Inertial measurement units (IMUs) are commonly used for gait assessment, yet their potential for quantifying improvements in gait function and patterns after total hip arthroplasty (THA) has not been fully explored. The primary aim of this study was to compare spatiotemporal parameters and sagittal plane kinematic patterns of patients with hip osteoarthritis (OA) before and after THA, and to asymptomatic controls. The secondary aim was to assess the association between dynamic hip range of motion (ROM) during walking and the Hip Osteoarthritis Outcome Scores (HOOS). Twenty-four patients with hip OA and 24 matched asymptomatic controls completed gait analyses using the RehaGait® sensor system. Patients were evaluated pre- and 1 year postoperatively, controls in a single visit. Differences in kinematic data were analyzed using statistical parametric mapping, and correlations between dynamic hip ROM and HOOS were calculated. Walking speed and stride length significantly increased (+0.08 m/s, p = 0.019; +0.06 m, p = 0.048) after THA but did not reach the level of asymptomatic controls (−0.11 m/s, p = 0.028; −0.14 m, p = 0.001). Preoperative hip and knee kinematics differed significantly from controls. After THA, they improved significantly and did not differ from controls. Dynamic hip flexion-extension ROM correlated positively with all HOOS subscores (r > 0.417; p ≤ 0.001). The change in HOOS symptoms in patients was explained by the combination of baseline HOOS symptoms and change in dynamic hip ROM (r² = 0.748) suggesting that the additional information gained with IMU gait analysis helps to complement and objectify patient-reported outcome measures pre- and postoperatively and monitor treatment-related improvements.

中文翻译：

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使用惯性测量装置对全髋关节置换术进行功能评估：步态运动学的改善以及与患者报告的结果测量的关联

惯性测量单元 (IMU) 通常用于步态评估，但尚未充分探索其在全髋关节置换术 (THA) 后量化步态功能和模式改善的潜力。本研究的主要目的是比较髋关节骨关节炎 (OA) 患者在 THA 前后的时空参数和矢状面运动学模式，并与无症状对照者进行比较。次要目的是评估行走期间动态髋关节运动范围 (ROM) 与髋骨关节炎结果评分 (HOOS) 之间的关联。24 名髋骨关节炎患者和 24 名匹配的无症状对照者使用 RehaGait® 传感器系统完成了步态分析。患者在术前和术后 1 年接受评估，对照组在单次就诊时接受评估。使用统计参数映射分析运动学数据的差异，并计算动态髋关节 ROM 和 HOOS 之间的相关性。步行速度和步幅显着增加（+0.08 m/s，p  = 0.019；+0.06 m，p  = 0.048）在 THA 后但未达到无症状对照水平（-0.11 m/s，p  = 0.028；-0.14 m，p  = 0.001）。术前髋关节和膝关节运动学与对照组有显着差异。THA 后，他们明显改善并且与对照组没有差异。动态髋关节屈伸 ROM 与所有 HOOS 分项评分呈正相关 ( r  > 0.417; p  ≤ 0.001)。患者 HOOS 症状的变化可以通过基线 HOOS 症状和动态髋关节 ROM 变化的组合来解释 ( r ² = 0.748）表明通过 IMU 步态分析获得的额外信息有助于补充和客观化患者报告的术前和术后结果测量，并监测与治疗相关的改善。