{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,27]],"date-time":"2026-06-27T13:18:24Z","timestamp":1782566304169,"version":"3.54.5"},"reference-count":26,"publisher":"British Editorial Society of Bone & Joint Surgery","issue":"8","license":[{"start":{"date-parts":[[2009,8,1]],"date-time":"2009-08-01T00:00:00Z","timestamp":1249084800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/online.boneandjoint.org.uk\/TDM"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["The Journal of Bone and Joint Surgery. British volume"],"published-print":{"date-parts":[[2009,8]]},"abstract":"<jats:p>This study examined the relationship between the cross-over sign and the true three-dimensional anatomical version of the acetabulum. We also investigated whether in true retroversion there is excessive femoral head cover anteriorly. Radiographs of 64 hips in patients being investigated for symptoms of femoro-acetabular impingement were analysed and the presence of a cross-over sign was documented. CT scans of the same hips were analysed to determine anatomical version and femoral head cover in relation to the anterior pelvic plane after correcting for pelvic tilt. The sensitivity and specificity of the cross-over sign were 92% and 55%, respectively for identifying true acetabular retroversion. There was no significant difference in total cover between normal and retroverted cases. Anterior and posterior cover were, however, significantly different (p &lt; 0.001 and 0.002). The cross-over sign was found to be sensitive but not specific. The results for femoral head cover suggest that retroversion is characterised by posterior deficiency but increased cover anteriorly.<\/jats:p>","DOI":"10.1302\/0301-620x.91b8.22389","type":"journal-article","created":{"date-parts":[[2009,8,3]],"date-time":"2009-08-03T16:23:06Z","timestamp":1249316586000},"page":"1031-1036","source":"Crossref","is-referenced-by-count":103,"title":["Three-dimensional CT analysis to determine acetabular retroversion and the implications for the management of femoro-acetabular impingement"],"prefix":"10.1302","volume":"91-B","author":[{"given":"W.","family":"Dandachli","sequence":"first","affiliation":[{"name":"Department of Orthopaedic, Surgery, Imperial College Hospitals, Fulham Palace Road, London, W6 8RF, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"S. Ul","family":"Islam","sequence":"additional","affiliation":[{"name":"University College London Hospitals, 235 Euston Road, London NW1 2BU, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Liu","sequence":"additional","affiliation":[{"name":"University College London Hospitals, 235 Euston Road, London NW1 2BU, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"R.","family":"Richards","sequence":"additional","affiliation":[{"name":"University College London Hospitals, 235 Euston Road, London NW1 2BU, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"M.","family":"Hall-Craggs","sequence":"additional","affiliation":[{"name":"University College London Hospitals, 235 Euston Road, London NW1 2BU, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Witt","sequence":"additional","affiliation":[{"name":"University College London Hospitals, 235 Euston Road, London NW1 2BU, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"42","reference":[{"key":"R1","unstructured":"Smith-Petersen MN.Treatment of malum coxae senitis, old slipped upper femoral epiphysis, intrapelvic protrusion of the acetabulum, and coxa plana by means of acetabuloplasty. J Bone Joint Surg 1936;18:869\u201380."},{"key":"R2","unstructured":"Stulberg SD, Cordell LD, Harris WH, Ramsey PL, MacEwen GD.Unrecognised childhood hip disease: a major cause of idiopathic osteoarthritis of the hip. In: Amstutz HC, ed.The Hip. Procs Third Open Scientific Meeting of the Hip Society. St Louis: CV Mosby, 1975:212\u201328."