Clinical utility of markerless motion capture for kinematic evaluation of sit-to-stand during 30 s-CST at one year post total knee arthroplasty: a retrospective study

• Published in: BMC musculoskeletal disorders Vol. 24; no. 1; p. 254
• Main Authors: Onitsuka, Katsuya, Kubota, Keisuke, Yokoyama, Moeka, Miyazawa, Taku, Hamaguchi, Toyohiro, Taniguchi, Hiroto, Usuki, Naohiro, Miyamoto, Satoshi, Okazaki, Ken, Murata, Kenji, Kanemura, Naohiko
• Format: Journal Article
• Language: English
• Published: England BioMed Central Ltd 01.04.2023; BioMed Central; BMC
• Subjects: Analysis; Arthritis; Arthroplasty (knee); Arthroplasty, Replacement, Knee; Biomechanical Phenomena; Care and treatment; Chair stand test; Clinical outcomes; Diagnosis; Exercise tests; Female; Forgotten joint; Humans; Joint replacement surgery; Kinematics; Knee; Knee Joint - surgery; Markerless motion capture; Methods; Motion Capture; Muscle strength; Musculoskeletal diseases; Osteoarthritis; Osteoarthritis, Knee - surgery; Patients; Physical therapy; Range of Motion, Articular; Retrospective Studies; Sit-to-stand; Total knee arthroplasty; Japan; Chair stand test; Total knee arthroplasty; Forgotten joint; Sit-to-stand; Kinematics; Markerless motion capture
• ISSN: 1471-2474; 1471-2474
• DOI: 10.1186/s12891-023-06364-3

Although the importance of kinematic evaluation of the sit-to-stand (STS) test of total knee arthroplasty (TKA) patients is clear, there have been no reports analyzing STS during the 30-s chair sit-up test (30 s-CST) with a focus on kinematic characteristics. This study aimed to demonstrate the clinical utility of kinematic analysis of STS during the 30 s-CST by classifying STS into subgroups based on kinematic parameters, and to determine whether differences in movement strategies are expressed as differences in clinical outcomes. The subjects were all patients who underwent unilateral TKA due to osteoarthritis of the knee and were followed up for one year postoperatively. Forty-eight kinematic parameters were calculated using markerless motion capture by cutting STS in the 30 s-CST. The principal components of the kinematic parameters were extracted and grouped by kinematic characteristics based on the principal component scores. Clinical significance was examined by testing whether differences in patient-reported outcome measures (PROMs) were observed. Five principal components were extracted from the 48 kinematic parameters of STS and classified into three subgroups (SGs) according to their kinematic characteristics. It was suggested that SG2, using a kinematic strategy similar to the momentum transfer strategy shown in previous studies, performed better in PROMs and, in particular, may be associated with achieving a "forgotten joint", which is considered the ultimate goal after TKA. Clinical outcomes differed according to kinematic strategies used STS, suggesting that kinematic analysis of STS in 30 s-CST may be useful in clinical practice. This study was approved by the Medical Ethical Committee of the Tokyo Women's Medical University (approval number: 5628 on May 21, 2021).