{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T12:43:30Z","timestamp":1756385010634,"version":"3.44.0"},"reference-count":8,"publisher":"BMJ","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["BMJ Case Reports"],"abstract":"<jats:p>We report the presence of an unusual radiological feature of formation of pseudoacetabulum in a chronically dislocated and asymptomatic total hip arthroplasty. An elderly demented patient with a history of recurrent dislocations presented to us after an unwitnessed fall and leg length discrepancy. Radiographs showed a dislocated hip arthroplasty with a well-defined, concentric, radio-opaque shadow around the dislocated femoral head suggestive of a pseudoacetabulum. Previous radiographs revealed formation of heterotopic ossification in the soft tissues surrounding the hip. The dislocated joint was reduced under a general anaesthetic with difficulty. This case highlights the presence of heterotopic ossification and formation of pseudoacetabulum as subtle radiological features of chronic instability and dislocation.<\/jats:p>","DOI":"10.1136\/bcr-2012-006686","type":"journal-article","created":{"date-parts":[[2012,10,8]],"date-time":"2012-10-08T07:24:02Z","timestamp":1349681042000},"page":"bcr2012006686","source":"Crossref","is-referenced-by-count":3,"title":["Pseudoacetabulum a subtle radiological feature of a chronic dislocated total hip replacement"],"prefix":"10.1136","volume":"2012","author":[{"given":"Saurabh","family":"Odak","sequence":"first","affiliation":[{"name":"Royal Liverpool University Hospital, Warrington, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jitendra","family":"Mangwani","sequence":"additional","affiliation":[{"name":"Department of Trauma & Orthopaedics, Leicester Royal Infirmary, Leicester, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"John","family":"Ivory","sequence":"additional","affiliation":[{"name":"Great Western Hospital, Swindon, UK"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2012,10,8]]},"reference":[{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.1","doi-asserted-by":"publisher","DOI":"10.3121\/cmr.2008.770"},{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.2","doi-asserted-by":"crossref","first-page":"1295","DOI":"10.2106\/00004623-198264090-00004","article-title":"Dislocations after total hip arthroplasty","volume":"64A","author":"Woo","year":"1982","journal-title":"J Bone Joint Surg"},{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.3","doi-asserted-by":"crossref","first-page":"832","DOI":"10.2106\/00004623-198567060-00002","article-title":"Late dislocations in patients with Charnley total hip arthroplasty","volume":"67","author":"Coventry","year":"1985","journal-title":"J Bone Joint Surg Am"},{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.4","doi-asserted-by":"crossref","first-page":"895","DOI":"10.4076\/1752-1947-3-8956","article-title":"Chronic asymptomatic dislocation of a total hip replacement: a case report","volume":"3","author":"Lidder","year":"2009","journal-title":"J Med Case Rep"},{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.5","doi-asserted-by":"crossref","first-page":"1334","DOI":"10.2106\/00004623-199274090-00006","article-title":"Operative correction of an unstable total hip arthroplasty","volume":"74","author":"Daly","year":"1992","journal-title":"J Bone Joint Surg Am"},{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.6","doi-asserted-by":"publisher","DOI":"10.1097\/01.blo.0000218751.14989.a6"},{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.7","doi-asserted-by":"publisher","DOI":"10.1080\/00016470410004049"},{"key":"2025082805124578000_2012.oct04_1.bcr2012006686.8","doi-asserted-by":"crossref","first-page":"207","DOI":"10.3109\/17453679708996686","article-title":"Patient-related risk factors for early revision of total hip replacements. A population register-based case-control study of 674 revised hips","volume":"68","author":"Espehaug","year":"1997","journal-title":"Acta Orthop Scand"}],"container-title":["BMJ Case Reports"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/syndication.highwire.org\/content\/doi\/10.1136\/bcr-2012-006686","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,8,28]],"date-time":"2025-08-28T12:12:56Z","timestamp":1756383176000},"score":1,"resource":{"primary":{"URL":"https:\/\/casereports.bmj.com\/lookup\/doi\/10.1136\/bcr-2012-006686"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2012,10,8]]},"references-count":8,"alternative-id":["10.1136\/bcr-2012-006686"],"URL":"https:\/\/doi.org\/10.1136\/bcr-2012-006686","relation":{},"ISSN":["1757-790X"],"issn-type":[{"type":"electronic","value":"1757-790X"}],"subject":[],"published":{"date-parts":[[2012,10,8]]}}}