Reliability and validity of static knee strength measurements obtained with a chair-fixed dynamometer in subjects with hip or knee arthroplasty
Reliability and validity of static knee strength measurements obtained with a chair-fixed dynamometer in subjects with hip or knee arthroplasty
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DOI：
10.1016/j.apmr.2005.04.013
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发表时间：
2005-10-01
影响因子：
4.3
通讯作者：
Hilsenrath, M
中科院分区：
文献类型：
--
作者：
Gagnon, D;Nadeau, S;Hilsenrath, M
目的：评价座椅固定式测力仪力量测量的可靠性(试验间、评估者间)和同时效度，并推荐一种将测量标准误差(SEM)最小化的临床方案。设计：在会议期间重复测量椅子固定式测力器和Cybex测力仪上膝关节屈曲和伸肌在屈曲30度和60度时的最大静态强度。地点：一家康复医院的门诊理疗科。参与者：50名接受全髋关节置换术(n=25)或膝关节置换术(n=25)的受试者的便利样本。干预：不适用。主要观察指标：可靠性用可靠性指数来量化，相应的SEM用概化理论估计，相关系数用来评估效度。结果：对于不同运动和位置的力量测量，可靠性指数证实良好的试验间(0.98~1.00)和很好的交互评价器(0.92~99)可靠性。平均3次试验最大限度地降低了小梁面积(所有测量均为2 NM)。将Cybex测力仪测得的力量值与座椅固定式测力器测得的力量值进行比较，结果表明，当受试者的膝关节位置为60度时，相关性最强，而接受全膝关节置换术的受试者(0.78-92度对87-93度)或髋关节置换者(33-85度对86-91度)的相关性最强。结论：在熟悉一段时间后，膝关节位置60度的受试者平均进行3次临床试验。对于膝关节屈肌和伸肌，建议由训练有素的治疗师进行，以最大限度地减少用固定在椅子上的测功机测量的力量值的测量误差。
Objectives: To evaluate the reliability (intertrial, interevaluator) and the concurrent validity of strength measurements obtained with a chair-fixed dynamometer and to recommend a clinical protocol that minimizes standard error of measurement (SEM).Design: Within-session repeated measures of maximal static strength of knee flexors and extensors at 30 degrees and 60 degrees of flexion on the chair-fixed and Cybex dynamometers. Setting: Ambulatory physiotherapy department of a rehabilitation hospital.Participants: Convenience sample of 50 subjects with total hip (n=25) or knee (n=25) arthroplasty.Interventions: Not applicable.Main Outcome Measures: Reliability was quantified by indices of dependability and corresponding SEMs estimated with the generalizability theory, whereas coefficients of correlation were used to assess the validity.Results: Indices of dependability confirmed excellent intertrial (0.98-1.00) and a very good interevaluator (.92-99) reliability for the strength measures obtained for different movements and positions. An average of 3 trials minimized the magnitude of the SEMs (> 2Nm for all measurements). When comparing the strength values obtained with the Cybex dynamometer to those measured with the chair-fixed dynamometer, strongest relations were attained when the tested knee was positioned at 60 degrees compared with 30 degrees for subjects with a total knee (.78-92 vs.87-93) or hip (33-85 vs.86-91) arthroplasty.Conclusions: A clinical protocol averaging 3 trials with the knee positioned at 60 degrees after a familiarization period. both for knee flexors and extensors, performed by a trained therapist is recommended to minimize measurement errors on strength values measured with the chair-fixed dynamometer.