PURPOSE The present study aimed to compare the capabilities of preoperative usual and maximal gait speeds in predicting functional recovery in patients who have undergone total hip arthroplasty (THA). METHODS Primary and unilateral THAs were performed in 317 patients, and the proportion of patients who achieved unassisted walking (functional recovery) 5 days postoperatively was recorded as an outcome measure. Preoperative functional assessment included hip pain, leg muscle strength, range of motion (ROM), and gait speed evaluations. The capabilities of preoperative usual and maximal gait speeds in predicting functional recovery were compared based on the areas under the curves (AUCs) of receiver operating characteristic (ROC) curves. Further, ROC curves were constructed using two models: 1. a model of gait speed only and 2. a clinical model including age, sex, leg muscle strength, and ROM. RESULTS On the AUCs for predictive ability of functional recovery, maximal gait speed was greater than usual gait speed (0.66 and 0.70, respectively). The AUC for maximal gait speed was as large as that of the clinical model (0.70 and 0.70, respectively). CONCLUSION Our results suggest that maximal gait speed is a simple and useful prognostic indicator of functional recovery in patients who have undergone THA.

中文翻译：

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最大步态速度是全髋关节置换术后功能恢复的简单而有用的预后指标。

目的本研究旨在比较术前通常和最大步态速度预测全髋关节置换术（THA）患者功能恢复的能力。方法317例患者进行了原发性和单侧THA治疗，并记录了术后5天无辅助行走（功能恢复）患者的比例。术前功能评估包括髋关节疼痛，腿部肌肉力量，运动范围（ROM）和步态速度评估。根据受试者工作特征（ROC）曲线的曲线下面积（AUC），比较术前通常的步态速度和最大步态速度预测功能恢复的能力。此外，使用两个模型构建ROC曲线：1.仅步态速度模型；以及2。一种临床模型，包括年龄，性别，腿部肌肉力量和ROM。结果在用于功能恢复预测能力的AUC上，最大步态速度大于通常的步态速度（分别为0.66和0.70）。最大步态速度的AUC与临床模型的AUC一样大（分别为0.70和0.70）。结论我们的研究结果表明，最大步态速度是接受THA的患者功能恢复的简单而有用的预后指标。