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The relevance of the prosthetic foot

Find out more about the relevance, selection and construction of prosthetic feet.

Find out more about the relevance, selection and construction of prosthetic feet.

Overview

It’s more than a prosthetic foot. It’s a foundation.

The prosthetic foot makes everything else possible. Whether you‘re an above or below knee amputee, the quality and performance of your whole prosthesis will be impacted by the quality and performance of the prosthetic foot.


With a wide range of Ottobock prosthetic feet you can be sure that together with your O&P professional you will find the one prosthetic foot fitting to your personal needs. Whether it is a foot made out of carbon or it is a microprocessor-controlled foot – our whole portfolio is based on the same idea: building a foundation. We take our responsibility seriously. When choosing a prosthetic foot from Ottobock, you can be sure that each one is designed with passion, in compliance with highest quality standards and always with your needs in mind.

Your suitable prosthetic foot

How you and your O&P professional select the right prosthetic foot

Please note: Choosing a prosthetic foot that best suits your personal requirements, needs and goals is a complex task. Your O&P professional is an expert in this field. Thanks to his education, experience and biomechanical knowledge, he will choose the prosthetic foot that helps achieve the best possible fitting outcome for you individually. The information provided in this section only serve as a guidance. Please contact your O&P professional if you have more detailed questions.


Personal factors

Apart from all the technical selection criteria, your O&P professional will keep in mind your personal needs, living situation and goals when choosing the foot prosthesis. These factors might be the desire to participate in sports activities or the ability to paint your toenails. These are of great importance because your prosthetic foot should be like an extension of yourself.

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Amputation level

Your amputation level will be one of the first things that needs to be looked at when chosing the components in your prosthesis. An above knee amputation requires a prosthetic knee joint and the type of knee joint will help to define the appropriate prosthetic foot. This is where your O&P professional will assess the functions of the prosthetic knee joint and recommend an appropriate prosthetic foot. Because the natural knee joint is intact after a below knee amputation, your O&P professional will consider factors like length of the residual limb, strength and range of motion when recommending an appropriate foot prosthesis.

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Activity level

Manufacturers categorise prosthetic feet by the user’s activity level – also called mobility grade. This means that not every prosthetic foot can be used by every user. Selecting a prosthesis that matches your activity level will maximise your mobility and your quality of life. Here are some very basic indications for identifying your activity level. If you are on the border between two activity levels, your O&P professional will consider multiple products to assess the one that is best for you.

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Build height

Prosthetic feet vary in height. We call the height of a prosthetic foot build height. Your height and the length of your residual limb as a below knee amputee will determine the space you have for a prosthetic foot and what is the appropriate build height for the prosthetic foot. As an above knee amputee, the length of the prosthetic knee joint will be an additional factor to consider for the build height of the prosthetic foot.

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Body weight

Prosthetic feet are designed for a specific weight range. To ensure that a prosthetic foot performs well for you, your O&P professional will choose one suited to your weight class.

Foot size

Like human feet, prosthetic feet differ in length and size. Prosthetic feet are sized by cm rather than standard shoe sizes. Every foot is available in a specific range of sizes. There are prosthetic feet that come in sizes for children while others are even sized for large adults. Ottobock running blades and specialty sports feet often have a a single size.

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All about prosthetic feet

Specific information about prosthetic feet

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Comfort

A foot prosthesis has to feel good for you to meet your activity goals.

A foot prosthesis has to feel good for you to meet your activity goals.

An amputee is accompanied by a physical therapist as they trial a prosthetic foot in a rehabilitation center

Function

Prosthetic feet are designed to mimic a human foot at a specific activity level. For lower activity individuals, a prosthetic foot is designed to provide stability and balance. For those who are most active, a prosthetic foot must mimic the natural foot during the act of walking. It must act as a shock absorber as you strike your heel to the ground, adapt to uneven terrain, provide a smooth rollover from heel to toe, and provide a rigid lever for propelling forward when you finish your step (“toe-off”).

Prosthetic feet are designed to mimic a human foot at a specific activity level. For lower activity individuals, a prosthetic foot is designed to provide stability and balance. For those who are most active, a prosthetic foot must mimic the natural foot during the act of walking. It must act as a shock absorber as you strike your heel to the ground, adapt to uneven terrain, provide a smooth rollover from heel to toe, and provide a rigid lever for propelling forward when you finish your step (“toe-off”).

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Multi-axial motion

Some prosthetic feet are designed to mimic the ankle which allows the foot to move in multiple planes. Multi-axial capability in a foot allows the foot to absorb varying terrain by moving in all directions. These motions are forward to back, side to side and rotation around the ankle. Multi-axial motion is needed to walk comfortably and confidently on uneven ground where your foot must adapt to whatever it encounters.

Some prosthetic feet are designed to mimic the ankle which allows the foot to move in multiple planes. Multi-axial capability in a foot allows the foot to absorb varying terrain by moving in all directions. These motions are forward to back, side to side and rotation around the ankle. Multi-axial motion is needed to walk comfortably and confidently on uneven ground where your foot must adapt to whatever it encounters.

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The Basics

Designing prosthetic foot systems is challenging. It’s very difficult to reproduce the complex workings of the human foot and ankle. Ideally the foot will be light because its weight is added to the rest of the prosthetic leg. If the foot is too heavy and the suspension of the prosthesis is not appropriate, the connection to the socket and your limb will be affected and also the overall function of the prosthesis.

Designing prosthetic foot systems is challenging. It’s very difficult to reproduce the complex workings of the human foot and ankle. Ideally the foot will be light because its weight is added to the rest of the prosthetic leg. If the foot is too heavy and the suspension of the prosthesis is not appropriate, the connection to the socket and your limb will be affected and also the overall function of the prosthesis.

