Biomechanical Analysis of the Removable Shell Floor Reaction Orthosis and the Solid Ankle Foot Orthosis

S. OUNPUU, R. B. DAVIS,J. R. GAGE, AND D. TYBURSKI


Differences between a rigid ankle-foot orthosis and a removable shell floor reaction orthosis were investigated, with respect to their individual contribution to the ground reaction forces and lower-limb joint moments (torques). We examined how the orthoses differ in their contribution to ankle stability and control of sagittal plane motion.

Children were tested walking barefoot, with the rigid ankle-foot orthosis, and with the removable shell orthosis, using a standard clinical gait analysis test (Gage, et al 1984). Gait kinematics and force plate data were collected and joint moments for the ankle, knee, and hip were calculated. Multiple walks were performed for each condition to insure consistency of data.

Gage JR, Fabian D, Hicks R, Tashman S: Pre- and Postoperative Gait Analysis in Patients with Spastic Diplegia: A Preliminary Report. Journal of Pediatric Orthopaedics 4:715-725, 1984.

Newington Children's Hospital, 181 East Cedar Street, Newington, CT 06111