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Knee implant movement measured to boost future joint replacements

NCT ID NCT02861794

Knowledge-focused Sponsor: Oslo University Hospital 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 looked at how much a new knee implant (GMK Sphere) moves inside the body over five years in 44 people with knee osteoarthritis. Researchers used a special X-ray technique to measure implant stability. The goal was to gather data to help design better knee replacements that feel more natural and last longer.

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

44 people

The number who actually took part.

Started

May 2016

Finished

Dec 2024

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 75 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: * Patients with knee osteoarthritis Exclusion Criteria: * Preoperative severe deformity (Femoro-tibial angle \< 175°or \> 190°measured on a full-length leg image at weight bearing) * Preoperative flexion contracture more than 15° * Preoperative limited range of motion under anesthetics (less than 110°) * Less than 50 or more than 75 years of age at the time of surgery * Use of walking aids because of other musculoskeletal and neuromuscular problems * Preoperative diagnosis other than osteoarthritis and avascular necrosis (e.g. rheumatoid arthritis, tumors) * Revision arthroplasty * Obesity with BMI \>35 * Impaired collateral ligaments * Malposition of femoral and tibial implants (Internally rotated or more than 10° externally rotated implants will be excluded. The rotation of femoral implant is measured on postoperative CT images in reference to surgical epicondylar line. The rotation of tibial implant is determined according to Berger's measurement) * Postoperative revision surgery due to deep wound infection

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Conditions

The condition(s) this trial relates to.

osteoarthritis, knee

As listed by the trial registrant

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

Knee osteoarthritis

Contacts and locations

Locations

  • Oslo University Hospital

    Oslo, Oslo, 0470, Norway

More trials for these conditions

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