hip-knee-ankle-foot orthosis (HKAFO)
/ HKAFO = H-KAY-fo /
When a leg is unreliable not just at the knee but at the hip too — so the hip swings sideways or the trunk pitches forward with every step — bracing the leg alone is not enough. The hip-knee-ankle-foot orthosis, HKAFO, extends a KAFO upward with a hip joint and a band around the pelvis, so it controls the hip, knee, ankle, and foot together as one structure.
By adding control at the hip, an HKAFO stops the leg from rotating or swinging out of line and can help hold the trunk upright. A well-known version is the reciprocating gait orthosis (RGO), used by some people with paralysis from spinal cord injury or spina bifida: a cable or bar links the two hip joints so that as one leg pushes back, the other is driven forward, letting a person who cannot move the legs at all take reciprocal steps using the trunk and arms. It is, in effect, a walking machine the person drives with their upper body.
HKAFOs are at the demanding end of bracing. They are heavy, slow and tiring to walk in, and putting them on takes time and help. For many adults, especially with complete paralysis, the energy cost is so high that a wheelchair is faster and far less exhausting for everyday distance, and the brace is reserved for therapeutic standing and short distances. The honest reality is that the ability to stand and take steps is valued for health, circulation and dignity even when wheeled mobility remains the practical everyday choice.
A teenager with spina bifida uses a reciprocating gait orthosis with crutches. Leaning on the crutches and shifting his trunk, he drives the linked hip joints so the legs step in turn — standing tall in the therapy gym, even though he uses a wheelchair to get to school.
A KAFO extended to the pelvis to control the hip too — powerful, but heavy and energy-hungry to walk in.
For many adults with complete leg paralysis, the energy cost of HKAFO walking is so high that a wheelchair is the practical everyday choice; the brace is often kept for therapeutic standing rather than community walking.