{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T14:27:17Z","timestamp":1787754437454,"version":"build-2784847793"},"reference-count":9,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"Supplement_1","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2011,3,16]]},"abstract":"<jats:sec>\n                    <jats:title>BACKGROUND:<\/jats:title>\n                    <jats:p>Advanced-stage osteonecrosis and a large area of necrotic bone are known risk factors for failure of transtrochanteric rotational osteotomy of the hip in patients with osteonecrosis. The purpose of this study was to determine whether there are other risk factors for failure of this osteotomy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>METHODS:<\/jats:title>\n                    <jats:p>One hundred and five patients (113 hips) underwent an anterior transtrochanteric rotational osteotomy for the treatment of femoral head osteonecrosis and were followed for a mean of 51.3 months postoperatively. Radiographic failure was defined as secondary collapse or osteoarthritic change. Multivariate analysis was performed to assess factors associated with secondary collapse and osteophyte formation. The Kaplan-Meier product-limit method was used to estimate survival.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>RESULTS:<\/jats:title>\n                    <jats:p>Secondary collapse occurred in twenty-seven hips (24%), and fourteen hips (12%) were converted to a total hip arthroplasty. At the time of the most recent follow-up, the hip scores according to the system of Merle d'Aubign\u00e9 et al. ranged from 6 to 18 points (mean, 15.8 points). Multivariate analysis showed that the stage of the necrosis (III or greater) (hazard ratio = 3.28; 95% confidence interval = 1.49 to 7.24), age of the patient (forty years or older) (hazard ratio = 1.08; 95% confidence interval = 1.02 to 1.14), body mass index (\u226524 kg\/m2) (hazard ratio = 1.19; 95% confidence interval = 1.03 to 1.38), and extent of the necrosis (a combined necrotic angle of \u2265230\u00b0) (hazard ratio = 1.08; 95% confidence interval = 1.04 to 1.11) were associated with secondary collapse. Seven of the eighty-six hips without collapse showed progression to osteoarthritis. The survival rate at 110 months was 63.4% (95% confidence interval = 51.1% to 75.7%) with total hip arthroplasty or radiographic failure as the end point and 56.0% (95% confidence interval = 44.6% to 67.4%) with total hip arthroplasty, radiographic failure, or loss to follow-up as the end point.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>CONCLUSIONS:<\/jats:title>\n                    <jats:p>Our study showed that age, body mass index, and the stage and extent of the osteonecrosis were determining factors for secondary collapse, unsatisfactory clinical results, and conversion to total hip arthroplasty. These factors should be considered when selecting patients for a transtrochanteric rotational osteotomy.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>LEVEL OF EVIDENCE:<\/jats:title>\n                    <jats:p>\n                      Prognostic\n                      <jats:underline>Level II<\/jats:underline>\n                      . See Instructions to Authors for a complete description of levels of evidence.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>ORIGINAL ABSTRACT CITATION:<\/jats:title>\n                    <jats:p>\u201cEffects of Age and Body Mass Index on the Results of Transtrochanteric Rotational Osteotomy for Femoral Head Osteonecrosis\u201d (2010;92:314-21).<\/jats:p>\n                  <\/jats:sec>","DOI":"10.2106\/jbjs.j.01215","type":"journal-article","created":{"date-parts":[[2011,3,16]],"date-time":"2011-03-16T13:49:14Z","timestamp":1300283354000},"page":"75-84","source":"Crossref","is-referenced-by-count":19,"title":["Effects of Age and Body Mass Index on the Results of Transtrochanteric Rotational Osteotomy for Femoral Head Osteonecrosis"],"prefix":"10.2106","volume":"93","author":[{"given":"Yong-Chan","family":"Ha","sequence":"first","affiliation":[{"name":"Department of Orthopaedic Surgery, Chung-Ang University College of Medicine, 224-1 Heukseok-dong, Dongjak-gu, Seoul 155-756, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hee Joong","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Seoul National University College of Medicine, 28 Yeongeon-dong, Jongno-gu, Seoul 110-744, South Korea. E-mail address for K.