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Which artificial knee feels most natural? study pits four designs Head-to-Head

NCT ID NCT03391323

Disease control Sponsor: David F. Scott, MD 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study compared four different knee replacement devices in 218 adults with knee arthritis to see which one patients 'forget' about most after surgery. The main goal was to measure how natural the joint feels using the Forgotten Joint Score. Results could help surgeons choose the best implant for a more natural-feeling knee.

What this could mean

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

Active substance
Knee replacement devices (Medacta GMK Sphere, Medacta GMK PS, OMNI Apex, Triathlon)
What this could lead to
If successful, this study could show which knee replacement design helps patients feel more natural and less aware of their artificial joint after surgery.
What could go wrong
This is a completed study comparing existing devices, not a new breakthrough. Results may not apply to all patients or guarantee better long-term outcomes.

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

218 people

The number who actually took part.

Started

Apr 2015

Finished

Nov 2023

Lead sponsor

Other sponsor

The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.

Who can take part

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

Ages

21 to 80 years

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: * Patients willing to sign the Informed Consent. * Patients able to comply with follow-up requirements including postoperative weight bearing restrictions and self-evaluations. * Male and non-pregnant female patients ages 21 - 80 years of age at the time of surgery. * Patients requiring a primary total knee replacement. * Patients with a diagnosis of osteoarthritis (OA), traumatic arthritis (TA), or avascular necrosis (AVN). * Patients with intact collateral ligaments. Exclusion Criteria: * Patients with inflammatory arthritis. * Patients that are morbidly obese, body mass index (BMI) \> 40. * Patients with a history of total or unicompartmental reconstruction of the affected joint. * Patients with neuromuscular or neurosensory deficiency, which would limit the ability to assess the performance of the device. * Patients with a systemic or metabolic disorder leading to progressive bone deterioration. * Patients that are immunologically compromised, or receiving chronic steroids (\>30 days), excluding inhalers. * Patients bone stock is compromised by disease or infection, which cannot provide adequate support and/or fixation to the prosthesis. * Patients with knee fusion to the affected joint. * Patients with an active or suspected latent infection in or about the knee joint. * Patients whose surgery will utilize computer-assisted surgical navigation (CAOS) techniques. * Patients whose surgery will utilize minimally invasive surgical techniques. * Patients that are prisoners.

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Conditions

The condition(s) this trial relates to.

arthropathy avascular necrosis osteoarthritis osteoarthritis, knee

As listed by the trial registrant

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

Joint disease Osteoarthritis Osteoarthritis, knee

Contacts and locations

Locations

  • Spokane Joint Replacement Center

    Spokane, Washington, 99218, United States

More trials for these conditions

Other studies related to the condition(s) this trial covers.