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Design, construction and evaluation of an electromechanical stance-control knee-ankle-foot orthosis
Terris Yakimovich1, Jonathan Kofman, Edward Lemaire
1Department of Mechanical Engineering, University of Ottawa, Ottawa, ON, K1N 6N5, Canada, phone: 613-247-0110; fax: 613-737-4260; (e-mail: terrisy@gmail.com).
Abstract:
A new electromechanical Stance-Control Knee-Ankle-Foot Orthosis (SCKAFO) was designed to provide improved gait for people with knee-extensor weakness. This SCKAFO inhibits knee flexion at any knee angle while allowing knee extension during weight bearing. During swing or other non-weight bearing activities, the SCKAFO allows free knee motion. A prototype joint was mechanically tested to determine the moment at failure, loading behaviour, and device safety. Quantitative kinematic gait analysis of three able-bodied subjects and three knee-anklefoot-orthosis (AFO) users showed that the new SCKAFO had a desired minimal effect on able-bodied walking gait. The SCKAFO permitted a mean increase in sagittal knee motion (488%) during swing for the three KAFO users and a reduction in pelvic obliquity and hip abduction angle abnormalities during terminal stance and swing for two KAFO users.
