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Activity Levels

What is an Activity Level?

There are many different activity scales used by different groups of professionals and different parts of the world.

Activity levels are a measure of what that person is capable of (in some markets, such as the United States, it is used when prescribing components of a higher level of activity as an indication of what that person has the possibility to achieve).

The prosthetist looks at an amputee's static and dynamic sitting and standing activities, as well as transfer and gait (pattern of walking) skills of progressing difficulty. Higher scores indicate better mobility.

Your physician determines your functional ability level. If your functional ability increases over time, your rating can be changed to a higher level.

How do you know what your activity level is?

K-Levels Illustration

Prescription Activity Level Guide

K1        Has the ability or potential to use a prosthesis for transfers or ambulation on level surfaces at fixed cadence. Typical of the limited and unlimited household ambulator

K2        Has the ability or potential for ambulation with the ability to traverse low-level environmental barriers such as curbs, stairs, or uneven surfaces. Typical of the limited community ambulator

K3        Has the ability or potential for ambulation with variable cadence. Typical of the community ambulator who has the ability to traverse most environmental barriers and may have vocational, therapeutic, or exercise activity that demands prosthetic utilisation beyond simple locomotion

K4        Has the ability or potential for prosthetic ambulation that exceeds the basic ambulation skills, exhibiting high impact, stress, or energy levels, typical of the prosthetic demands of the child, active adult, or athlete


Prescription Impact Level Guide

Low                  Daily walking and occasional sports such as golf and hiking
Moderate         Aggressive walking, frequent or daily sports such as jogging
High                  Daily activities such as distance running, climbing, lifting and carrying heavy objects for vocational purposes.



  1. The maximum user weight/activity guidelines are available on our catalogue product pages and Clinician’s Manuals and give the ideal functional prescription. This may vary by region or reimbursement system. Our instructions for use provide structural safety levels which may differ.
  2. The weight limit on the complete prosthesis is determined by its lowest rated component.
  3. The weight limit applies to all products unless stated otherwise.
  4. Before assembly always refer to the appropriate technical information.

Download a PDF Catalogue of Our Products

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Product Catalogue Front Page
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Introducing Linx

Fully integrated, microprocessor controlled lower limb system for above knee amputees.

Key Features

• Situational Awareness - Integrated sensors continuously collect data to seamlessly adapt the limb’s response.
• Varying levels of stance resistance to optimise safety at all times:
    - Standing support
    - Supported sitting
    - Controlled stance support
    - Stumble recovery
    - Dynamic stair descent
    - Dynamic slope descent
• Cycling Mode and Fixed Angle Flexion Lock Mode
• Knee Flexion to 130°
• Intuitive Programming Software via PC or App
• Up to 3 days battery life
• Sandal Toe Foot Shell

The Blatchford Community

For over 130 years Blatchford has designed and produced some of the world's most advanced artificial limbs and mobility solutions. Learn more about resources available to help you and/or the amputee in your life!

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