Department of Physiotherapy, Faculty of Medicine, Dentistry and Health Sciences, The University of Melbourne, Melbourne, Australia.
Gait Posture. 2012 Jul;36(3):372-7. doi: 10.1016/j.gaitpost.2012.03.033. Epub 2012 May 23.
Clinically feasible methods of assessing postural control such as timed standing balance and functional reach tests provide important information, however, they cannot accurately quantify specific postural control mechanisms. The Microsoft Kinect™ system provides real-time anatomical landmark position data in three dimensions (3D), and given that it is inexpensive, portable and simple to setup it may bridge this gap. This study assessed the concurrent validity of the Microsoft Kinect™ against a benchmark reference, a multiple-camera 3D motion analysis system, in 20 healthy subjects during three postural control tests: (i) forward reach, (ii) lateral reach, and (iii) single-leg eyes-closed standing balance. For the reach tests, the outcome measures consisted of distance reached and trunk flexion angle in the sagittal (forward reach) and coronal (lateral reach) planes. For the standing balance test the range and deviation of movement in the anatomical landmark positions for the sternum, pelvis, knee and ankle and the lateral and anterior trunk flexion angle were assessed. The Microsoft Kinect™ and 3D motion analysis systems had comparable inter-trial reliability (ICC difference=0.06±0.05; range, 0.00-0.16) and excellent concurrent validity, with Pearson's r-values >0.90 for the majority of measurements (r=0.96±0.04; range, 0.84-0.99). However, ordinary least products analyses demonstrated proportional biases for some outcome measures associated with the pelvis and sternum. These findings suggest that the Microsoft Kinect™ can validly assess kinematic strategies of postural control. Given the potential benefits it could therefore become a useful tool for assessing postural control in the clinical setting.
评估姿势控制的临床可行方法，如定时站立平衡和功能伸展测试，提供了重要信息，但是，它们无法准确量化特定的姿势控制机制。微软 Kinect™系统以三维（3D）形式提供实时解剖学标志位置数据，而且由于其价格低廉、便携且易于设置，因此可能会弥补这一空白。本研究在 20 名健康受试者中评估了 Microsoft Kinect™与基准参考（多摄像机 3D 运动分析系统）在三种姿势控制测试中的同时效度：（i）向前伸展，（ii）侧向伸展和（iii）单腿闭眼站立平衡。对于伸展测试，结果测量包括在矢状面（向前伸展）和冠状面（侧向伸展）上达到的距离和躯干屈曲角度。对于站立平衡测试，评估了胸骨、骨盆、膝盖和脚踝的解剖学标志位置的运动范围和偏差，以及躯干前侧和侧面的屈曲角度。Microsoft Kinect™和 3D 运动分析系统具有可比的试验间可靠性（ICC 差值=0.06±0.05；范围，0.00-0.16）和极好的同时效度，大多数测量的 Pearson r 值>0.90（r=0.96±0.04；范围，0.84-0.99）。然而，普通最小二乘法分析表明，与骨盆和胸骨相关的一些结果测量存在比例偏差。这些发现表明，Microsoft Kinect™可以有效地评估姿势控制的运动策略。鉴于其潜在的益处，它可能成为评估临床姿势控制的有用工具。
