This International Standard establishes a vocabulary, in English and French, of terms used in the field of external limb prosthetics and external orthotics. This part of ISO 8549 defines terms relating to external orthoses that encompass joints. It does not include terms for orthoses which only encompass limb segments as these orthoses are limited mainly to use in the treatment of fractures and in sports medicine. (These terms may be considered for inclusion at a future revision.) NOTES 1 For the purposes of this International Standard, the abbreviatedterm 'prosthetics' and its derivatives only apply to external limb prosthetics;the abbreviated term 'orthotics' and its derivatives only applyto external orthotics. 2 Terms printed in italics are defined in ISO 8549-1. Alphabeticalindexes of terms in English and French are provided. 3 Users of this International Standard are also advised of the WHOInternational Classification of Impairments, Disabilities and Handicaps,published by the World Health Organization, Geneva, 1980.