Apiwan PusaraSumet HeamawatanachaiKomsak SinsurinChaiyong JorrakateNaresuan UniversityMahidol University2020-01-272020-01-272019-01-01International Biomechanics. Vol.6, No.1 (2019), 85-92233354322-s2.0-85073204893https://repository.li.mahidol.ac.th/handle/20.500.14594/50685© 2019, © 2019 The Author(s). Published by Informa UK Limited, trading as Taylor & Francis Group. The purposes of this study were to develop and evaluate the test-retest reliability of a specific low-cost three-dimensional webcam recording system (3D-WCRS) and compare its reliability to a standard motion analysis system. Twenty healthy volunteers comprised of 5 males and 15 females with a mean age of 22.90 years and mean BMI of 22.72 kg/m2 were investigated for angles of hip, knee and ankle joints in three planes while walking at a self-selected speed. Intraclass correlation coefficients (ICCs) were used to evaluate as well as compare the test-retest reliability of the 3D-WCRS and standard motion analysis system. Standard error of measurement (SEM) was also analyzed for the purposes of the study. The results exhibited excellent test-retest reliability for the 3D-WCRS (ICCs ranged between 0.93 and 0.99, p = 0.001) in the three joints and planes. The standard motion analysis system demonstrated excellent reliability for all joints and planes (ICCs ranged between 0.99 and 1.00, p = 0.001). Minimal SEM values were observed in both the 3D-WCRS and standard motion analysis systems. Therefore, the developed low-cost 3D-WCRS exhibits good to excellent test-retest reliability. The test-retest reliability of the 3D-WCRS is likely to be comparable to a standard motion analysis system.Mahidol UniversityComputer ScienceEngineeringHealth ProfessionsMedicineArticleSCOPUS10.1080/23335432.2019.1671221