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A better understanding of DDH related changes will have positive repercussions toward hip soft tissue reconstruction.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>19 adult patients with unilateral DDH scheduled for total hip arthroplasty were assessed for: cross-sectional area (CSA), radiological density (RD) and the length of gluteus medius using computed tomograhpy(CT) (scanned before THA). Hip abductor moment arm and gluteus medius activation angle were also measured<jats:italic>via<\/jats:italic>hip anteroposterior radiographs.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Both CSA and RD of gluteus medius muscle were significantly reduced (p\u2009&lt;\u20090.05) in the affected hip compared to the control. In the affected hip, the length of the gluteus medius muscle was reduced by 8-11\u2009% (p\u2009&lt;\u20090.05) while the gluteus medius activation angle was significantly increased (p\u2009&lt;\u20090.05) and the hip abductor moment arm was decreased (p\u2009&lt;\u20090.05).<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>The gluteus medius showed substantial loss of CSA, RD as well as decreased length in patients with DDH in the affected hip. These changes should be considered in both hip reconstruction and postoperative rehabilitation training in patients with DDH.<\/jats:p><\/jats:sec>","DOI":"10.1186\/1471-2474-13-101","type":"journal-article","created":{"date-parts":[[2012,8,15]],"date-time":"2012-08-15T12:14:27Z","timestamp":1345032867000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":58,"title":["Changes of gluteus medius muscle in the adult patients with unilateral developmental dysplasia of the hip"],"prefix":"10.1186","volume":"13","author":[{"given":"RuiYu","family":"Liu","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"XiaoDong","family":"Wen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ZhiQin","family":"Tong","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"KunZheng","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"ChunSheng","family":"Wang","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2012,6,15]]},"reference":[{"issue":"3","key":"1406_CR1","doi-asserted-by":"publisher","first-page":"969","DOI":"10.1148\/radiol.2353040403","volume":"235","author":"CW Pfirrmann","year":"2005","unstructured":"Pfirrmann CW, Notzli HP, Dora C, Hodler J, Zanetti M: Abductor tendons and muscles assessed at MR imaging after total hip arthroplasty in asymptomatic and symptomatic patients. 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