-H. Koo:"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shin-Yoon","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Kyungpook National University College of Medicine, 200 Dongduk-ro, Jung-gu, Daegu 700-721, South Korea"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ki-Choul","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Seoul National University College of Medicine, 28 Yeongeon-dong, Jongno-gu, Seoul 110-744, South Korea. E-mail address for K.-H. Koo:"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Young-Kyun","family":"Lee","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Seoul National University College of Medicine, 28 Yeongeon-dong, Jongno-gu, Seoul 110-744, South Korea. E-mail address for K.-H. Koo:"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kyung-Hoi","family":"Koo","sequence":"additional","affiliation":[{"name":"Department of Orthopaedic Surgery, Seoul National University College of Medicine, 28 Yeongeon-dong, Jongno-gu, Seoul 110-744, South Korea. E-mail address for K.-H. Koo:"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"276","reference":[{"key":"bib1-20230714","first-page":"191","article-title":"Transtrochanteric anterior rotational osteotomy of the femoral head in the treatment of osteonecrosis affecting the hip: a new osteotomy operation","volume":"130","year":"1978","journal-title":"Clin Orthop Relat Res."},{"key":"bib2-20230714","doi-asserted-by":"crossref","first-page":"83","DOI":"10.1302\/0301-620X.83B1.0830083","article-title":"Trochanteric rotational osteotomy for osteonecrosis of the femoral head","volume":"83","year":"2001","journal-title":"J Bone Joint Surg Br."},{"key":"bib3-20230714","first-page":"597","article-title":"Transtrochanteric anterior rotational osteotomy for osteonecrosis of the femoral head. Long-term results","volume":"75","year":"1993","journal-title":"J Bone Joint Surg Br."},{"key":"bib4-20230714","doi-asserted-by":"crossref","first-page":"260","DOI":"10.1007\/s00776-007-1123-4","article-title":"Use of a screw and plate system for a transtrochanteric anterior rotational osteotomy for osteonecrosis of the femoral head","volume":"12","year":"2007","journal-title":"J Orthop Sci."},{"key":"bib5-20230714","first-page":"69","article-title":"Results of transtrochanteric rotational osteotomy for nontraumatic osteonecrosis of the femoral head","volume":"228","year":"1988","journal-title":"Clin Orthop Relat Res."},{"key":"bib6-20230714","first-page":"734","article-title":"Rotational osteotomy for non-traumatic osteonecrosis of the femoral head","volume":"74","year":"1992","journal-title":"J Bone Joint Surg Br."},{"key":"bib7-20230714","doi-asserted-by":"crossref","first-page":"679","DOI":"10.1302\/0301-620X.82B5.0820679","article-title":"Anatomy of the medial femoral circumflex artery and its surgical implications","volume":"82","year":"2000","journal-title":"J Bone Joint Surg Br."},{"key":"bib8-20230714","first-page":"3","article-title":"Idiopathic bone necrosis of the femoral head. Early diagnosis and treatment","volume":"67","year":"1985","journal-title":"J Bone Joint Surg Br."},{"key":"bib9-20230714","doi-asserted-by":"crossref","first-page":"1702","DOI":"10.2106\/00004623-199611000-00010","article-title":"Interobserver reliability and intraobserver reproducibility of the modified Ficat classification system of osteonecrosis of the femoral head","volume":"78","year":"1996","journal-title":"J Bone Joint Surg Am."}],"container-title":["Journal of Bone and Joint Surgery"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.ovid.com\/00004623-201103001-00008","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,26]],"date-time":"2026-08-26T13:27:32Z","timestamp":1787750852000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.ovid.com\/00004623-201103001-00008"}},"subtitle":["Surgical Technique"],"short-title":[],"issued":{"date-parts":[[2011,3,16]]},"references-count":9,"journal-issue":{"issue":"Supplement_1","published-print":{"date-parts":[[2011]]}},"URL":"https:\/\/doi.org\/10.2106\/jbjs.j.01215","relation":{},"ISSN":["0021-9355","1535-1386"],"issn-type":[{"value":"0021-9355","type":"print"},{"value":"1535-1386","type":"electronic"}],"subject":[],"published":{"date-parts":[[2011,3,16]]}}}