Motion pattern analysis for evaluation and design of a prosthetic hook.

This study was designed to evaluate motion patterns of individuals with upper extremity amputations while performing a manual task. The objectives were to analyze performance time of repeatable motion elements that constituted the locomotion of upper extremity amputees, and to develop the performance profile which could be used as an evaluation method of hand prostheses. The findings identified a significant difference in performance ability for motion element grasp, as compared to motion elements reach, move, position, and release. Performance profile of amputee patients was introduced. The profile displayed the contribution of the various motion elements to the overall performance time. The performance profile was used to evaluate the standard prosthetic hook, and served as a criterion for the design of a new functional hook.