Reliability and validity of pose estimation algorithm for measurement of knee range of motion after total knee arthroplasty

Bone & Joint Research

article

Yoshitomo Saiki¹  Tamon Kabata¹  Tomohiro Ojima²  Yoshitomo Kajino¹  Naoyuki Kubo³  Hiroyuki Tsuchiya¹ 

[1] Department of Orthopaedic Surgery, Graduate School of Medical Sciences, Kanazawa University;Department of Orthopaedic Surgery, Fukui General Hospital;Department of Rehabilitation Physical Therapy, Fukui General Hospital

关键词: Pose estimation;    Reliability;    Validity;    Knee range of motion;    Total knee arthroplasty;    total knee arthroplasty (TKA);    radiography;    intraclass correlation coefficients (ICCs);    flexion;    knee osteoarthritis;    linear regression analysis;    primary TKAs;    knee angles;    knees;   

DOI  :  10.1302/2046-3758.125.BJR-2022-0257.R1

学科分类：骨科学

来源: British Editorial Society Of Bone And Joint Surgery

【 摘 要 】

AimsWe aimed to assess the reliability and validity of OpenPose, a posture estimation algorithm, for measurement of knee range of motion after total knee arthroplasty (TKA), in comparison to radiography and goniometry.MethodsIn this prospective observational study, we analyzed 35 primary TKAs (24 patients) for knee osteoarthritis. We measured the knee angles in flexion and extension using OpenPose, radiography, and goniometry. We assessed the test-retest reliability of each method using intraclass correlation coefficient (1,1). We evaluated the ability to estimate other measurement values from the OpenPose value using linear regression analysis. We used intraclass correlation coefficients (2,1) and Bland–Altman analyses to evaluate the agreement and error between radiography and the other measurements.ResultsOpenPose had excellent test-retest reliability (intraclass correlation coefficient (1,1) = 1.000). The R2 of all regression models indicated large correlations (0.747 to 0.927). In the flexion position, the intraclass correlation coefficients (2,1) of OpenPose indicated excellent agreement (0.953) with radiography. In the extension position, the intraclass correlation coefficients (2,1) indicated good agreement of OpenPose and radiography (0.815) and moderate agreement of goniometry with radiography (0.593). OpenPose had no systematic error in the flexion position, and a 2.3° fixed error in the extension position, compared to radiography.ConclusionOpenPose is a reliable and valid tool for measuring flexion and extension positions after TKA. It has better accuracy than goniometry, especially in the extension position. Accurate measurement values can be obtained with low error, high reproducibility, and no contact, independent of the examiner’s skills.

【 授权许可】

CC BY-NC