Background

The popularity of inertial sensors in gait analysis is steadily rising. To date, an application of a wearable inertial sensor system for assessing gait in hip osteoarthritis (OA) has not been reported.

Research question: Can the known kinematic differences between patients with hip OA and asymptomatic control subjects be measured using the inertial sensor system RehaGait®?

Methods

The patients group consisted of 22 patients with unilateral hip OA scheduled for total hip replacement. Forty-five age matched healthy control subjects served as control group. All subjects walked for a distance of 20 m at their self-selected speed. Spatiotemporal parameters and sagittal kinematics at the hip, knee, and ankle including range of motion (ROM) were measured using the RehaGait® system.

Results

Patients with hip OA walked at a slower walking speed (−0.18 m/s, P < 0.001) and with shorter stride length (−0.16 m, P < 0.001), smaller hip ROM during stance (−11.6°, P < 0.001) and swing (−11.3°, P < 0.001) and smaller knee ROM during terminal stance and swing (−9.0° and−11.5°, P < 0.001). Patients had a smaller hip ROM during stance and swing and smaller knee ROM during terminal stance and swing in the affected compared to the unaffected side (P < 0.001).

Significance

The differences in spatiotemporal and kinematic gait parameters between patients with hip OA and age matched control subjects assessed using the inertial sensor system agree with those documented for camera-based systems. Hence, the RehaGait® system can measure gait kinematics characteristic for hip OA, and its use in daily clinical practice is feasible.

中文翻译：

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使用可穿戴式传感器测量重度髋骨关节炎患者的步态运动学。

背景

惯性传感器在步态分析中的应用正在稳步上升。迄今为止，尚未报道可穿戴惯性传感器系统在髋骨关节炎（OA）中评估步态的应用。

研究问题：可以使用惯性传感器系统RehaGait®来测量髋骨OA患者和无症状对照对象之间的已知运动学差异吗？

方法

患者组包括22例单侧髋骨OA患者，计划进行全髋关节置换。45岁年龄相匹配的健康对照组作为对照组。所有受试者均以自己选择的速度行走20 m。使用RehaGait®系统测量了髋，膝和踝的时空参数和矢状运动学，包括运动范围（ROM）。

结果

髋骨OA患者的行走速度较慢（−0.18 m / s，P <0.001），步幅较短（−0.16 m，P <0.001），站立时髋部ROM较小（−11.6°，P <0.001）在终端姿态和挥杆期间，挥杆（-11.3°，P <0.001）和较小的膝盖ROM（-9.0°和-11.5°，P <0.001）。与未受影响的一侧相比，患者在站立和摆动期间的髋部ROM较小，而在最终站立和摆动期间的患者的ROM较小（P <0.001）。

意义

使用惯性传感器系统评估的髋骨OA患者与年龄匹配的对照受试者之间的时空和运动步态参数差异与基于摄像头的系统所记录的一致。因此，RehaGait®系统可以测量髋骨OA的步态运动学特征，并且在日常临床实践中使用它是可行的。