{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,22]],"date-time":"2026-10-22T06:52:14Z","timestamp":1792651934469,"version":"4.5.0"},"reference-count":51,"publisher":"British Editorial Society of Bone & Joint Surgery","issue":"7","license":[{"start":{"date-parts":[[2013,7,1]],"date-time":"2013-07-01T00:00:00Z","timestamp":1372636800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/online.boneandjoint.org.uk\/TDM"}],"content-domain":{"domain":["online.boneandjoint.org.uk"],"crossmark-restriction":true},"short-container-title":["The Bone &amp; Joint Journal"],"published-print":{"date-parts":[[2013,7]]},"abstract":"<jats:p> Orthopaedic surgeons have accepted various radiological signs to be representative of acetabular retroversion, which is the main characteristic of focal over-coverage in patients with femoroacetabular impingement (FAI). Using a validated method for radiological analysis, we assessed the relevance of these signs to predict intra-articular lesions in 93\u00a0patients undergoing surgery for FAI. A logistic regression model to predict chondral damage showed that an acetabular retroversion index (ARI) &gt; 20%, a derivative of the well-known cross-over sign, was an independent predictor (p = 0.036). However, ARI was less significant than the T\u00f6nnis classification (p = 0.019) and age (p = 0.031) in the same model. ARI was unable to discriminate between grades of chondral lesions, while the type of cam lesion (p\u00a0=\u00a00.004) and age (p = 0.047) were able to. Other widely recognised signs of acetabular retroversion, such as the ischial spine sign, the posterior wall sign or the cross-over sign were irrelevant according to our analysis. Regardless of its secondary predictive role, an ARI &gt; 20% appears to be the most clinically relevant radiological sign of acetabular retroversion in symptomatic patients with FAI. <\/jats:p><jats:p> Cite this article: Bone Joint J 2013;95-B:893\u20139. <\/jats:p>","DOI":"10.1302\/0301-620x.95b7.31109","type":"journal-article","created":{"date-parts":[[2013,6,27]],"date-time":"2013-06-27T09:49:11Z","timestamp":1372326551000},"page":"893-899","update-policy":"https:\/\/doi.org\/10.1302\/crossmark-policy","source":"Crossref","is-referenced-by-count":34,"title":["The relevance of the radiological signs of acetabular retroversion among patients with femoroacetabular impingement"],"prefix":"10.1302","volume":"95-B","author":[{"given":"C.","family":"Diaz-Ledezma","sequence":"first","affiliation":[{"name":"The Rothman Institute at Thomas Jefferson\rUniversity, Sheridan Building, 10th\rFloor, 125 South 9th Street, Philadelphia, Pennsylvania\r19107, 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