Video-based Sit-to-stand Evaluation for Stroke Patients

The purpose of this study is to develop and validate a novel video-based postural evaluation tool designed to objectively measure the quality and dynamics of the Sit-to-Stand (STS) motion in stroke patients, specifically allowing physical therapists to monitor patient progress remotely via tele-evaluation. Since stroke survivors often face difficulties attending regular in-clinic assessments, this tool addresses a critical unmet need. The core question this study aims to answer is whether this new video-based measurement can accurately and consistently assess standing ability when compared against established standards. To confirm the tool's trustworthiness, we will first test its reliability by assessing if different experts achieve the same results (Inter-rater reliability) and if the same expert achieves the same results across multiple trials (Intra-rater reliability). We will then confirm the tool's accuracy (validity) by examining if its derived scores correlate strongly with established clinical measures (e.g., Trunk Impairment Scale, TIS) and patient-reported outcome measures. Finally, we will verify its scientific precision by comparing the tool's detailed kinematic measurements (including total STS time and joint angles) against the gold-standard data derived from the Kinovea motion analysis software.