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Tsai CJ, Yang ZY, Wu TY, Tsai YT, Wang JJ, Liaw CK. The Transverse Mechanical Axis of the Pelvis for Post-Operative Evaluation of Total Hip Arthroplasty. Biomedicines 2023; 11:biomedicines11051397. [PMID: 37239066 DOI: 10.3390/biomedicines11051397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/12/2023] [Accepted: 05/01/2023] [Indexed: 05/28/2023] Open
Abstract
Currently, orthopedic surgeons mainly use the inter-teardrop line (IT-line) as the transverse mechanical axis of the pelvis (TAP) for postoperative evaluation of total hip arthroplasty (THA). However, the teardrop is often unclear in the pelvis anteroposterior (AP) radiographs, which makes postoperative evaluation of THA difficult. In this study, we attempted to identify other clear and accurate axes for postoperative evaluation of THA. We calculated the mean and standard deviation of these angles and tested the significance of these angles using t-tests. The inter-teardrops line (IT line) and the upper rim of the obturator foramen (UOF) had smaller angles with the IFH line. The bi-ischial line (BI line) was relatively inaccurate in measurements. We recommend using the IT line as the TAP when the lower boundary of the teardrops is clear and the shapes of the teardrops on both sides of the pelvis are symmetrical. When there is no deformation of the obturator foramen on pelvic AP radiographs, the UOF is also a good choice for the TAP. We do not recommend the BI line as the TAP.
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Affiliation(s)
- Cheng-Jui Tsai
- School of Medicine, College of Medicine, Taipei Medical University, Taipei City 11031, Taiwan
| | - Zong-Yan Yang
- School of Medicine, College of Medicine, Taipei Medical University, Taipei City 11031, Taiwan
| | - Tai-Yin Wu
- Department of Family Medicine, Zhongxing Branch, Taipei City Hospital, Taipei City 10341, Taiwan
- Institute of Epidemiology and Preventive Medicine, National Taiwan University, Taipei City 10055, Taiwan
- General Education Center, University of Taipei, Taipei City 10023, Taiwan
| | - Ya-Ting Tsai
- School of Medicine, China Medical University, Taichung City 404333, Taiwan
| | - Juyn-Jhe Wang
- School of Medicine, College of Medicine, Taipei Medical University, Taipei City 11031, Taiwan
| | - Chen-Kun Liaw
- Department of Orthopedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei City 11031, Taiwan
- Department of Orthopedics, Shuang Ho Hospital, Taipei Medical University, No. 291, Zhongzheng Rd., Zhonghe Dist, New Taipei City 23561, Taiwan
- Research Center of Biomedical Device, College of Biomedical Engineering, Graduate Institute of Biomedical Optomechatronics, Taipei Medical University, Taipei City 11031, Taiwan
- TMU Biodesign Center, Taipei Medical University, Taipei 11031, Taiwan
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