Double-Flexure Designs for Orthotic Ankle Joints
J. MARTIN CARLSON, CPO, AND BRUCE DAY**Saint Paul, Minnesota
The Orthotic and Prosthetic Laboratory at Gillette Children's Hospital has developed two designs for double-flexure orthotic ankle joints. The double-flexure design approach retains the weight and cosmetic advantages of plastic while providing three advantages over the posterior leaf design: the flexures can be located for congruency between anatomic and orthotic joint axes, the desired ankle range of motion is almost totally free of resistance and the degree of motion restraint can be easily and precisely controlled. During the past few years we have provided several hundred orthoses with primary application in the areas of cerebral palsy and postoperative orthotic treatment of resistant clubfoot deformities. At the present time more than 25 percent of the ankle-foot orthoses made at Gillette Children's Hospital include a double-flexure ankle joint.
**Gillette Children's Hospital, 200 East University, Saint Paul; MN 55101