What is the Fate of Total Hip Arthroplasty (THA) Acetabular Component Orientation When Evaluated in the Standing Position?

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• 作者：John V. Tiberi III ; MD ; Valentin Antoci ; MD ; PhD ; Henrik Malchau ; MD ; PhD ; Harry E. Rubash ; MD ; Andrew A. Freiberg ; MD ; Young-Min Kwon ; MD ; PhD
• 关键词：total hip arthroplasty ; acetabular cup position ; standing ; safe zone ; EOS X-ray imaging Acquisition System
• 刊名：The Journal of Arthroplasty
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：30
• 期：9
• 页码：1555-1560
• 全文大小：591 K

文摘

This retrospective study measured the change of the acetabular component orientation between supine and standing radiographs in 113 THA patients and identified the associated anatomical parameters that may help direct pre-operative planning. The mean change of the acetabular component inclination and version from supine to standing was 4.6° and 5.9° respectively (P < 0.0001), with 49 (43%) hips showing inclination change > 5° and 69 (53%) hips showing version change > 5°. Twelve (43%) of 28 ‘malpositioned’ cups became ‘well-positioned’ and 26 (31%) of 85 ‘well-positioned’ cups became ‘malpositioned’ upon standing. Changes in inclination were associated with leg length discrepancy and pelvic obliquity; and changes in version were associated with pelvic tilt and pelvic incidence. Standing position and patient factors should be considered when defining “optimal” acetabular orientation.