Huffman Kyle D, Sanford Brooke A, Zucker-Levin Audrey R, Williams John L, Mihalko William M
Department of Biomedical Engineering, University of Memphis, 330 Engineering Technology Building, University of Memphis, Memphis, TN 38152, USA.
Department of Physical Therapy, University of Tennessee Health Science Center, 930 Madison #C014, Memphis, TN 38163, USA.
Gait Posture. 2015 Feb;41(2):640-5. doi: 10.1016/j.gaitpost.2015.01.014. Epub 2015 Jan 21.
Obesity is associated with increased risk of total hip arthroplasty (THA) dislocation. Differences in kinematics and kinetics at the hip during activities of daily living such as sit-to-stand (STS) may contribute to this risk. Nine high body mass index (BMI) subjects (mean BMI 31.2) and ten normal BMI control subjects (mean BMI 22.1) were analyzed using force plates and an optoelectronic motion capture camera system during controlled STS movement. Flexion/extension, abduction/adduction, and internal/external rotation angles and moments at the hip and knee were calculated using a musculoskeletal model. No differences were found at the knee. Peak hip abduction angles were on average 50% greater in the high BMI group compared to the normal group (p=0.038). The hip was roughly 50% more abducted throughout the entire STS cycle in the high BMI group. Peak normalized hip abduction moments were approximately twice as large in the high BMI group (p=0.005). Further research is required to determine if this increase in abduction angle and moment observed during STS is a contributor to risk for complications following THA in obese subjects.
肥胖与全髋关节置换术（THA）脱位风险增加相关。在诸如从坐起到站立（STS）等日常生活活动中，髋关节的运动学和动力学差异可能导致这种风险。在受控的STS运动过程中，使用测力板和光电运动捕捉摄像系统对9名高体重指数（BMI）受试者（平均BMI 31.2）和10名正常BMI对照受试者（平均BMI 22.1）进行了分析。使用肌肉骨骼模型计算髋关节和膝关节的屈伸、外展/内收以及内外旋转角度和力矩。在膝关节处未发现差异。高BMI组的髋关节外展峰值角度平均比正常组大50%（p = 0.038）。在整个STS周期中，高BMI组的髋关节外展程度大致比正常组多50%。高BMI组的归一化髋关节外展峰值力矩约为正常组的两倍（p = 0.005）。需要进一步研究以确定在STS过程中观察到的外展角度和力矩增加是否是肥胖受试者THA后并发症风险的一个促成因素。
