Carson M C, Harrington M E, Thompson N, O'Connor J J, Theologis T N
Oxford Orthopaedic Engineering Centre, University of Oxford, Oxford, UK.
J Biomech. 2001 Oct;34(10):1299-307. doi: 10.1016/s0021-9290(01)00101-4.
An unbiased understanding of foot kinematics has been difficult to achieve due to the complexity of foot structure and motion. We have developed a protocol for evaluation of foot kinematics during barefoot walking based on a multi-segment foot model. Stereophotogrammetry was used to measure retroreflective markers on three segments of the foot plus the tibia. Repeatability was evaluated between-trial, between-day and between-tester using two subjects and two testers. Subtle patterns and ranges of motion between segments of the foot were consistently detected. We found that repeatability between different days or different testers is primarily subject to variability of marker placement more than inter-tester variability or skin movement. Differences between inter-segment angle curves primarily represent a shift in the absolute value of joint angles from one set of trials to another. In the hallux, variability was greater than desired due to vibration of the marker array used. The method permits objective foot measurement in gait analysis using skin-mounted markers. Quantitative and objective characterisation of the kinematics of the foot during activity is an important area of clinical and research evaluation. With this work we hope to have provided a firm basis for a common protocol for in vivo foot study.
由于足部结构和运动的复杂性，很难对足部运动学有一个客观的认识。我们基于多节段足部模型开发了一种用于评估赤脚行走时足部运动学的方案。使用立体摄影测量法来测量足部三个节段以及胫骨上的反光标记。使用两名受试者和两名测试者对试验间、日间和测试者间的重复性进行了评估。始终能检测到足部各节段之间细微的运动模式和运动范围。我们发现，不同日期或不同测试者之间的重复性主要取决于标记放置的可变性，而不是测试者间的可变性或皮肤运动。节段间角度曲线的差异主要表现为关节角度绝对值从一组试验到另一组试验的偏移。在拇趾处，由于所使用的标记阵列的振动，变异性大于预期。该方法允许在步态分析中使用皮肤表面标记进行客观的足部测量。对活动期间足部运动学进行定量和客观的表征是临床和研究评估的一个重要领域。通过这项工作，我们希望为体内足部研究的通用方案提供坚实的基础。
