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PROPRIO FOOT is an adaptive prosthetic device for low to moderately active below-knee amputees that mimics natural foot motion. Motor-powered ankle motion increases ground clearance and reduces the risk of tripping and falling. This allows users to traverse different kinds of terrain in a natural and secure way.

Key features

  • Increases ground clearance, reduces the risk of trips and falls and enhances safety and gait quality.
  • Enables users to focus on their surroundings, instead of the walking terrain, offering a high degree of ground compliance, on all kinds of surfaces.
  • Reduces strain on knees, hips and back.
  • Enhances stability, efficiency and comfort on inclines, declines and stairs.
  • Maintains symmetry and alignment while changing shoes.


Impact Levels

Impact LevelExample


Daily activities involving gentle, steady walking with the use of a walking aid.

Example: Moving around at home, modest walking in the community.


Daily activities involving average walking with the ability to vary speed or walking pattern.

Example: Going to the shops, confident outdoor walking.



Full Length Toe Lever

Heel Height Adjustability

Proportional Response

Split Toe



Note: Responsibility for accurate coding lies solely with the provider treating the patient. Össur assumes no responsibility or liability for the provider’s coding decisions. Össur’s coding suggestions rest on its best judgment and are subject to revision based on additional information or changes in the alpha-numeric system.

More Dynamic Solutions

More Feet

PROPRIO FOOT Specifications

PROPRIO FOOT® Product Information
Warranty Information
Amputation Level:
Impact Level: Low To Moderate
Maximum Patient Weight: 22-24:100kg (220lbs)
25-30:125kg (275lbs)
Categories: 22-24; Cat. 1-5
25-30; Cat. 1-8
Sizes: 22-30
Weight Of Foot: 1424g (50oz)
Heel Height Adjustability: ≤ 50mm (2")
Build Height Standard: 176mm (7") - 186mm (7.3")
Flex Foot Characteristics:
full length toe lever
heel height adjustability
proportional response
split toe
Foot Sizes For Unity: 25-30
Maximum Vacuum: -23inHg (600mmHg)
Normal Operating Pressure: -16-20 inHg
Added System Weight: 130g with Pump, Socket Valve and Tube


Full Length Toe Lever

Full Length Toe Lever

The full length keel/toe lever matches the length of the sound foot, providing improved support to the prosthetic limb during late stance. It ensures that users spend equal time on the prosthetic foot and natural limb, thus providing improved walking dynamics and reduced impact to the sound limb.

Benefit: Improved walking symmetry and reduced impact to the sound limb.

Heel Height Adjustability

Heel Height Adjustability

Heel height can be adjusted for various types of shoes to ensure correct alignment. Users can easily change shoes to fit most occasions as the heel height can be adjusted within the given range.

Benefits: Adjustable heel height minimizes misalignment of the prosthesis thus reducing walking fatigue and discomfort experienced with poor alignment.

Proportional Response

Proportional Response

The layering of carbon fiber, optimized through extensive computer analysis and mechanical testing, ensures that the deflection of the carbon fiber heel and forefoot components are proportional to the user’s weight and impact level.

Benefit: Customized construction optimizes walking efficiency thus reducing fatigue for the user.

Split Toe

Split Toe

A split toe feature allows the foot to adjust to uneven surfaces, allowing amputees to walk with stability and comfort on uneven ground.

Benefit: Helps to maintain balance, stability and reduces peak impact during loading.

Unity® - Sleeveless Vacuum Suspension

Unity offers the security and freedom of vacuum suspension, but without the sensation and restrictions of a sleeve. This advanced system from Össur effectively addresses volume fluctuation and is totally compatible with Flex-Foot technology.

Key advantages

  • No sleeve required: Greater mobility and user acceptance
  • 15-22 in Hg Vacuum: Effective volume stabilization
  • Simple design: Quick and easy to achieve/release vacuum
  • Independent pump: Foot function uncompromised
  • Light weight: Complete system weighs only 130g

Unity for all

With the Unity Vacuum System by Össur, there is finally an elevated vacuum system for all users. Whether an above-knee or below-knee, low active or high active, mechanical or microprocessor solution is required, the Unity Vacuum System offers the flexibility to combine a variety of Össur feet and knees to achieve the optimal combination of equipment for each unique user.

Unity is only recommended with sleeveless Seal-In technology 

Unity® Product Information
Amputation Level:
Impact Level: All
Foot Sizes For Unity: 22-30
Maximum Vacuum: -23inHg (600mmHg)
Normal Operating Pressure: -16-20 InHg
Added System Weight: 130g W/ Pump, Socket Valve And Tube
Unity® Instructions For use - Unity
Unity® Order Form