Are Morbidly Obese Patients Undergoing Total Hip Arthroplasty at an Increased Risk For Component Malpositioning?

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• 作者：Leah C. Elson ; Christopher J. Barr ; Shaun E. Ch ; ran ; Viktor Johannes Hansen ; Henrik Malchau ; Young-Min Kwon
• 关键词：obesity ; total hip arthroplasty ; component malpositioning
• 刊名：The Journal of Arthroplasty
• 出版年：2013
• 出版时间：September, 2013
• 年：2013
• 卷：28
• 期：8_supp_S
• 页码：41-44
• 全文大小：375 K

文摘

Acetabular cup positioning is a critical factor in determining adverse clinical outcomes in THA. This evaluation was performed to determine if morbid obesity (BMI ¡Ý 35 kg/m²) is a contributing risk factor to cup malpositioning. Two groups of patients were obtained from a local arthroplasty registry and match-controlled for gender, age, and diagnosis (n = 211 morbidly obese; n = 211 normal). Intraoperative data and postoperative AP pelvis and cross-table lateral radiographs were obtained for each patient. The Martell Hip Analysis Suite was used to calculate cup positioning (successful positioning defined as 30¡ã-45¡ã of abduction, and 5¡ã-25¡ã of anteversion), as well as varus-valgus alignment of the femoral stem. There was a significant correlation between morbid obesity with respect to underanteversion; using multivariate analysis, there was a trend toward a combined underanteversion/overabduction of the acetabular cup. Of all variables considered, high BMI was the most significant risk factor leading to malpositioning.