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Knee replacement showdown: fixed vs. mobile bearing – which is better?

NCT ID NCT00435357

Disease control Sponsor: Hospices Civils de Lyon 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 27, 2026 · Last updated Jun 27, 2026

Summary

This study compared two types of total knee replacements in 160 patients with medial knee arthritis. One group received a fixed-bearing implant, the other a mobile-bearing implant. Researchers measured knee function and X-ray results to see if one design leads to better outcomes.

What this could mean

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

Active substance
total knee replacement (fixed-bearing or mobile-bearing device)
What this could lead to
If one design proves clearly better, it could guide surgeons to choose the best implant for patients with knee arthritis.
What could go wrong
This is a completed, moderate-sized trial, but results may not apply to all types of knee arthritis or to patients with prior knee surgeries.

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

160 people

The number who actually took part.

Start date

Feb 2007

Finished

Jul 2009

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

50 to 90 years

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: * Medial medial femorotibial arthritis requiring an arthroplasty * Age between 50y and 90y Exclusion Criteria: * Lateral femorotibial arthritis * Inflammatory disease * Stiff knee with flexion under 90° * Revision TKA * Previous surgery (except meniscectomy)

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Conditions

The condition(s) this trial relates to.

osteoarthritis, knee Patella Fracture

As listed by the trial registrant

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

Knee arthritis

Contacts and locations

Locations

  • Sebastien Lustig

    Lyon, 69300, France

More trials for these conditions

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