An orthosis may be used to (a) control, guide, limit/immobilise an extremity, joint, or body segment for a particular reason; (b) restrict movement in a given direction; (c) assist movement generally; (d) reduce weight bearing forces for a particular purpose; (d) aid rehabilitation from fractured after the removal of a cast; and (e) otherwise correct the shape and/or function of the body, to provide easier movement capability or reduce pain.
A below knee (BK) prosthesis is a lower-extremity prosthesis that provides replacement at the following levels of amputation: transtibial, ankle disarticulation, and foot amputations.
An above knee (AK) prosthesis is a lower-extremity prosthesis that provides replacement at the following levels of amputation: transfemoral, knee disarticulation, and hip disarticulation.
UPPER LIMB PROSTHESES
An upper limb prosthesis belongs to one of the three categories: passive devices, body-powered devices, or externally-powered (myoelectric) devices.