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We assessed femoral head\/neck offset in 63 hips undergoing metal-on-metal hip resurfacing and in 56 hips presenting with non-arthritic pain secondary to femoroacetabular impingement. Most hips undergoing resurfacing (57%; 36) had an offset ratio \u2264 0.15 pre-operatively and required greater correction of offset at operation than the rest of the group. In the non-arthritic hips the mean offset ratio was 0.137 (0.04 to 0.23), with the offset ratio correlating negatively to an increasing \u03b1 angle. An offset ratio \u2264 0.15 had a 9.5-fold increased relative risk of having an \u03b1 angle \u2265 50.5\u00b0. Most hips undergoing resurfacing have an abnormal femoral head\/neck offset, which is best assessed in the sagittal plane.<\/jats:p>","DOI":"10.1302\/0301-620x.89b1.18011","type":"journal-article","created":{"date-parts":[[2007,1,26]],"date-time":"2007-01-26T20:35:05Z","timestamp":1169843705000},"page":"9-15","source":"Crossref","is-referenced-by-count":75,"title":["The femoral head\/neck offset and hip resurfacing"],"prefix":"10.1302","volume":"89-B","author":[{"given":"P. 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