A good prosthetic foot should also be strong, as it will be taking on large forces and torque as you walk and run. Feet must also be small enough to fit within a footshell, a cosmetic covering for the prosthetic foot, and thus fit within a shoe. Being light, strong, and small, and yet functional and durable is the challenge.

Early designs for prosthetic feet were often a solid piece of wood. A similar design, the SACH foot (solid-ankle-cushioned-heel) is still in use because of its sturdy function. It is especially useful for individuals with lower activity levels. A SACH foot typically has a rigid inner structure (wood or plastic) surrounded by a compressible foam cosmetic shell.

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The cosmetic shell

Today’s more sophisticated feet add more functions and are secured inside a cosmetic shell. Most people never see their prosthetic foot without this exterior shell. The cosmetic shell stretches around the prosthetic foot and serves two purposes:

Today’s more sophisticated feet add more functions and are secured inside a cosmetic shell. Most people never see their prosthetic foot without this exterior shell. The cosmetic shell stretches around the prosthetic foot and serves two purposes:

  • It makes your prosthetic foot look like an anatomical foot.

  • It fits snugly in your shoe.

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Materials

The materials in a prosthetic foot differ by activity level. Wood, plastic and foam are usually found in feet designed for individuals who have low activity levels and require stability. Lightweight carbon fibre feet meet the functional needs of active individuals since they are built for shock absorption and energy efficiency.

The materials in a prosthetic foot differ by activity level. Wood, plastic and foam are usually found in feet designed for individuals who have low activity levels and require stability. Lightweight carbon fibre feet meet the functional needs of active individuals since they are built for shock absorption and energy efficiency.

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Prosthetic foot portfolio

Prosthetic feet from Ottobock

Each user is different and each user has different individual habits, preferences and goals. To meet your individual requirements and those of other users, it is not purposeful to provide one prosthetic foot for everyone but to have different foot prostheses for different user profiles. Our prosthetic feet cater to your individual needs – convince yourself.

An elderly couple enjoys a stroll outside. The elderly man wears Ottobock's Terion foot to assist with his walk.
Prosthetic feet

Less active individuals

Designed for less active individuals who mainly navigate indoor environments and will utilise a walking aid for outdoor ambulation and place a high value on dependable support from their prosthetic foot.

Designed for less active individuals who mainly navigate indoor environments and will utilise a walking aid for outdoor ambulation and place a high value on dependable support from their prosthetic foot.

An amputee joyfully carries a potted plant through an outdoor garden. She is wearing the Ottobock Trias prosthetic foot.
Prosthetic feet

Moderately active individuals

Designed for moderately active individuals who navigate indoor and familiar outdoor environments and place a high value on consistent stability when walking.

Designed for moderately active individuals who navigate indoor and familiar outdoor environments and place a high value on consistent stability when walking.

Two men transport various fishing equipment through a forest. The man in the forefront of the photo sports the custom Ottobock Taleo bionic foot on his right leg.
Prosthetic feet

Active individuals

Designed for active individuals who navigate varied indoor and outdoor environments and place a high value on effortless walking and the ability to go wherever life takes them.

Designed for active individuals who navigate varied indoor and outdoor environments and place a high value on effortless walking and the ability to go wherever life takes them.

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Prosthetic feet

Highly active individuals

Designed for highly active individuals who navigate varied indoor and outdoor environments and place a high value on uncompromised response and control even when performing high impact activities.

Designed for highly active individuals who navigate varied indoor and outdoor environments and place a high value on uncompromised response and control even when performing high impact activities.

A group of friends play volleyball on a sand beach court. A man is leaping to spike the ball over the net and utilizes his made-by-order Ottobock Challenger.
Prosthetic feet

Recreational athletes

Designed for everyone who participates in recreational sports while performing agile and powerful movements.

Designed for everyone who participates in recreational sports while performing agile and powerful movements.

An athlete runs on an outdoor road thanks to his custom Ottobock Runner prosthetic foot
Prosthetic feet

Athletes

Designed for everyone who wants to use the same running blade that even elite athletes use.

Designed for everyone who wants to use the same running blade that even elite athletes use.

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This is what you can rely on

heritage

Heritage

For generations, Ottobock feet have helped define what’s possible with a lower limb prosthesis. With every step, our feet carry on the traditions of craftsmanship, invention and passion – that continue to set our products apart.

For generations, Ottobock feet have helped define what’s possible with a lower limb prosthesis. With every step, our feet carry on the traditions of craftsmanship, invention and passion – that continue to set our products apart.

A silicon prosthetic foot being built

Quality

Every detail within a prosthetic foot can make a difference for your daily life. That’s why when designing a foot, we treat every detail like it’s the most important one. Built to the same exceptional standard, our feet start and end with your needs.

Every detail within a prosthetic foot can make a difference for your daily life. That’s why when designing a foot, we treat every detail like it’s the most important one. Built to the same exceptional standard, our feet start and end with your needs.

An O&P professional aids an amputee during their trial of a bionic foot

Trust

If you decide together with your O&P professional for an Ottobock foot, you can trust that you have chosen a foot that has been meticulously designed, rigorously evaluated and preferred by amputees around the world.

If you decide together with your O&P professional for an Ottobock foot, you can trust that you have chosen a foot that has been meticulously designed, rigorously evaluated and preferred by amputees around the world.

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FAQs

Frequently asked questions

Contact us

Your questions about prosthetic feet are not yet answered?

If you have any questions about prosthetic feet, please feel free to contact us using our contact form.

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