Design, construction and evaluation of an electromechanical stance-control knee-ankle-foot orthosis

Terris Yakimovich; Jonathan Kofman; Edward Lemaire

doi:10.1109/IEMBS.2005.1616934

Design, construction and evaluation of an electromechanical stance-control knee-ankle-foot orthosis

Conf Proc IEEE Eng Med Biol Soc. 2005:2005:2333-40. doi: 10.1109/IEMBS.2005.1616934.

Authors

Terris Yakimovich¹, Jonathan Kofman, Edward Lemaire

Affiliation

¹ Department of Mechanical Engineering, University of Ottawa, Ottawa, ON, K1N 6N5, Canada, phone: 613-247-0110; fax: 613-737-4260; (e-mail: terrisy@gmail.com).

PMID: 17282703
DOI: 10.1109/IEMBS.2005.1616934

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-ankle-foot-orthosis (KAFO) 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.