},{"key":"R3","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.87B7.15203"},{"key":"R4","doi-asserted-by":"crossref","unstructured":"Ganz R, Parvizi J, Beck M, et al.Femoroacetabular impingement: a cause for osteoarthritis of the hip. Clin Orthop 2003;417:112\u201320.","DOI":"10.1097\/01.blo.0000096804.78689.c2"},{"key":"R5","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.83B2.0830171"},{"key":"R6","doi-asserted-by":"crossref","unstructured":"Espinosa N, Rothenfluh DA, Beck M, Ganz R, Leunig M.Treatment of femoro-acetabular impingement: preliminary results of labral refixation. J Bone Joint Surg [Am] 2006;88-A:925\u201335.","DOI":"10.2106\/JBJS.E.00290"},{"key":"R7","doi-asserted-by":"crossref","unstructured":"Meyer DC, Beck M, Ellis T, Ganz R, Leunig M.Comparison of six radiographic projections to assess femoral head\/neck asphericity. Clin Orthop 2006;445:181\u20135.","DOI":"10.1097\/01.blo.0000201168.72388.24"},{"key":"R8","doi-asserted-by":"publisher","DOI":"10.1016\/j.orthres.2005.03.011.1100230608"},{"key":"R9","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.84B4.0840556"},{"key":"R10","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.81B2.0810281"},{"key":"R11","doi-asserted-by":"publisher","DOI":"10.1002\/jor.20380"},{"key":"R12","doi-asserted-by":"crossref","unstructured":"Tannast M, Zheng G, Anderegg C, et al.Tilt and rotation correction of acetabular version on pelvic radiographs. Clin Orthop 2005;438:182\u201390.","DOI":"10.1097\/01.blo.0000167669.26068.c5"},{"key":"R13","doi-asserted-by":"publisher","DOI":"10.1097\/00003086-200302000-00033"},{"key":"R14","doi-asserted-by":"publisher","DOI":"10.1097\/00003086-200112000-00006"},{"key":"R15","doi-asserted-by":"publisher","DOI":"10.1007\/BF02341662"},{"key":"R16","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.90B11.20073"},{"key":"R17","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-007-0058-6"},{"key":"R18","doi-asserted-by":"crossref","unstructured":"Giori NJ, Trousdale RT.Acetabular retroversion is associated with osteoarthritis of the hip. Clin Orthop 2003;417:263\u20139.","DOI":"10.1097\/01.blo.0000093014.90435.64"},{"key":"R19","doi-asserted-by":"crossref","unstructured":"Ezoe M, Naito M, Inoue T.The prevalence of acetabular retroversion among various disorders of the hip. J Bone Joint Surg [Am] 2006;88-A:372\u20139.","DOI":"10.2106\/JBJS.D.02385"},{"key":"R20","doi-asserted-by":"publisher","DOI":"10.5435\/00124635-200709000-00006"},{"key":"R21","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-200302000-00015"},{"key":"R22","doi-asserted-by":"publisher","DOI":"10.1159\/000148021"},{"key":"R23","doi-asserted-by":"publisher","DOI":"10.1016\/S0021-9290(97)00041-9"},{"key":"R24","doi-asserted-by":"crossref","unstructured":"Hodge WA, Carlson KL, Fijan RS, et al.Contact pressures from an instrumented hip endoprosthesis. J Bone Joint Surg [Am] 1989;71-A:1378\u201386.","DOI":"10.2106\/00004623-198971090-00015"},{"key":"R25","doi-asserted-by":"publisher","DOI":"10.2106\/00004623-199912000-00014"},{"key":"R26","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.88B11.17986"}],"container-title":["The Journal of Bone and Joint Surgery. British volume"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/pdf\/10.1302\/0301-620X.91B8.22389","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/full-xml\/10.1302\/0301-620X.91B8.22389","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/pdf\/10.1302\/0301-620X.91B8.22389","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,5,26]],"date-time":"2023-05-26T06:27:32Z","timestamp":1685082452000},"score":1,"resource":{"primary":{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/10.1302\/0301-620X.91B8.22389"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2009,8]]},"references-count":26,"journal-issue":{"issue":"8","published-print":{"date-parts":[[2009,8]]}},"alternative-id":["10.1302\/0301-620X.91B8.22389"],"URL":"https:\/\/doi.org\/10.1302\/0301-620x.91b8.22389","relation":{},"ISSN":["0301-620X","2044-5377"],"issn-type":[{"value":"0301-620X","type":"print"},{"value":"2044-5377","type":"electronic"}],"subject":[],"published":{"date-parts":[[2009,8]]}}}