AUT University, Health & Rehabilitation Research Institute, Auckland, New Zealand.
J Foot Ankle Res. 2012 Aug 13;5:21. doi: 10.1186/1757-1146-5-21.
Postural stability can be measured in clinical and research settings using portable plantar pressure systems. People with rheumatoid arthritis (RA) have decreased postural stability compared to non-RA populations and impaired postural stability is associated with falls in people with RA. The purpose of this study was therefore to investigate the reliability of the TekScan MatScan® system in assessing postural stability in people with RA.
Twenty three participants with RA, mean (SD) age 69.74 (10.1) years, were assessed in barefoot double-limb quiet standing, with eyes open and eyes closed, for antero-posterior and medio-lateral postural sway values. Three repetitions, at a sampling frequency of 40 Hz, were recorded for each test condition to obtain a mean value. Measurements were repeated one hour later. Intraclass correlation coefficients (ICC) with 95% confidence intervals (CI) were calculated to determine between-session reliability. Measurement error was assessed through the calculation of the standard error of the measurement (SEM) and the smallest real difference (SRD).
The system displayed good to excellent reliability for antero-posterior and medio-lateral sway, with eyes open and closed, as indicated by ICC values ranging from 0.84 to 0.92. Measurement error, as evidenced by the SEM, ranged from 1.27 to 2.35 mm. The degree of change required to exceed the expected trial to trial variability was relatively high, compared to mean values, with SRD ranging from 3.08 to 5.71 mm.
The portability and ease of use of the TekScan MatScan® makes it a useful tool for the measurement of postural stability in clinical and research settings. The TekScan MatScan® system can reliably measure double-limb quiet standing in older people, aged 60 to 80 years, with RA.
姿势稳定性可以使用便携式足底压力系统在临床和研究环境中进行测量。与非类风湿关节炎（RA）人群相比，患有 RA 的人姿势稳定性降低，并且姿势稳定性受损与 RA 患者的跌倒有关。因此，本研究的目的是调查 TekScan MatScan®系统评估 RA 患者姿势稳定性的可靠性。
23 名 RA 患者（平均年龄 69.74±10.1 岁）进行赤脚双肢静立位、睁眼和闭眼状态下的前后和左右方向的姿势摆动值评估。每个测试条件记录 3 次重复，采样频率为 40Hz，以获得平均值。1 小时后重复测量。使用 95%置信区间（CI）的组内相关系数（ICC）来确定组间可靠性。通过测量标准误差（SEM）和最小实际差异（SRD）来评估测量误差。
该系统在睁眼和闭眼状态下，前后和左右方向的摆动显示出良好到极好的可靠性，ICC 值范围为 0.84 至 0.92。SEM 表明测量误差范围为 1.27 至 2.35mm。与平均值相比，超出预期试验间变异性所需的变化程度相对较高，SRD 范围为 3.08 至 5.71mm。
TekScan MatScan®的便携性和易用性使其成为临床和研究环境中测量姿势稳定性的有用工具。TekScan MatScan®系统可可靠测量年龄在 60 至 80 岁之间的 RA 老年人的双肢静立位。
