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BS ISO 29783 — Prosthetics and Orthotics Gait Vocabulary Series
Prosthetics and orthotics — Vocabulary
BS ISO 29783-2:2015 · BS ISO 29783-3:2016
BS ISO 29783-2:2015 · BS ISO 29783-3:2016
🦿 BS ISO 29783 is an ISO series on Vocabulary for the prosthetics and orthotics field, published in the United Kingdom by BSI. The series focuses on gait-related professional terminology: Part 2 defines terms for prosthetic gait, while Part 3 defines terms for pathological gait (excluding prosthetic gait). It unifies the language used in prosthetics, orthotics and rehabilitation engineering to describe gait abnormalities, providing a common terminology basis for clinical assessment, prosthetic fitting and research communication. UK participation was coordinated by Technical Committee CH/168 (Prosthetics and orthotics).
💡 A unified gait terminology is the “common language” for clinical and engineering collaboration: physicians, prosthetists, rehabilitation therapists and researchers can accurately assess conditions, compare outcomes and conduct multi-centre studies only when they describe gait abnormalities with the same terms.
1. Background and Positioning of the Series 📌
Gait analysis is central to clinical work in prosthetics and orthotics. After an amputee is fitted with a prosthesis, their walking pattern (prosthetic gait) shows a range of characteristic deviations; various neurological, muscular and skeletal conditions also produce pathological gait. Historically, different institutions described these gait abnormalities very differently, and inconsistent terminology seriously hampered clinical communication and research data comparability. The ISO 29783 series was developed to unify these terms: Part 2 focuses on prosthetic gait, Part 3 on pathological gait (excluding prosthetic gait), and together they cover the main types of gait abnormality in rehabilitation.
The series belongs to the “vocabulary” category of ISO standards (ICS includes 01.040.11 medical technology vocabulary and 11.040.40 prosthetics and orthotics). Its core value is to provide standardised, consistent definitions rather than specific performance requirements or test methods.
2. Series Structure and Document List 📋
| Standard | Title | Content Focus |
|---|---|---|
| BS ISO 29783-2:2015 | Prosthetics and orthotics — Vocabulary — Part 2: Prosthetic gait | Terms for prosthetic gait abnormalities, described by amputation level and gait cycle phase |
| BS ISO 29783-3:2016 | Prosthetics and orthotics — Vocabulary — Part 3: Pathological gait (excluding prosthetic gait) | Terms for pathological gait, including methods of describing gait deviations and classification |
⚠️ The two parts cover different sources of gait: Part 2 addresses walking patterns of amputees fitted with prostheses, while Part 3 addresses pathological gait from non-prosthetic causes (stroke, orthopaedic deformity, neuromuscular disease). Together they comprehensively describe gait abnormalities in the rehabilitation population.
3. Part 2 — Prosthetic Gait Terminology 👣
BS ISO 29783-2:2015 first provides a general framework for describing prosthetic gait abnormalities, then systematically describes them by amputation level (e.g. trans-tibial, trans-femoral) and gait cycle phase (initial contact/loading response, mid-stance/terminal stance, pre-swing/swing). Key concepts covered include:
- Initial contact and loading response: foot-strike pattern on the prosthetic side, knee and ankle stability, and weight-transfer characteristics.
- Mid-stance and terminal stance: trunk lateral shift, pelvic tilt and prosthetic-side support function during single support.
- Pre-swing and swing: coordinated ankle-knee-hip flexion/extension and foot clearance after the prosthetic side leaves the ground.
- Gait cycle abnormalities: stride length asymmetry, reduced cadence, abnormal pelvic rotation and trunk compensation, among others.
By terming these phases, clinicians can precisely record “which phase, which abnormality, how compensated”, guiding prosthetic adjustment and rehabilitation training.
4. Part 3 — Pathological Gait Terminology 🧍
BS ISO 29783-3:2016 first defines its scope, clarifying that the objects of description are pathological gaits excluding prosthetic gait, then specifies the method of describing gait deviations, including classification and naming by abnormality type (e.g. foot drop, knee hyperextension, hip compensation, trunk lean). The standard’s unified definitions allow gait abnormalities from different causes to be identified and recorded in a consistent manner.
This part complements Part 2: Part 2 describes gait after prosthetic fitting, while Part 3 describes gait caused by disease or injury. Together they form a complete gait terminology system for prosthetics and orthotics, supporting the standardisation of gait analysis instruments, clinical assessment scales and rehabilitation programmes.
5. Clinical and Engineering Practice 🛠️
- 📋 Standardised clinical records: use BS ISO 29783 terminology for case notes and assessment records to ensure consistency across institutions and staff.
- 🦿 Prosthetic fitting and adjustment: based on the prosthetic gait abnormality classification in Part 2, adjust prosthesis alignment, ankle angle and knee damping accordingly.
- 🧪 Gait analysis: link standard terminology with three-dimensional gait analysis and kinematic/kinetic parameters to achieve a combined “quantitative + terminology” description.
- 🔬 Research and communication: use standard terminology uniformly in papers and reports to improve comparability and reproducibility of results.
🚨 Description of gait abnormalities directly affects rehabilitation planning and prosthetic prescription. Confused terminology can lead to misdiagnosis, mis-fitting and distorted outcome assessment; clinical and engineering staff should record and communicate strictly in accordance with standard terms.
6. Frequently Asked Questions ❓
Q1: Is BS ISO 29783 a performance requirement or a terminology standard?
It is a vocabulary standard. Its core is to provide standardised, consistent definitions; it does not specify concrete performance requirements or test methods for prostheses or orthoses.
It is a vocabulary standard. Its core is to provide standardised, consistent definitions; it does not specify concrete performance requirements or test methods for prostheses or orthoses.
Q2: How do the two parts differ?
Part 2 defines prosthetic gait terms (gait of an amputee fitted with a prosthesis); Part 3 defines pathological gait terms (non-prosthetic causes). They are complementary.
Part 2 defines prosthetic gait terms (gait of an amputee fitted with a prosthesis); Part 3 defines pathological gait terms (non-prosthetic causes). They are complementary.
Q3: Who should use the series?
Rehabilitation physicians, prosthetists and orthotists, physical therapists, rehabilitation engineers, and researchers working on gait analysis and rehabilitation.
Rehabilitation physicians, prosthetists and orthotists, physical therapists, rehabilitation engineers, and researchers working on gait analysis and rehabilitation.
Q4: How is the gait cycle divided?
The gait cycle is typically divided into stance and swing phases; stance includes initial contact, loading response, mid-stance, terminal stance and pre-swing, while swing includes early, mid and late swing.
The gait cycle is typically divided into stance and swing phases; stance includes initial contact, loading response, mid-stance, terminal stance and pre-swing, while swing includes early, mid and late swing.
Q5: Does it involve specific numerical requirements?
No. The series is a vocabulary standard focused on term definitions and classification; specific gait parameters (cadence, stride length) are covered separately by relevant measurement and assessment methods.
No. The series is a vocabulary standard focused on term definitions and classification; specific gait parameters (cadence, stride length) are covered separately by relevant measurement and assessment methods.