{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,1]],"date-time":"2026-03-01T03:46:41Z","timestamp":1772336801531,"version":"3.50.1"},"reference-count":23,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2023,11,20]],"date-time":"2023-11-20T00:00:00Z","timestamp":1700438400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004700","name":"Taipei Medical University","doi-asserted-by":"publisher","award":["TMU109\u2010Y05\u2010E173"],"award-info":[{"award-number":["TMU109\u2010Y05\u2010E173"]}],"id":[{"id":"10.13039\/501100004700","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100004700","name":"Taipei Medical University","doi-asserted-by":"publisher","award":["TMU111\u2010F\u2010009"],"award-info":[{"award-number":["TMU111\u2010F\u2010009"]}],"id":[{"id":"10.13039\/501100004700","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Orthopaedic Surgery"],"published-print":{"date-parts":[[2024,1]]},"abstract":"<jats:p>Improper acetabulum component position is a significant risk factor for postoperative dislocation after total hip arthroplasty. Several radiographic two\u2010dimensional methods exist for measuring acetabulum component anteversion, but they cannot distinguish between anteversion and retroversion. \u201cLiaw's version,\u201d initially proposed as a simple mathematical standardized two\u2010dimensional method, was modified to the computerized ellipse method, proving superior accuracy to traditional two\u2010dimensional methods. In this article, we demonstrated its application in detecting and measuring retroverted acetabulum component. We obtained anteroposterior pelvis radiographs from a patient undergoing total hip arthroplasty on the day of surgery and 2\u2009weeks postoperatively. The computerized ellipse method was used to measure the acetabulum component orientation. Upon comparison, the difference between \u03b8 assigned to be retroverted (9.52\u20138.56\u2009=\u20090.96) is much smaller than the difference between \u03b8 assigned to be anteverted (23.81\u201318.86\u2009=\u20094.95), leading us to determine retroversion. This was further confirmed by computed tomography at the 6\u2010week follow\u2010up. We propose that using the computerized ellipse method to measure Liaw's version can be a valuable tool in identifying acetabulum component retroversion on anteroposterior radiographs during routine postoperative follow\u2010up and retrospective assessments of total hip arthroplasty patients.<\/jats:p>","DOI":"10.1111\/os.13902","type":"journal-article","created":{"date-parts":[[2023,11,21]],"date-time":"2023-11-21T22:23:29Z","timestamp":1700605409000},"page":"276-281","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Liaw's Ellipse Anteversion Method for Distinguishing Acetabular Component Retroversion from Anteversion on Plain Radiographs"],"prefix":"10.1111","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1752-2644","authenticated-orcid":false,"given":"Chun\u2010Hao","family":"Lin","sequence":"first","affiliation":[{"name":"Department of Orthopaedics, Shuang Ho Hospital Taipei Medical University  New Taipei Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei\u2010Cheng","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics, Shuang Ho Hospital Taipei Medical University  New Taipei Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pei\u2010Wei","family":"Weng","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics, Shuang Ho Hospital Taipei Medical University  New Taipei Taiwan"},{"name":"Department of Orthopaedics, School of Medicine, College of Medicine Taipei Medical University  Taipei Taiwan"},{"name":"International PhD Program in Biomedical Engineering, College of Biomedical Engineering Taipei Medical University  Taipei Taiwan"},{"name":"Research Center of Biomedical Devices Taipei Medical University  Taipei Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yu\u2010min","family":"Huang","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics, Shuang Ho Hospital Taipei Medical University  New Taipei Taiwan"},{"name":"Department of Orthopaedics, School of Medicine, College of Medicine Taipei Medical University  Taipei Taiwan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3159-8450","authenticated-orcid":false,"given":"Chen\u2010Kun","family":"Liaw","sequence":"additional","affiliation":[{"name":"Department of Orthopaedics, Shuang Ho Hospital Taipei Medical University  New Taipei Taiwan"},{"name":"Department of Orthopaedics, School of Medicine, College of Medicine Taipei Medical University  Taipei Taiwan"},{"name":"Research Center of Biomedical Device College of Biomedical Engineering, Graduate Institute of Biomedical Optomechatronics, Taipei Medical University  Taipei Taiwan"},{"name":"TMU Biodesign Center Taipei Medical University  Taipei 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