McCahill Jennifer, Stebbins Julie, Koning Bart, Harlaar Jaap, Theologis Tim
Oxford Gait Laboratory, Nuffield Orthopaedic Centre, Oxford, UK; MOVE Research Institute, VU University, Amsterdam, Netherlands.
Oxford Gait Laboratory, Nuffield Orthopaedic Centre, Oxford, UK.
Gait Posture. 2018 Mar;61:86-89. doi: 10.1016/j.gaitpost.2017.12.023. Epub 2017 Dec 26.
The Oxford Foot Model (OFM) is a multi-segment, kinematic model developed to assess foot motion. It has previously been assessed for repeatability in healthy populations. To determine the OFM's reliability for detecting foot deformity, it is important to know repeatability in pathological conditions. The aim of the study was to assess the repeatability of the OFM in children with foot deformity.
Intra-tester repeatability was assessed for 45 children (15 typically developing, 15 hemiplegic, 15 clubfoot). Inter-tester repeatability was assessed in the clubfoot population. The mean absolute differences between testers (clubfoot) and sessions (clubfoot and hemiplegic) were calculated for each of 15 clinically relevant, kinematic variables and compared to typically developing children.
Children with clubfoot showed a mean difference between visits of 2.9° and a mean difference between raters of 3.6° Mean absolute differences were within one degree for the intra and inter-rater reliability in 12/15 variables. Hindfoot rotation, forefoot/tibia abduction and forefoot supination were the most variable between testers. Overall the clubfoot data were less variable than the typically developing population. Children with hemiplegia demonstrated slightly higher differences between sessions (mean 4.1°), with the most reliable data in the sagittal plane, and largest differences in the transverse plane.
The OFM was designed to measure different types of foot deformity. The results of this study show that it provides repeatable results in children with foot deformity. To be distinguished from measurement artifact, changes in foot kinematics as a result of intervention or natural progression over time must be greater than the repeatability reported here.
牛津足部模型（OFM）是一种多节段运动学模型，用于评估足部运动。此前已对其在健康人群中的重复性进行了评估。为了确定OFM检测足部畸形的可靠性，了解其在病理状况下的重复性很重要。本研究的目的是评估OFM在足部畸形儿童中的重复性。
对45名儿童（15名发育正常儿童、15名偏瘫儿童、15名马蹄内翻足儿童）进行了测试者内重复性评估。对马蹄内翻足人群进行了测试者间重复性评估。针对15个临床相关运动学变量中的每一个，计算了测试者（马蹄内翻足）和测试时段（马蹄内翻足和偏瘫儿童）之间的平均绝对差异，并与发育正常儿童进行了比较。
马蹄内翻足儿童两次就诊间的平均差异为2.9°，测试者间的平均差异为3.6°。12/15个变量的测试者内和测试者间可靠性的平均绝对差异在1度以内。后足旋转、前足/胫骨外展和前足旋后在测试者之间变化最大。总体而言，马蹄内翻足的数据变异性低于发育正常人群。偏瘫儿童各测试时段间的差异略高（平均4.1°），矢状面数据最可靠，横断面差异最大。
OFM旨在测量不同类型足部畸形。本研究结果表明，它在足部畸形儿童中提供了可重复的结果。为了与测量假象区分开来，因干预或随时间自然进展导致的足部运动学变化必须大于此处报告的重复性。
