IRGO reciprocating orthosis is intended for people with lower extremities paralysis caused by spina bifida or MMC. The resiprocating movement is created with a swinging joint in the hip. The action of the joint is light, because of the lack of friction from cables. The hip components are available in all sizes one cm apart and the lower extremity parts are individually manufactured using a negative cast. The use of a resiprocating orthoses prevents the contractuse of the hip and exercises the gluteus maximus, the lower abdominal muscles and the hip extenders.