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Bionic knee aims to make walking easier for amputees

NCT ID NCT04787627

Symptom relief Sponsor: Össur Iceland ehf 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 26, 2026 · Last updated Jun 26, 2026

Summary

This study tested a new powered prosthetic knee called Power Knee in 17 people with above-knee amputations. The goal was to see if it reduces effort during walking compared to their usual microprocessor knee. Participants walked for 6 minutes and rated their exertion. The study also looked at daily activities like stairs and sitting.

What this could mean

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

Active substance
Power Knee (powered microprocessor controlled prosthetic knee)
What this could lead to
If successful, this powered knee could make walking easier and less tiring for people with above-knee amputations.
What could go wrong
This was a small, early study with only 17 people. The device may not work better for everyone, and it might be heavy or require more training.

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

17 people

The number who actually took part.

Started

Nov 2019

Finished

Jul 2020

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

Not accepted

This study is not open to healthy volunteers. The entry requirements below say who it is open to.

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: * 50Kg\< body weight \< 116Kg * K3-K4 amputees with unilateral transfemoral amputation or Knee disarticulation * Allows for 37mm knee center height to dome of pyramid alignment * Currently using a MPK or Power Knee * Older than 18 years old * No socket issues/changes in the last 6 weeks and no socket changes expected during the duration of the study period. * Comfortable and stable socket fit * Willing and able to participate in the study and follow the protocol Exclusion Criteria: * 50Kg\> body weight \> 116Kg * Bilateral amputees * Users with socket problems * Users with co-morbidities in the contra-lateral limb, which affect their functional mobility * Younger than 18 years old * Users with stump pain * Users with cognitive impairment * Users not involved in other clinical tests and/or receiving treatment that the testing might affect.

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As listed by the trial registrant

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

Amputation Prosthesis user

Contacts and locations

Locations

  • Medical Center Orthotics and Prosthetics

    Silver Spring, Maryland, 20910, United States

  • Medical Center Orthotics and Prosthetics

    Boston, Massachusetts, 02134, United States

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