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Patients with a documented history of patellar dislocation and an MRI scan of the affected knee were included. Patients with articular cartilage injury prior to the dislocation event were excluded. Articular cartilage injury was graded using a validated system: AMADEUS (Mean Total Area Measurement and Depth &amp; Underlying Structures). Caton\u2010Deschamps Index (CDI) scores and Dejour classifications of trochlear dysplasia were also collected. Data were calculated by performing\n                      <jats:italic>t<\/jats:italic>\n                      tests, Mann\u2010Whitney tests, and \u03c7\n                      <jats:sup>2<\/jats:sup>\n                      or Fisher Exact tests to calculate\n                      <jats:italic>P<\/jats:italic>\n                      values for categorical data.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      In total, 233 patients were included: 117 with primary dislocations and 116 with recurrent dislocations. Articular cartilage injuries were present in 51 patients with primary dislocations (43.6%) and 68 patients with recurrent dislocations (58.6%,\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .026). On comparison of the groups, the recurrent group contained a significantly larger proportion of female patients (65.5% vs 46.2%,\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .004). There was no difference in lesion size, subchondral bone defect, presence of bone edema, or total AMADEUS score between groups (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .231). Caton\u2010Deschamps Index scores were not significant when comparing between groups; however, the Dejour classifications showed higher grades in the recurrent group (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .013 for A\u2010D grading scale and\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .005 for high\/low grading scale). Subgroup analysis revealed that when cartilage damage was present, patients from the primary group had significantly more full\u2010thickness lesions (\n                      <jats:italic>P<\/jats:italic>\n                      &lt; .001) and lower AMADEUS scores (\n                      <jats:italic>P<\/jats:italic>\n                      \u00a0= .016).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions<\/jats:title>\n                    <jats:p>There was a similarly high prevalence of cartilage injury seen on MRI after both a primary patellar dislocation and a recurrent patellar dislocation. Chondral injury primarily affected the medial and lateral patellar facets and the lateral femoral condyle in both the primary and recurrent dislocation groups. However, the primary group showed an increased number of full\u2010thickness lesions. There was no difference in lesion size, subchondral bone defect, presence of bone edema, or total AMADEUS score between the primary and recurrent groups.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Level of Evidence<\/jats:title>\n                    <jats:p>Level III, retrospective comparative prognostic investigation.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1016\/j.asmr.2023.100849","type":"journal-article","created":{"date-parts":[[2023,12,31]],"date-time":"2023-12-31T23:12:05Z","timestamp":1704064325000},"update-policy":"https:\/\/doi.org\/10.1016\/elsevier_cm_policy","source":"Crossref","is-referenced-by-count":4,"title":["Patients With First\u2010Time or Recurrent Patellar Dislocation Have a Similar High Rate and Extent of Articular Cartilage Injury Observed on Magnetic Resonance Imaging"],"prefix":"10.1002","volume":"6","author":[{"given":"Andres R.","family":"Perez","sequence":"first","affiliation":[{"name":"Rothman Orthopaedic Institute Philadelphia Pennsylvania U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Carlo","family":"Coladonato","sequence":"additional","affiliation":[{"name":"Rothman Orthopaedic Institute Philadelphia Pennsylvania U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John Hayden","family":"Sonnier","sequence":"additional","affiliation":[{"name":"Rothman Orthopaedic Institute Philadelphia Pennsylvania U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Samuel T.","family":"Saucedo","sequence":"additional","affiliation":[{"name":"Drexel University College of Medicine Philadelphia Pennsylvania U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John P.","family":"Avendano","sequence":"additional","affiliation":[{"name":"Robert Wood Johnson Medical School New Brunswick New Jersey U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John","family":"Corvi","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery Mount Sinai Hospital New York New York U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mike","family":"Campbell","sequence":"additional","affiliation":[{"name":"Rothman Orthopaedic Institute Philadelphia Pennsylvania U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Fotios P.","family":"Tjoumakaris","sequence":"additional","affiliation":[{"name":"Rothman Orthopaedic Institute Philadelphia Pennsylvania U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Steven B.","family":"Cohen","sequence":"additional","affiliation":[{"name":"Rothman Orthopaedic Institute Philadelphia Pennsylvania U.S.A."}],"role":[{"role":"author","vocabulary":"crossref"}]},{"suffix":"Jr.","given":"Michael 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