Your 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.
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With a wide range of Ottobock prosthetic feet you can be sure that together with your Prosthetist you will find the one to suit 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.
In addition from giving you more insights into our prosthetic foot portfolio, we have compiled some useful information on selection criteria, general insights about prosthetic feet, and frequently asked questions. We believe that the more you understand about how your prosthetist selects the right foot for you, the more actively you can engage in the fitting process. This collaboration ensures a satisfying outcome that meets your expectations.
Designing a prosthetic foot is complex, it’s difficult to reproduce the natural movement of the human foot and ankle. Ideally, a prosthetic foot should be lightweight because its weight is added to the rest of the prosthetic leg. If the foot is too heavy and the suspension system is inadequate, the connection between the socket and your limb may be compromised, affecting the overall function of the prosthesis.
In addition to being light, a prosthetic foot must also be strong. It needs to withstand the significant forces and torque generated during walking and running. While also being small enough to fit within a foot shell and shoes. Being light, strong and small whilst still remaining functional and durable i s the primary challenge in prosthetic foot design.
Early prosthetic foot designs were often made from a solid piece of wood. A similar concept, the SACH (solid-ankle cushioned-heel) foot, remains in use today due to its sturdy and reliable function, especially for individuals with lower activity levels. The SACH foot typically features a rigid core (wood or plastic) encased in a compressible foam cosmetic shell.
Modern prosthetic feet offer advanced features and are secured in a foot shell. Most users never see their prosthetic foot without this outer covering. The cosmetic shell serves two key purposes: it gives the prosthetic foot a natural, anatomical appearance, and it allows the prosthetic foot to fit securely within a shoe.
What's inside the shell can vary significantly, as prosthetic feet are designed to accommodate different lifestyles and activity levels. Here are some important factors to consider when choosing a prosthetic foot:
Choosing a prosthetic foot that best suits your personal requirements, needs and goals is a complex task. Your Prosthetist is an expert in this field. Thanks to their education, experience and biomechanical knowledge, they will choose the prosthetic foot that helps achieve the best possible fitting outcome for you individually.
Please note: The information provided in this section only serves as a guidance. Please contact your Prosthetist if you have more detailed questions.
A prosthetic foot, or foot prosthesis, is an artificial replacement for part or all of your natural foot. Prosthetics substitute for body parts that you don’t have or that don’t work as they should. A prosthetic foot is primarily a mobility aid. It can enable you to walk on two feet when you couldn’t otherwise.
You might use a prosthetic foot if you’ve had a lower extremity or foot amputation. Common reasons for lower extremity amputations include tumors, trauma, infection and peripheral arterial disease. Diabetes-related foot conditions are the most common reason for foot amputations, specifically.
Different types of prosthetic feet offer different levels of functionality. Some are more rigid, and others move in different ways. Some offer more stability, and others more flexibility. Some accommodate more active lifestyles. Your prosthetist will help you select the right prosthesis for your needs and goals.
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Types include:
The SACH foot is the simplest type of prosthetic foot, and often the first type you’ll use. For most people, it’s not a permanent solution but a temporary one that you’ll wear until your permanent foot is ready. It has a rigid keel (center), with foam molded in the shape of a foot around it, and a rigid ankle.
The keel is the weight-bearing center of the foot that mimics the function of your foot’s arch. It provides support and shock absorption when you walk. A flexible keel stores and transfers energy as you walk by bending a little when you put weight on it. A rigid keel doesn’t do this, so walking is a bit clunkier.
An elastic keel or flexible keel foot is similar to a SACH foot, except that the keel gives a little when you walk. This helps the foot accommodate uneven terrain a little better. Everything else in the foot is rigid, making it very stable and easy to control. This foot can be helpful for limited walking if your leg is weak.
Axial feet have mechanical ankle joints that mimic the movement of a natural ankle. There are two types: single-axis and multi-axis. A single-axis ankle moves up and down to help the foot accommodate an incline or decline. A multi-axis ankle also moves side to side, which helps with uneven surfaces.
Axial feet allow limited walkers to walk in more places. They’re heavier than the simpler models, but they’re durable and offer good stability, especially for those with weak or unstable knees. The moveable ankles help to absorb some of the stress of walking that might otherwise transfer to your leg.
A hydraulic ankle-foot uses compressed fluid, such as water or oil, to provide a smooth, rocking motion at the ankle, heel and ball of the foot. This imitates the movement of a natural foot in different walking phases. Hydraulics provide good shock absorption and reduce pressure on the prosthesis socket.
A dynamic response foot provides more flexibility for more physically active users. It’s a contoured foot made with strong but flexible materials, like carbon fiber and foam, that spring back when you push off it. This helps to recycle some of the force you generate by walking, so it takes less energy to walk.
Dynamic response feet are also called energy-storage-and-return (ESAR) feet. They walk for longer distances with more comfort and with a more natural gait than simpler models. They can change speed or direction with ease, making them versatile for many uses. Most sports feet are ESAR models.
A microprocessor foot has computer chips and sensors that detect how you’re using the foot and what the terrain is like and make automatic adjustments. This improves overall mobility and relieves stress and strain when walking. Because it uses advanced technology, it’s sometimes called a bionic foot.
Microprocessor feet are battery-powered and require charging at night. They’re more expensive and less durable than other models, and you can’t let them get too wet or dirty. They’re also heavier, although some models use their electric power to help propel the foot, doing some of the work for you.
You might use an alternate prosthetic foot for certain sports or activities. Some of these include:
If you have a partial foot amputation, you might benefit from a partial foot prosthesis. Options include:
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