Quantification of reaching during stroke rehabilitation using unique upper extremity kinematic model.

Quantification of rehabilitation progress is necessary for accurately assessing clinical treatments. A three-dimensional (3D) biomechanical model of the upper extremity was developed for quantification of stroke rehabilitation. The model was designed to accurately track the 3D orientation of the trunk, shoulder, elbow and wrist. This study explains the application of the upper extremity model. Strict validation of the model confirmed the system's accuracy and resolution. The model was applied to eight hemiparetic stroke patients with spasticity, while completing a set of reaching tasks. The model successfully detected statistical differences in elbow range of motion and angular velocity between the nonparetic (unaffected) and paretic (affected) arms. Both simple and complex biomechanical indices for assessment were developed. This model may aid in the assessment and planning of stroke rehabilitation, and help to decrease recovery time.