BACKGROUND The RGB-D camera is an alternative to asses kinematics in order to obtain objective measurements of functional limitations. The aim of this study is to analyze the validity, reliability, and responsiveness of the motion capture depth camera in sub-acute and chronic low back pain patients. METHODS Thirty subjects (18-65 years) with non-specific lumbar pain were screened 6 weeks following an episode. RGB-D camera measurements were compared with an inertial measurement unit. Functional tests included climbing stairs, bending, reaching sock, lie-to-sit, sit-to-stand, and timed up-and-go. Subjects performed the maximum number of repetitions during 30 s. Validity was analyzed using Spearman's correlation, reliability of repetitions was calculated by the intraclass correlation coefficient and the standard error of measurement, and receiver operating characteristic curves were calculated to assess the responsiveness. RESULTS The kinematic analysis obtained variable results according to the test. The time variable had good values in the validity and reliability of all tests (r = 0.93-1.00, (intraclass correlation coefficient (ICC) = 0.62-0.93). Regarding kinematics, the best results were obtained in bending test, sock test, and sit-to-stand test (r = 0.53-0.80, ICC = 0.64-0.83, area under the curve (AUC) = 0.55-84). CONCLUSION Functional tasks, such as bending, sit-to-stand, reaching, and putting on sock, assessed with the RGB-D camera, revealed acceptable validity, reliability, and responsiveness in the assessment of patients with low back pain (LBP). TRIAL REGISTRATION ClinicalTrials.gov NCT03293095 "Functional Task Kinematic in Musculoskeletal Pathology" September 26, 2017.

中文翻译：

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运动学评估的验证，可靠性和响应性结果，使用RGB-D相机分析亚急性和慢性下腰痛的运动。

背景技术RGB-D摄像机是驴运动学的一种替代选择，以便获得功能限制的客观测量结果。这项研究的目的是分析运动捕捉深度相机在亚急性和慢性下腰痛患者中的有效性，可靠性和响应性。方法发作后6周对30例非特异性腰痛患者（18-65岁）进行了筛查。RGB-D摄像机的测量值与惯性测量单元进行了比较。功能测试包括爬楼梯，弯曲，伸向袜子，躺着，坐着站着和定时走。受试者在30 s内执行了最大重复次数。使用Spearman相关性分析有效性，通过类内相关系数和测量标准误差计算重复性，计算接收器工作特性曲线以评估响应度。结果运动学分析根据试验获得了可变的结果。时间变量在所有测试的有效性和可靠性方面均具有良好的价值（r = 0.93-1.00，（类内相关系数（ICC）= 0.62-0.93）。在运动学方面，在弯曲测试，袜子测试和运动测试中获得了最佳结果。坐姿测试（r = 0.53-0.80，ICC = 0.64-0.83，曲线下面积（AUC）= 0.55-84）结论功能任务，例如弯曲，坐姿，伸手和推杆使用RGB-D相机进行的袜子评估，显示了在评估腰背痛（LBP）的患者中可接受的有效性，可靠性和响应性。试验注册ClinicalTrials.gov NCT03293095“肌肉骨骼病理学中的功能性运动学”