pzad121.pdf

In this study, we compared the accuracy of video-based gait analysis to ground-truth motion capture measurements during overground and treadmill walking in persons after stroke. We used video recordings constrained to 3 common clinical or in-home settings: frontal views of overground walking, sagittal views of overground walking, and sagittal views of treadmill walking. In a sample of persons after stroke, we found that video-based measurements of spatiotemporal gait parameters during treadmill walking were strongly correlated with ground-truth motion capture measurements (we previously observed similar results in overground walking21) and showed moderate to excellent reliability that video-based measurements of spatiotemporal gait parameters were generally more accurate from sagittal videos of overground and treadmill walking than from frontal videos of overground walking, that sagittal videos of overground walking resulted in more accurate measurements of lower extremity joint kinematics than sagittal videos of treadmill walking, and that video-based measurements of hip and knee kinematics were more accurate and reliable than measurements of ankle kinematics. These results demonstrate the ability to measure clinically relevant gait parameters accurately using only simple digital videos (recorded from multiple different perspectives and in different settings) and open-source software.