":[{"issue":"12","key":"542_CR1","doi-asserted-by":"publisher","first-page":"2751","DOI":"10.2106\/JBJS.H.00211","volume":"90","author":"AC Colvin","year":"2008","unstructured":"Colvin AC, West RV. 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