Inertial Measures of Motion for Clinical Biomechanics: Comparative Assessment of Accuracy under Controlled Conditions – Changes in Accuracy over Time

摘要: Background Interest in 3D inertial motion tracking devices (AHRS) has been growing rapidly among the biomechanical community. Although convenience of such seems to open a whole new world possibilities for evaluation clinical biomechanics, its limitations haven’t extensively documented. The objectives this study are: 1) assess change absolute and relative accuracy multiple units 3 commercially available AHRS over time; 2) identify different sources errors affecting document how they may affect measurements time. Methods This used an instrumented Gimbal table on which modules were carefully attached put through series velocity-controlled sustained motions including 2 minutes trials (2MT) 12 dynamic phases (12MDP). Absolute was assessed by comparison orientation those optical gold standard. Relative evaluated using variation between during trials. Findings Both decreased time 2MT. 12MDP showed significant decrease phases, but could be enhanced significantly resetting reference point and/or compensating initial Inertial frame estimation each phase. Interpretation The observed systems with can attributed part error, also foremost, ability locate same frame. Conclusions Mean accuracies obtained under conditions suggest that are promising tools mobility assessment constrained use. However, improvement magnetic compensation alignment desirable order reach their full potential capturing outcomes.