Use of the Modified Swedish Knee Cage in Preventing Hyperextension of the Knee in Children


The Swedish Knee Cage was designed in 1966 to control knee hyperextension while allowing knee flexion during walking. The cage was modified because commercial devices were too large and expensive. The modified version costs $40, as compared to a minimum of $200 charged by most orthotic departments. The cage can be made for infants as young as 10 months. Fabrication requires less than one hour with low-temperature thermoplastic. The rigid portion is a one-piece design with vertical bars and a horizontal piece. A reinforced strap of webbing and Velafoam is placed at the knee axis. Straps are also attached at the top and bottom borders of the cage. It has been used successfully since 1986 for children with arthrogryposis, mild cerebral palsy, and hypomyelinating neuropathy, aiding in ambulation and increasing quadriceps motor power.

*Department of Occupational Therapy, Alberta Children's Hospital, 1820 Richmond Road, SW, Calgary, Alberta T2T 5C7