Orthoses are externally applied devices used to modify the structural and functional characteristics of the neuromusculoskeletal systems; prostheses are externally applied devices used to replace, wholly or in part, an absent or deficient body segment. Included are, e.g. body-powered and externally powered external orthoses, prostheses, orthopaedic footwear. Excluded are endo-prostheses, which are not part of this document.

A collection of compatible components that can be integrated to produce a range of different upper limb prostheses. Included are, e.g. cosmetic upper limb prostheses.

Functional components of upper limb prostheses that substitute for some of the dynamic and sensory attributes of the normal limb; prosthetic hands are designed to substitute for some of the functions of the normal hand and can be static, passive, active or combined passive/active; the prosthetic hands can be externally powered or body powered