PROPRIO FOOT microprocessor controlled prosthetic ankle by Össur adapts to changing terrain so you can walk naturally and effortlessly – even on stairs and inclined surfaces.

PROPRIO FOOT® — Because the world isn't flat. Ossur.com

In 2006, we debuted the original Proprio Foot. Featuring motorised ankle flexion, the goal was simple: to reduce trips and falls. It was a hit, winning the prestigious Red Dot design award and spawning an entire new product category. However, since our ultimate goal is to replicate the function of the human foot, there is always room for improvement.

In redesigning Proprio Foot, we first enhanced the safety and stability features that made the original so great for low-to-moderately active users in the first place. Next, we incorporated a Pro-Flex LP foot module to provide 44% more toe-off power and we added usability improvements like single-button functionality and an integrated battery. And recently we took another giant step closer to our goal with
making the foot fully waterproof in salt and fresh water*. 

Proprio Foot redefines what is expected from an MPA, truly delivering the freedom to move naturally with safety and stability.
*Not recommended for pool usage. See Instructions for Use for more info.

Safety first. Proprio Foot adapts to varied terrain, helping users walk naturally and comfortably on a variety of everyday terrain, including stairs and ramps. It also features 4° of active swing phase dorsiflexion, contributing to a 70% reduction in falls.

The power of Pro-Flex. The new Proprio Foot is built on a Pro-Flex LP foundation. As a result, it delivers a 44% increase in toe-off power and a 23% increase in ROM (of the underlying carbon fiber foot) over the previous model. It also provides reduced sound side loading.³

It’s so easy! Automatic setup makes customising Proprio Foot for each user’s unique gait simple. Plus, the new Proprio Foot features a sleek new design with an integrated battery that provides 20-42 hours of use. A single button makes it easy to see the battery charge level and align the ankle for different footwear with up to 2” (5 cm) of heel height.

No umbrella? No problem! To fully enjoy activities, the Proprio Foot is rated IP67**, which means it tolerates fresh, soap and salt water, to enjoy a family beach afternoon at the ocean, take a shower or swim in a lake without even thinking about it.

* 20-42 hours depending on usage
** Not recommended for pool usage. See Instructions for Use for more info

The Proprio Foot features an Össur Logic app that enables professionals to easily setup the foot, adjust the functionality for each user and access valuable activity reports. A new, enhanced user interface lets you quickly check your battery charge and step count, plus adjust ankle alignment to accommodate a variety of everyday footwear (up to 2”/5cm heel height).


NOTE: Össur Logic is available for iOS devices (iOS 10.0 or later) and pairs via Bluetooth. It can be downloaded free of charge from the App Store.

Compared to the previous Proprio Foot. Data on file at Össur.

Compared to a traditional Energy Storing and Return Foot (ESAR). Ludviksdottir A, Gruben K, Gunnsteinsson K, Ingvarsson Th, Nicholls M. Effects on user mobility and safety when changing from a carbon fiber prosthetic foot to a bionic prosthetic foot. Presented at Orthopadie&Reha-Technik Congress, Leipzig, May 2012.

David Jonsson M.Sc., Comparison Of Level Ground Performance Of Three Microprocessor Ankles, AOPA National Assembly, September 9-12, 2020 in Las Vegas, NV.

Rosenblatt NJ, Bauer A, CPO, Rotter D, CPO, Grabiner MD. Active dorsiflexing prostheses may reduce trip-related fall risk in people with transtibial amputation. J Rehabil Res Dev. 2014;51(8):1229–42.

Darter BJ, Wilken JM. Energetic consequences of using a prosthesis with adaptive ankle motion during slope walking in persons with a transtibial amputation. Prosthetics and orthotics international. 2014;38(1):5–11.

Agrawal V, Gailey RS, Gaunaurd IA, O’Toole C, Finnieston A, Tolchin R. Comparison of four different categories of prosthetic feet during ramp ambulation in unilateral transtibial amputees. Prosthet Orthot Int. Oktober 2015;39(5):380–9.

Fradet L, Alimusaj M, Braatz F, Wolf SI. Biomechanical analysis of ramp ambulation of transtibial amputees with an adaptive ankle foot system. Gait & posture. 2010;32(2):191–198.

Alimusaj M, Fradet L, Braatz F, Gerner HJ, Wolf SI. Kinematics and kinetics with an adaptive ankle foot system during stair ambulation of transtibial amputees. Gait & posture. 2009;30(3):356–363.

Heitzmann DWW, Alimusaj M, Braatz F, Wolf SI. Preliminary results of trans-femoral amputees walking with a microprocessor controlled prosthetic foot. Gait & Posture. Juni 2012;36, Supplement 1:S9.

Ludvigsdottir AG, Gruben K, Gunnsteinsson K, Ingvarsson T, Nicholls. Effects on user mobility and safety when changing from a carbon fibre prosthetic foot to a bionic prosthetic foot. Congress ORTHOPAEDIE + REHA-TECHNIK 2012; 2012.

Delussu AS, Brunelli S, Paradisi F et al. Assessment of the effects of a bionic foot on energy cost of walking and quality of life in transtibial amputees: preliminary data. Abstract, Orthopadie&Reha-Technik Congress, Leipzig. 2012.

*Waterproof details. Proprio Foot will tolerate exposure to freshwater, salt water, perspiration, urine, mild soaps, sand, dust, and dirt. Exposure to chlorinated water is not recommended as it may compromise the actuator grease/lubrication, affecting functionality of the foot. Structural integrity is not affected in any way. Devices experiencing issues related to chlorine exposure can be serviced under warranty.