{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,8]],"date-time":"2026-01-08T21:33:01Z","timestamp":1767907981531,"version":"3.49.0"},"reference-count":41,"publisher":"Oxford University Press (OUP)","issue":"1","license":[{"start":{"date-parts":[[2022,3,9]],"date-time":"2022-03-09T00:00:00Z","timestamp":1646784000000},"content-version":"vor","delay-in-days":67,"URL":"https:\/\/creativecommons.org\/licenses\/by-nc\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["81573996"],"award-info":[{"award-number":["81573996"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["81873327"],"award-info":[{"award-number":["81873327"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["82004392"],"award-info":[{"award-number":["82004392"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2022,5,25]]},"abstract":"<jats:title>ABSTRACT<\/jats:title>\n               <jats:p>Load-bearing capacity of the bone structures of anterolateral weight-bearing area plays an important role in the progressive collapse in osteonecrosis of the femoral head (ONFH). The purpose of this study is to assess the efficacy of combined evaluation of anteroposterior (AP) and frog-leg lateral (FLL) view in diagnosing collapse. Between December 2016 and August 2018, a total of 478 hips from 372 patients with ONFH (268 male, 104 female; mean age 37.9\u2009\u00b1\u200911.4\u2009years) were retrospectively evaluated. All patients received standard AP and FLL views of hip joints. Japanese Investigation Committee (JIC) classification system was used to classify necrotic lesion in AP view. Anterior necrotic lesion was evaluated by FLL view. All patients with pre-collapse ONFH underwent non-operative hip-preserving therapy. The collapse rates were calculated and compared with Kaplan\u2013Meier survival analysis with radiological collapse as endpoints. Forty-four (44\/478, 9.2%) hips were classified as type A, 65 (65\/478, 13.6%) as type B, 232 (232\/478, 48.5%) as type C1 and 137 (137\/478, 28.7%) as type C2. Three hundred cases (300\/478, 62.5%) were collapsed at the initial time point. Two hundred and twenty six (226\/300, 75.3%) hips and 298 (298\/300, 99.3%) hips collapse were identified with AP view and FLL view, respectively. An average follow-up of 37.0\u2009\u00b1\u200932.0\u2009months was conducted to evaluate the occurrence of collapse in 178 pre-collapse hips. Collapses occurred in 89 hips (50.0%). Seventy-seven (77\/89, 86.5%) hips were determined with AP view alone and 85 (85\/89, 95.5%) hips were determined with the combination of AP and FLL views. The collapse rates at five years were reported as 0% and 0%, 16.2% and 24.3%, 58.3% and 68.1% and 100% and 100% according to AP view alone or combination of AP and FLL views for types A, B, C1 and C2, respectively. The collapse can be diagnosed more accurately by combination of AP and FLL views. Besides, JIC type A and type B ONFH can be treated with conservative hip preservation, but pre-collapse type C2 ONFH should be treated with joint-preserving surgery. Type C1 needs further study to determine which subtype has potential risk of collapse.<\/jats:p>","DOI":"10.1093\/jhps\/hnac006","type":"journal-article","created":{"date-parts":[[2022,3,9]],"date-time":"2022-03-09T15:36:55Z","timestamp":1646840215000},"page":"10-17","source":"Crossref","is-referenced-by-count":11,"title":["Combining frog-leg lateral view may serve as a more sensitive X-ray position in monitoring collapse in osteonecrosis of the femoral head"],"prefix":"10.1093","volume":"9","author":[{"given":"Qiu-Shi","family":"Wei","sequence":"first","affiliation":[{"name":"Joint Center, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"},{"name":"Guangdong Research Institute for Orthopedics & Traumatology of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6849-3679","authenticated-orcid":false,"given":"Min-Cong","family":"He","sequence":"additional","affiliation":[{"name":"Guangdong Research Institute for Orthopedics & Traumatology of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiao-Ming","family":"He","sequence":"additional","affiliation":[{"name":"Guangdong Research Institute for Orthopedics & Traumatology of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tian-Ye","family":"Lin","sequence":"additional","affiliation":[{"name":"Guangdong Research Institute for Orthopedics & Traumatology of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Peng","family":"Yang","sequence":"additional","affiliation":[{"name":"Guangdong Research Institute for Orthopedics & Traumatology of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhen-Qiu","family":"Chen","sequence":"additional","affiliation":[{"name":"No. 3 Orthopaedic Region, The First Affiliated Hospital of Guangzhou University of Chinese Medicine , No. 16, Jichang Road, Baiyun District, Guangzhou 510407, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qing-Wen","family":"Zhang","sequence":"additional","affiliation":[{"name":"Joint Center, The Third Affiliated Hospital of Guangzhou University of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"},{"name":"Guangdong Research Institute for Orthopedics & Traumatology of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei","family":"He","sequence":"additional","affiliation":[{"name":"Guangdong Research Institute for Orthopedics & Traumatology of Chinese Medicine , No. 261, Longxi Road, Liwan District, Guangzhou 510378, P.R. China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"286","published-online":{"date-parts":[[2022,3,9]]},"reference":[{"key":"2022052721402147600_R1","doi-asserted-by":"crossref","first-page":"1723","DOI":"10.1007\/s00264-018-3917-8","article-title":"Early-stage osteonecrosis of the femoral head: where are we and where are we going in year 2018?","volume":"42","author":"Larson","year":"2018","journal-title":"Int Orthop"},{"key":"2022052721402147600_R2","doi-asserted-by":"crossref","first-page":"458","DOI":"10.1093\/jhps\/hnaa059","article-title":"Arthroscopic assessment of concomitant intraarticular pathologies in patients with osteonecrosis of the femoral head","volume":"7","author":"Serong","year":"2021","journal-title":"J Hip Preserv Surg"},{"key":"2022052721402147600_R3","doi-asserted-by":"crossref","first-page":"2843","DOI":"10.4103\/0366-6999.168017","article-title":"Prevalence of nontraumatic osteonecrosis of the femoral head and its associated risk factors in the chinese population: results from a nationally representative survey","volume":"128","author":"Zhao","year":"2015","journal-title":"Chin Med J"},{"key":"2022052721402147600_R4","doi-asserted-by":"crossref","first-page":"2342","DOI":"10.1016\/j.arth.2020.04.092","article-title":"Diagnosis of osteonecrosis of the femoral head: too little, too late, and independent of etiology","volume":"35","author":"Boontanapibul","year":"2020","journal-title":"J Arthroplasty"},{"key":"2022052721402147600_R5","doi-asserted-by":"crossref","first-page":"1084","DOI":"10.2106\/JBJS.19.01271","article-title":"Nontraumatic osteonecrosis of the femoral head: where do we stand today?: a 5-year update","volume":"102","author":"Mont","year":"2020","journal-title":"J Bone Joint Surg Am"},{"key":"2022052721402147600_R6","doi-asserted-by":"crossref","first-page":"130","DOI":"10.1016\/S0736-0266(01)00063-8","article-title":"Significance of lesion size and location in the prediction of collapse of osteonecrosis of 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