The Salera HKAFO has a 3-dimensional hip joint that allows certain amount of rotation, abduction and extension. Abduction and flexion are restricted. The brace was originally designed by Dr. Adriano Ferrari, who works in co-operation with the orthoses manufacturer Centro Ortopedico Emiliano S.r.l in northern Italy. A girl named Salera was the first person to use the prototype of the HKAFO. The orthosis has two main functions. If the quadriceps muscles are strong enough the movement of the knee joints can be free. If adequate muscle strength is not available or the knees have a flexion contracture of over 15 degrees, the knee joints must be locked during walking.