ISO 8549-4:2026

Prosthetics and orthotics — Vocabulary — Part 4: Terms relating to limb amputation

This document defined terms for the description of surgical limb amputations and amputation procedures. NOTE Traumatic limb loss and congenital limb deficiency are not included in this document.

Prothèses et orthèses — Vocabulaire — Partie 4: Termes relatifs à l'amputation de membres

General Information

• Status: Published
• Publication Date: 19-May-2026
• ICS: 01.040.11 - Health care technology (Vocabularies)
• ICS: 11.040.40 - Implants for surgery, prosthetics and orthotics
• Technical Committee: ISO/TC 168 - Prosthetics and orthotics
• Drafting Committee: ISO/TC 168 - Prosthetics and orthotics
• Current Stage: 6060 - International Standard published
• Start Date: 20-May-2026
• Due Date: 02-May-2026
• Completion Date: 20-May-2026

Relations

• Revises: ISO 8549-4:2020 - Prosthetics and orthotics — Vocabulary — Part 4: Terms relating to limb amputation
• Effective Date: 06-May-2023

Overview

ISO 8549-4: Prosthetics and Orthotics – Vocabulary – Part 4: Terms Relating to Limb Amputation is an international standard developed by the International Organization for Standardization (ISO). This document provides a consistent vocabulary for describing surgical limb amputations, specific amputation procedures, and individuals who have undergone limb amputation.

Having a harmonized language is crucial for healthcare professionals, researchers, manufacturers, policymakers, and individuals with limb loss. ISO 8549-4 ensures effective communication and data comparison across the fields of prosthetics, orthotics, surgery, epidemiology, and rehabilitation.

Key Topics

• General Limb Amputation Terms

  • Definitions for surgical removal of all or part of a limb
  • Differentiation between upper and lower limb amputations
  • Clarification of terms such as residual limb (residuum/stump) and level of amputation

• Specific Amputation Levels

  • Upper limb:
    • Partial hand, wrist disarticulation, transradial, elbow disarticulation, transhumeral, shoulder disarticulation, scapulothoracic disarticulation
  • Lower limb:
    • Partial foot, ankle disarticulation, transtibial, knee disarticulation, transfemoral, hip disarticulation, transpelvic amputation

• Describing Amputation Procedures

  • Initial or primary amputation
  • Revision amputation
  • Two-stage amputation
  • Reamputation

• Classification by Number and Laterality

  • Unilateral, bilateral, contralateral, triple, and quadruple amputations

• Person-Centered Language

  • Aligns with updated terminology by replacing “amputee” with “a person who has had an amputation”

Applications

ISO 8549-4 is an integral standard for the following practical applications:

• Clinical Documentation and Communication:
  Enables surgeons, prosthetists, orthotists, and allied professionals to document and discuss amputation procedures with clarity and precision.

• Rehabilitation and Patient Assessment:
  Supports consistent assessment for rehabilitation teams planning prosthetic or orthotic interventions.

• Epidemiology and Research:
  Researchers and epidemiologists use the defined terms to ensure comparability of study results and statistics related to limb amputation worldwide.

• Device Manufacturing and Procurement:
  Manufacturers of prosthetic and orthotic devices refer to these terms to design and specify products suitable for various levels of limb loss.

• Policy Development and Reporting:
  Assists government and non-government agencies in drafting policies, preparing reports, and compiling national data on limb loss and prosthetic needs.

Related Standards

ISO 8549-4 is part of the wider ISO 8549 series, which addresses terminology in the field of prosthetics and orthotics. Other related standards include:

• ISO 8549-1: General terms for external limb prostheses and orthoses
• ISO 8549-2: Terms relating to external limb prostheses
• ISO 8549-3: Terms relating to external orthoses
• ISO 9999: Classification of assistive products for persons with disability

For a complete and up-to-date list of related standards, visit the ISO website.

Summary

By standardizing the language around limb amputation, ISO 8549-4:2026 enhances clarity, improves patient care, and streamlines communication among professionals and stakeholders globally. Adopting this vocabulary is essential for anyone engaged in the fields of prosthetics and orthotics, providing a foundation for consistent documentation, research, and innovation in medical and rehabilitation practice.

Standards Content (Sample)

International
Standard
ISO 8549-4
Third edition
Prosthetics and orthotics —
2026-05
Vocabulary —
Part 4:
Terms relating to limb amputation
Prothèses et orthèses — Vocabulaire —
Partie 4: Termes relatifs à l'amputation de membres
Reference number
© ISO 2026
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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or ISO’s member body in the country of the requester.
ISO copyright office
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Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
3.1 General limb amputation .1
3.2 Upper limb amputation levels .2
3.3 Lower limb amputation levels .3
3.4 Amputation procedures .4
Index . 5

iii
Foreword
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bodies (ISO member bodies). The work of preparing International Standards is normally carried out through
ISO technical committees. Each member body interested in a subject for which a technical committee
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The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
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Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 168, Prosthetics and orthotics.
This third edition cancels and replaces the second edition (ISO 8549-4:2020), which has been technically
revised.
The main changes are as follows:
— the use of hyphens in anatomical terms, such as transpelvic, has been abandoned in line with other parts
of the ISO 8549 series;
— the term “amputee” has been removed from the standard and replaced with “person who have had an
amputation”.
A list of all parts in the ISO 8549 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Introduction
This document provides an internationally accepted terminology which describes the full range of limb
amputation levels and procedures.
This is intended for the use of all practitioners dealing with persons who have had a limb amputation to
describe their clinical experiences and compare them with the experience of others.
It can also be of value to other stakeholders, including persons who have had an amputation, epidemiologists,
researchers, manufacturers, and government and non-government organisations.

v
International Standard ISO 8549-4:2026(en)
Prosthetics and orthotics — Vocabulary —
Part 4:
Terms relating to limb amputation
1 Scope
This document defined terms for the description of surgical limb amputations and amputation procedures.
NOTE Traumatic limb
...