Tsushima Hitoshi, Morris Meg E, McGinley Jennifer
Department of Physical Therapy, School of Health Sciences, Hirosaki University, 66-1 Honcho, Hirosaki, Aomori 036-8564, Japan.
School of Physiotherapy and Musculoskeletal Research Unit, La Trobe University, Victoria 3086, Australia.
J Jpn Phys Ther Assoc. 2003;6(1):9-17. doi: 10.1298/jjpta.6.9.
This study aimed to determine the test-retest reliability and inter-tester reliability of kinematic measures in a three-dimensional gait analysis system. Using a VICON 140™ three-dimensional motion analysis system, kinematic data for lower extremities during walking were collected by 2 testers (senior physical therapists) for 6 unimpaired adults (age = 20 to 52; mean = 35.2 ± 6.2). The study was conducted using a repeated measures design consisting of two testing sessions per day on two separate testing days. The reliability of joint angle data collected by two different testers on two different days was compared for 2 sessions (days) × 2 testers × 5 trials. Skin markers were placed on 15 defined pelvis and lower body locations in accordance with the VICON Clinical Manager model. Prior to the study commencing, the two physical therapists practiced marker placement for a 3 month period. The first measurements (T1) were carried out by two testers on the same day. The second measurement session (T2) was performed within two weeks using an identical procedure. Coefficients of multiple correlation (CMC) were calculated to evaluate the consistency between the kinematic variables across testers and sessions. Both test-retest and inter-tester reliability were high for motion in the sagittal plane (R a= 0.971 to 0.994), the frontal plane (R a= 0.759 to 0.977), and the transverse plane (R a= 0.729 to 0.899), excluding pelvic tilt. Reduction of variability of marker placement appears possible with standardization and understanding of the placement method. These findings provide evidence of the reliability of using three-dimensional motion analysis for measuring human gait.
本研究旨在确定三维步态分析系统中运动学测量的重测信度和测试者间信度。使用VICON 140™三维运动分析系统，由2名测试者（资深物理治疗师）对6名未受损成年人（年龄 = 20至52岁；平均 = 35.2±6.2岁）行走时的下肢运动学数据进行采集。该研究采用重复测量设计，在两个不同的测试日，每天进行两个测试时段。对两个不同测试者在两个不同日期收集的关节角度数据的信度进行了2个时段（天）×2名测试者×5次试验的比较。根据VICON Clinical Manager模型，在15个确定的骨盆和下半身位置放置皮肤标记。在研究开始前，两名物理治疗师进行了为期3个月的标记放置练习。第一次测量（T1）由两名测试者在同一天进行。第二次测量时段（T2）在两周内使用相同程序进行。计算多重相关系数（CMC）以评估不同测试者和时段间运动学变量的一致性。矢状面（R a = 0.971至0.994）、额状面（R a = 0.759至0.977）和横断面（R a = 0.729至0.899）（不包括骨盆倾斜）的运动的重测信度和测试者间信度均较高。通过标准化和对放置方法的理解，标记放置的变异性似乎有可能降低。这些发现为使用三维运动分析测量人类步态的可靠性提供了证据。
