Fillauer’s Raize Foot is a lightweight, low-profile microprocessor foot/ankle. Its microprocessor actively manages flexion resistance for a smoother rollover during the Stance Phase of the gait cycle. It also allows users to adjust heel height to accommodate different shoes. Weighing substantially less than its competitors but also supporting a lower maximum user weight, as well as offering less dust and water resistance, it appears to be best suited for light duties in ideal operating environments.
A Quick Look at the Raize Foot
The following video begins as a pure commercial but has some good footage of the Raize Foot in action, starting at the 0:40 mark:
We are not comfortable providing our first impression of the Raize because we have been unable to find additional video footage or independent reviews.
Raize Foot’s Key Features
Ankle Range of Motion (ROM)
The maximum ankle ROM for the Raize Foot is 28 degrees, which is roughly average for microprocessor feet/ankles.
However, this number is not always reliable as some ROM values include the ROM of the foot component in addition to ankle ROM, while some do not.
Also, Raize’s ROM can be reduced by its heel settings.
The Raize Foot uses a within-step ankle accommodation strategy. This means that the ankle adjusts to the terrain during the Stance Phase of each step instead of the Swing Phase. Within-step systems generally respond more quickly to terrain changes than those that adjust during the Swing Phase (described as “inter-step”).
Electric Power for Push-Off
The Raize Foot does not augment push-off with electric power. We suspect that it provides some energy storage and reuse through its carbon fiber foot. However, there is no mention of this in Fillauer documentation, so it is obviously not a prominent feature.
The only microprocessor foot/ankle currently on the market that enhances push-off with electric power is Ottobock’s Empower Ankle.
Raize Foot’s Sensor and Microprocessor Capabilities
Fillauer’s documentation on the Raize does not contain detailed information on its sensor and microprocessor capabilities.
We do know that the microprocessor controls the hydraulic resistance for both plantar flexion and dorsiflexion during the Stance Phase.
The microprocessor does not appear to actively manage dorsiflexion (i.e. keeping the toes up) during the Swing Phase. Nor does it automatically compensate for heel height, though both the user and the prosthetist can adjust heel height via software.
Because it is difficult to get detailed information on these capabilities from the manufacturer, we strongly recommend asking your prosthetist about the exact behavior of the foot when walking, especially on varied terrains. Ankle accommodation and microprocessor strategies differ significantly from one manufacturer to the next, making patient compatibility a major factor.
The independent data we have from August 2018 states that the Raize Foot’s battery life is 18 hours.
Water Proofing and Dust Resistance
The Raize Foot is listed only as being splash resistant. It is not recommended for use in dusty or dirty environments.
The Raize Foot weighs only 750 grams. This is by far the lightest of all microprocessor feet/ankles.
User Weight Limit
The maximum user weight for the Raize Foot is 100 kilograms. This is 25 kg less than all its microprocessor foot/ankle competitors.
The Raize Foot is rated for low-to-moderate-impact K3 use. It is not intended for high-impact sports, such as running, basketball, etc.
The Raize offers a remote application that allows users to adjust both heel height and flexion resistance:
The application is available for both Android and IOS devices.
The Raizer Foot offers a two-year limited warranty, which matches the warranty of Ossur’s Proprio Foot but is less than the three-year warranty offered by all other microprocessor feet/ankles.
We do not have good information on Raize pricing. We are actively seeking this information and will update this article as soon as we can verify a price.
Considerations Before Buying a Raize Foot
The one point that stands out about the Raize is that it is a lightweight microprocessor foot/ankle. It can only support weights up to 100 kg. Its water and dust resistance ratings are lower than all of its competitors. And based on the fact that Fillauer doesn’t mention the energy storage and release capacity of its carbon fiber foot component, we have to assume that this is not a major feature.
Given these limitations, we expect that the Raize Foot is available at a lower price than its competitors. If this is indeed the case, then it might offer a good value proposition for certain types of users.
We are searching for prosthetists with more intimate knowledge of the Raize and will update this article as soon as we have more information.
For more information on lower limb bionics, see Understanding Bionic Legs & Feet.
For a list of competitor devices, see All Bionic Feet.
Click here for more information on Fillauer.