{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,5]],"date-time":"2026-11-05T08:02:43Z","timestamp":1793865763731,"version":"4.6.1"},"reference-count":27,"publisher":"British Editorial Society of Bone & Joint Surgery","issue":"9","license":[{"start":{"date-parts":[[2014,9,1]],"date-time":"2014-09-01T00:00:00Z","timestamp":1409529600000},"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":[[2014,9]]},"abstract":"<jats:p>The cam-type deformity in femoroacetabular impingement is a 3D deformity. Single measurements using radiographs, CT or MRI may not provide a true estimate of the magnitude of the deformity. We performed an analysis of the size and location of measurements of the alpha angle (\u03b1\u00b0) using a CT technique which could be applied to the 3D reconstructions of the hip. Analysis was undertaken in 42 patients (57 hips; 24 men and 18 women; mean age 38 years (16 to 58)) who had symptoms of femoroacetabular impingement related to a cam-type abnormality. An \u03b1\u00b0 of &gt; 50\u00b0 was considered a significant indicator of cam-type impingement. Measurements of the \u03b1\u00b0 were made at different points around the femoral head\/neck junction at intervals of 30\u00b0: starting at the nine o\u2019clock (posterior), ten, eleven and twelve o\u2019clock (superior), one, two and ending at three o\u2019clock (anterior) position.<\/jats:p>\n                  <jats:p>The mean maximum increased \u03b1\u00b0 was 64.6\u00b0 (50.8\u00b0 to 86\u00b0). The two o\u2019clock position was the most common point to find an increased \u03b1\u00b0 (53 hips; 93%), followed by one o\u2019clock (48 hips; 84%). The largest \u03b1\u00b0 for each hip was found most frequently at the two o\u2019clock position (46%), followed by the one o\u2019clock position (39%). Generally, raised \u03b1 angles extend over three segments of the clock face.<\/jats:p>\n                  <jats:p>Single measurements of the \u03b1\u00b0, whether pre- or post-operative, should be viewed with caution as they may not be representative of the true size of the deformity and not define whether adequate correction has been achieved following surgery.<\/jats:p>\n                  <jats:p>Cite this article: Bone Joint J 2014;96-B:1167\u201371.<\/jats:p>","DOI":"10.1302\/0301-620x.96b9.33555","type":"journal-article","created":{"date-parts":[[2014,9,2]],"date-time":"2014-09-02T10:23:37Z","timestamp":1409653417000},"page":"1167-1171","update-policy":"https:\/\/doi.org\/10.1302\/crossmark-policy","source":"Crossref","is-referenced-by-count":42,"title":["Evaluation of the magnitude and location of Cam deformity using three dimensional CT analysis"],"prefix":"10.1302","volume":"96-B","author":[{"given":"O.","family":"Khan","sequence":"first","affiliation":[{"name":"University College London Hospitals, 250 Euston Rd, London, NW1 2PG, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"J.","family":"Witt","sequence":"additional","affiliation":[{"name":"University College London Hospitals, 250 Euston Rd, London, NW1 2PG, UK."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"42","reference":[{"key":"r1","doi-asserted-by":"crossref","first-page":"112","DOI":"10.1097\/01.blo.0000096804.78689.c2","volume":"417","author":"Ganz R","year":"2003","journal-title":"Clin Orthop Relat Res"},{"key":"r2","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.84B4.0840556"},{"key":"r3","doi-asserted-by":"publisher","DOI":"10.1097\/rmr.0b013e3180421caf"},{"key":"r4","doi-asserted-by":"publisher","DOI":"10.1097\/00005131-200109000-00003"},{"key":"r5","doi-asserted-by":"publisher","DOI":"10.1097\/01.blo.0000201168.72388.24"},{"key":"r6","doi-asserted-by":"publisher","DOI":"10.1097\/BLO.0b013e3180f60b53"},{"key":"r7","doi-asserted-by":"publisher","DOI":"10.1148\/radiol.2403050767"},{"key":"r8","doi-asserted-by":"publisher","DOI":"10.1016\/j.orthres.2005.03.011"},{"key":"r9","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.J.01280"},{"key":"r10","doi-asserted-by":"publisher","DOI":"10.3109\/17453671003619011"},{"key":"r11","doi-asserted-by":"publisher","DOI":"10.1016\/j.arthro.2008.01.010"},{"key":"r12","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-008-0626-4"},{"key":"r13","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.92B1.22359"},{"key":"r14","doi-asserted-by":"publisher","DOI":"10.2214\/AJR.06.0921"},{"key":"r15","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-011-1945-4"},{"key":"r16","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.83B2.0830171"},{"key":"r17","doi-asserted-by":"publisher","DOI":"10.1016\/j.arthro.2004.12.011"},{"key":"r18","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-012-2331-6"},{"key":"r19","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.87B7.15203"},{"key":"r20","doi-asserted-by":"publisher","DOI":"10.1097\/01241398-199401000-00011"},{"key":"r21","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-010-1539-6"},{"key":"r22","doi-asserted-by":"publisher","DOI":"10.2106\/JBJS.H.01199"},{"key":"r23","doi-asserted-by":"publisher","DOI":"10.1097\/00003086-200401000-00010"},{"key":"r24","doi-asserted-by":"publisher","DOI":"10.1007\/s11999-010-1447-9"},{"key":"r25","doi-asserted-by":"publisher","DOI":"10.1016\/j.arthro.2011.10.021"},{"key":"r26","doi-asserted-by":"publisher","DOI":"10.1177\/0363546512441328"},{"key":"r27","doi-asserted-by":"publisher","DOI":"10.1302\/0301-620X.91B8.22389"}],"container-title":["The Bone &amp; Joint Journal"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/pdf\/10.1302\/0301-620X.96B9.33555","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/full-xml\/10.1302\/0301-620X.96B9.33555","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/pdf\/10.1302\/0301-620X.96B9.33555","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2023,7,16]],"date-time":"2023-07-16T06:15:33Z","timestamp":1689488133000},"score":1,"resource":{"primary":{"URL":"https:\/\/online.boneandjoint.org.uk\/doi\/10.1302\/0301-620X.96B9.33555"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2014,9]]},"references-count":27,"journal-issue":{"issue":"9","published-print":{"date-parts":[[2014,9]]}},"alternative-id":["10.1302\/0301-620X.96B9.33555"],"URL":"https:\/\/doi.org\/10.1302\/0301-620x.96b9.33555","relation":{},"ISSN":["2049-4394","2049-4408"],"issn-type":[{"value":"2049-4394","type":"print"},{"value":"2049-4408","type":"electronic"}],"subject":[],"published":{"date-parts":[[2014,9]]},"assertion":[{"value":"2013-11-22","order":0,"name":"received","label":"Received","group":{"name":"publication_history","label":"Publication History"}},{"value":"2014-05-30","order":2,"name":"accepted","label":"Accepted","group":{"name":"publication_history","label":"Publication History"}},{"value":"2014-09-01","order":3,"name":"published","label":"Published","group":{"name":"publication_history","label":"Publication History"}}]}}