Johnson Linda B, Sumner Sean, Duong Tina, Yan Posu, Bajcsy Ruzena, Abresch R Ted, de Bie Evan, Han Jay J
Department of Physical Medicine and Rehabilitation, University of California at Davis School of Medicine and Medical Center, 4860 Y Street, Suite 3850, Sacramento, CA 95817, USA.
Children's National Medical Center, 111 Michigan Avenue NW, DC 20011, USA.
Man Ther. 2015 Dec;20(6):777-82. doi: 10.1016/j.math.2015.03.004. Epub 2015 Mar 17.
Goniometers are commonly used by physical therapists to measure range-of-motion (ROM) in the musculoskeletal system. These measurements are used to assist in diagnosis and to help monitor treatment efficacy. With newly emerging technologies, smartphone-based applications are being explored for measuring joint angles and movement.
This pilot study investigates the intra- and inter-rater reliability as well as concurrent validity of a newly-developed smartphone magnetometer-based goniometer (MG) application for measuring passive shoulder abduction in both sitting and supine positions, and compare against the traditional universal goniometer (UG).
This is a comparative study with repeated measurement design.
Three physical therapists utilized both the smartphone MG and a traditional UG to measure various angles of passive shoulder abduction in a healthy subject, whose shoulder was positioned in eight different positions with pre-determined degree of abduction while seated or supine. Each therapist was blinded to the measured angles. Concordance correlation coefficients (CCCs), Bland-Altman plotting methods, and Analysis of Variance (ANOVA) were used for statistical analyses.
Both traditional UG and smartphone MG were reliable in repeated measures of standardized joint angle positions (average CCC > 0.997) with similar variability in both measurement tools (standard deviation (SD) ± 4°). Agreement between the UG and MG measurements was greater than 0.99 in all positions.
Our results show that the smartphone MG has equivalent reliability compared to the traditional UG when measuring passive shoulder abduction ROM. With concordant measures and comparable reliability to the UG, the newly developed MG application shows potential as a useful tool to assess joint angles.
物理治疗师通常使用角度测量仪来测量肌肉骨骼系统的活动范围（ROM）。这些测量结果用于辅助诊断并监测治疗效果。随着新技术的出现，人们正在探索基于智能手机的应用程序来测量关节角度和运动。
本初步研究调查了一种新开发的基于智能手机磁力计的角度测量仪（MG）应用程序在测量坐位和仰卧位被动肩关节外展时的评分者内和评分者间可靠性以及同时效度，并与传统通用角度测量仪（UG）进行比较。
这是一项采用重复测量设计的比较研究。
三名物理治疗师使用智能手机MG和传统UG测量一名健康受试者被动肩关节外展的不同角度，该受试者的肩部在坐位或仰卧位时处于八个预先确定外展角度的不同位置。每位治疗师对测量角度不知情。使用一致性相关系数（CCC）、布兰德-奥特曼绘图法和方差分析（ANOVA）进行统计分析。
传统UG和智能手机MG在标准化关节角度位置的重复测量中均可靠（平均CCC>0.997），两种测量工具的变异性相似（标准差（SD）±4°）。UG和MG测量值之间在所有位置的一致性均大于0.99。
我们的结果表明，在测量被动肩关节外展ROM时，智能手机MG与传统UG具有同等的可靠性。新开发的MG应用程序测量结果一致且与UG可靠性相当，显示出作为评估关节角度有用工具的潜力。
