Bolt Doris, Giger René, Wirth Stefan, Swanenburg Jaap
J Sport Rehabil. 2018 Jan 1;27(1). doi: 10.1123/jsr.2017-0074. Epub 2018 Jan 23.
The underlying mechanism in 27% of ankle sprains is a fall while navigating stairs. Therefore, the step-down test (SDT) may be useful to investigate dynamic postural stability deficits in individuals with chronic ankle instability (CAI).
To investigate the test-retest reliability and validity of the forward and lateral SDT protocol between individuals with CAI and uninjured controls.
Test-retest study.
University hospital.
A total of 46 individuals, 23 with CAI and 23 uninjured controls.
Time to stabilization of the forward and lateral SDT.
The absolute reliability (SEM = 0.04-0.12 s; SDD = 0.11-0.33 s) of the SDT protocol was acceptable, whereas the relative reliability (ICC, k = 0.12-0.63) and discriminant validity (P = .42-.99; AUC = 0.50-0.57) were not.
The SDT appears to not be challenging enough to detect dynamic postural stability differences between individuals with and without CAI. However, the SDT may be capable of measuring change over time based on its good absolute reliability.
27%的踝关节扭伤的潜在机制是在下楼梯时摔倒。因此，下台阶试验（SDT）可能有助于研究慢性踝关节不稳（CAI）个体的动态姿势稳定性缺陷。
研究CAI个体与未受伤对照组之间前向和侧向SDT方案的重测信度和效度。
重测研究。
大学医院。
共46名个体，23名CAI个体和23名未受伤的对照组。
前向和侧向SDT的稳定时间。
SDT方案的绝对信度（SEM = 0.04 - 0.12秒；SDD = 0.11 - 0.33秒）是可接受的，而相对信度（ICC，k = 0.12 - 0.63）和区分效度（P = 0.42 - 0.99；AUC = 0.50 - 0.57）则不然。
SDT似乎不足以挑战检测有或没有CAI的个体之间的动态姿势稳定性差异。然而，基于其良好的绝对信度，SDT可能能够测量随时间的变化。
