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Can a motorized knee help amputees walk more? trial puts it to the test

NCT ID NCT05267639

Symptom relief Sponsor: Liberating Technologies, Inc. Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed This study
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Sep 17, 2026 · Last updated Sep 18, 2026 · Updated 1 time

Summary

Researchers are comparing a powered prosthetic knee with a standard microprocessor-controlled knee in people who have an above-knee amputation and are highly active. Participants will use each knee for three months while wearing an activity monitor to track daily steps. The study also measures balance confidence and well-being through questionnaires. The goal is to gather real-world data that could help doctors choose the best prosthetic knee for each patient.

What this could mean

Our plain-language read of the trial. This is informational only, not medical advice or a prediction.

Active substance
Powered prosthetic knee (Ossur Power Knee)
What this could lead to
If powered knees help, this could guide doctors to prescribe the right prosthetic knee for each patient, improving mobility and confidence for people with above-knee amputations.
What could go wrong
This is a small study of 13 highly active participants, so the results may not apply to less active amputees. Powered knees are complex and expensive, and they may not outperform simpler devices for everyone.

This is an AI summary of the original study and may miss details. Read our disclaimer.

Study facts

What this study's own registry entry says, in plain language.

Phase

Not a phased trial

Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.

Participants

13 people

The number who actually took part.

Started

May 2022

Finished

Aug 2024

Lead sponsor

A company

The lead sponsor is a pharmaceutical, biotech, or medical-device company.

Who can take part

This study's own entry requirements. Only the study team can say for certain whether you qualify.

Ages

18 years and older

Sex

Anyone

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show the full entry requirements

Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.

Inclusion Criteria: * Are at least 18 years old * Unilateral transfemoral prosthesis user (limb absence between the knee and hip) * Current user of a microprocessor-controlled knee (MPK) * Have adequate clearance between distal end and ground for necessary knee and foot components * Medicare Functional Classification Level (K-Level): 4 * Socket-Comfort Score: 6 or above to ensure adequate socket fit * PLUS-M T-score of 55 or above * Six months or more experience on a prosthesis * Body weight between 50kg and 116kg (110lbs - 256lbs) Exclusion Criteria: * Present injuries to residual limb or contralateral leg affecting functional ability * Socket issues/changes in the last 6 weeks * Users with bone-anchored implants Subjects can be excluded at the discretion of the investigator for other unforeseen disqualifying criteria (such as specific cognitive issues, etc.). Subjects in this study will not be discriminated by sex/gender or race/ethnicity. Using a knee that the subject is unfamiliar with may increase the risk of falling. Therefore, pregnant women should not participate in the study and will be screened by self-disclosure.

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Conditions

The condition(s) this trial relates to.

injury

As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

Amputation Amputation; traumatic, leg, lower Amputation; traumatic, leg: thigh, between hip and knee Limb; absence, congenital, lower Lower limb amputation above knee (injury) Prosthesis user

Contacts and locations

Locations

  • Hanger Clinic

    Austin, Texas, 78758, United States

  • Liberating Technologies, Inc.

    Holliston, Massachusetts, 01746, United States

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