'Outwalk': a protocol for clinical gait analysis based on inertial and magnetic sensors
'Outwalk': a protocol for clinical gait analysis based on inertial and magnetic sensors
复制标题
DOI：
10.1007/s11517-009-0545-x
复制
发表时间：
2010-01-01
影响因子：
3.2
通讯作者：
Ferrari, Adriano
中科院分区：
文献类型：
--
作者：
Cutti, Andrea Giovanni;Ferrari, Alberto;Ferrari, Adriano
开发了一种名为Outwalk的协议，通过惯性和磁性测量系统（IMMS）轻松测量脑瘫（CP）儿童和截肢者在自由生活条件下步态期间的胸骨盆和下肢3D运动学。Outwalk通过三个步骤定义每个身体部分的解剖/功能坐标系（CS）：（1）按照简单的规则将IMMS的传感单元（SU）定位在受试者的胸部、骨盆、大腿、小腿和脚上;（2）计算膝关节的平均屈曲-伸展轴的方向;（3）当受试者的身体以预定义的姿势（直立或仰卧）取向时，测量SU的取向。如果选择仰卧位，e。G.当痉挛状态不允许保持直立姿势时，必须通过标准测角器测量髋关节和膝关节的静态屈曲角度，并将其输入定义Outwalk解剖学CS的方程中。为了测试这些角度的评分者间测量的可靠性，进行了一项研究，涉及9名健康儿童（7.9 +/- 2岁）和两名物理治疗师作为评分者。结果显示，臀部和膝盖角度的RMS误差分别为1.4度和1.8度，最坏情况下的测量标准误差分别为2.0度和2.5度，可以忽略不计。因此，结果小于通过光电系统使用CAST方案进行相同测量时报告的结果，并支持Outwalk在CP儿童中开始临床试验。
A protocol named Outwalk was developed to easily measure the thorax-pelvis and lower-limb 3D kinematics on children with cerebral palsy (CP) and amputees during gait in free-living conditions, by means of an Inertial and Magnetic Measurement System (IMMS). Outwalk defines the anatomical/functional coordinate systems (CS) for each body segment through three steps: (1) positioning the sensing units (SUs) of the IMMS on the subjects' thorax, pelvis, thighs, shanks and feet, following simple rules; (2) computing the orientation of the mean flexion-extension axis of the knees; (3) measuring the SUs' orientation while the subject's body is oriented in a pre-defined posture, either upright or supine. If the supine posture is chosen, e. g. when spasticity does not allow to maintain the upright posture, hips and knees static flexion angles must be measured through a standard goniometer and input into the equations that define Outwalk anatomical CSs. In order to test for the inter-rater measurement reliability of these angles, a study was carried out involving nine healthy children (7.9 +/- 2 years old) and two physical therapists as raters. Results showed RMS error of 1.4 degrees and 1.8 degrees and a negligible worst-case standard error of measurement of 2.0 degrees and 2.5 degrees for hip and knee angles, respectively. Results were thus smaller than those reported for the same measures when performed through an optoelectronic system with the CAST protocol and support the beginning of clinical trials of Outwalk with children with CP.