Background

Stair climbing test (SCT) has been suggested as the first task affected in individuals with symptomatic knee osteoarthritis (KOA). However, there are environmental barriers for the execution of the 9- to 12-step SCT. Thus, we developed a feasible one-step SCT that could be completed in 15s.

Objective

To check the clinimetric properties of the 15s Step Up and Down (StUD) test in individuals with KOA.

Design

Prospective validity study.

Method

Eighty-two individuals with KOA participated in this study. The test-retest reliability of the StUD test was measured with a 1-week interval. The construct validity and responsiveness were assessed by testing predefined hypotheses. For this, the 30s Chair Stand Test (30CS), Timed Up and Go Test (TUG), quadriceps strength, Knee Injury and Osteoarthritis Outcome Score (KOOS), and Lequesne Algofunctional Index were used as comparator instruments.

Results

The StUD test presented good test-retest reliability (ICC = 0.87; 95% CI = 0.79–0.91) and showed a moderate to good correlation with the 30CS (r = 0.65), TUG (r = −0.56), and quadriceps strength (r = 0.41). We found a higher correlation between the StUD test and the performance-based tests than the patient-reported outcome measures. The StUD test was responsive, with five out of the six (83.3%) hypotheses confirmed.

Conclusion

StUD test showed good reliability, adequate validity and responsiveness. Our findings suggest that StUD is a useful performance-based test for individuals with KOA.

中文翻译：

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Step Up and Down (StUD) 测试对有症状膝关节骨关节炎患者的可靠性、有效性和响应性

背景

爬楼梯测试 (SCT) 已被建议作为有症状膝关节骨性关节炎 (KOA) 患者的首要任务。然而，执行 9 到 12 步 SCT 存在环境障碍。因此，我们开发了一种可行的一步 SCT，可以在 15 秒内完成。

客观的

检查 15 秒升降压 (StUD) 测试在 KOA 患者中的临床特性。

设计

前瞻性有效性研究。

方法

八十二名患有 KOA 的人参加了这项研究。StUD 测试的重测信度以 1 周为间隔进行测量。通过测试预定义的假设来评估结构有效性和反应性。为此，使用 30 秒椅子站立测试 (30CS)、定时起立测试 (TUG)、股四头肌力量、膝关节损伤和骨关节炎结果评分 (KOOS) 以及 Lequesne 算法功能指数作为比较工具。

结果

StUD 测试表现出良好的重测信度（ICC = 0.87；95% CI = 0.79–0.91），并显示与 30CS (r = 0.65)、TUG (r = -0.56) 和股四头肌力量 ( r = 0.41）。我们发现 StUD 测试和基于性能的测试之间的相关性高于患者报告的结果测量。StUD 测试是有反应的，六个假设中有五个 (83.3%) 得到证实。

结论

StUD 测试显示出良好的信度、足够的效度和反应性。我们的研究结果表明，StUD 是一种对 KOA 患者有用的基于性能的测试。