Criterion and Construct Validity of Prosthesis-Integrated Measurement of Joint Moment Data in Persons With Transtibial Amputation
Criterion and Construct Validity of Prosthesis-Integrated Measurement of Joint Moment Data in Persons With Transtibial Amputation
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DOI：
10.1123/jab.2013-0309
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发表时间：
2014-06-01
影响因子：
1.4
通讯作者：
Hafner, Brian J.
中科院分区：
文献类型：
--
作者：
Fiedler, Goeran;Slavens, Brooke;Hafner, Brian J.
义肢集成传感器在没有步态分析设备的临床环境中很有吸引力，但需要准确了解患者的表现。从称重传感器获得的数据（推断关节力矩）可以帮助临床医生对肢体丧失者的处方、对齐和步态康复。本研究的目的是评估在临床实践中常规使用的假体集成称重传感器的准确性。采用市售假体集成称重传感器、10摄像头运动分析系统和压电测力板同时测量胫骨截肢患者的平地行走。得出踝关节和膝关节屈伸力矩，并通过相关分析比较测量方法。Pearson相关系数从踝关节旋前力矩的0.661到踝关节屈伸力矩的0.915 （P < 0.001）。测量方法之间的均方根误差在测量范围的10%左右，并且可以解释。结果的差异反映了系统之间在测量变量的定义和计算方面的差异。它们可能不会限制称重传感器的临床使用，但当数据直接与传统的步态分析数据进行比较时，应该考虑到这一点。研究结果支持了测力元件结构的有效性（即原位测量关节力矩的能力）。
Prosthesis-integrated sensors are appealing for use in clinical settings where gait analysis equipment is unavailable, but accurate knowledge of patients' performance is desired. Data obtained from load cells (inferring joint moments) may aid clinicians in the prescription, alignment, and gait rehabilitation of persons with limb loss. The purpose of this study was to assess the accuracy of prosthesis-integrated load cells for routine use in clinical practice. Level ground walking of persons with transtibial amputation was concurrently measured with a commercially available prosthesis-integrated load cell, a 10-camera motion analysis system, and piezoelectric force plates. Ankle and knee flexion/extension moments were derived and measurement methods were compared via correlation analysis. Pearson correlation coefficients ranged from 0.661 for ankle pronation/supination moments to 0.915 for ankle flexion/extension moments (P < .001). Root mean squared errors between measurement methods were in the magnitude of 10% of the measured range and were explainable. Differences in results depicted differences between systems in definition and computation of measurement variables. They may not limit clinical use of the load cell, but should be considered when data are compared directly to conventional gait analysis data. Construct validity of the load cell (ie, ability to measure joint moments in-situ) is supported by the study results.