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Knee replacement showdown canceled before it started

NCT ID NCT04103502

Knowledge-focused Sponsor: The University of Tennessee, Knoxville 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
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 Results may not be published yet.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 This study
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This status has not been confirmed recently, so it may be out of date.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 aimed to compare knee movement in people who had one of two different total knee replacements. Researchers planned to measure how the knee bends and shifts during activities like stepping up and deep knee bends. The study was withdrawn before any participants were enrolled, so no results are available.

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.

Expected to start

May 2025

An estimate. Start dates often move.

Finished

Dec 2025

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.

Who is studied

There will be ten subjects with the MicroPort implant and ten with the DePuy Attune implant; however, we will increase enrollment to 24 subjects (12 in each group) to ensure that researchers acquire the necessary 20 usable datasets for analysis and also to account for any subjects that may drop out of the study. All TKAs should be judged clinically successful based on the surgeon's evaluation and each patient's Forgotten Knee Score. Each subject should have a well-functioning prosthesis, be at least six months post-operative, and should have good-to-excellent post-operative passive flexion

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: * Subjects will have either a MicroPort Medial Pivot or DePuy Attune PCR TKA. * Subjects must be at least six months post-operative. * Participants must be judged clinically successful based on the surgeon's evaluation and their Forgotten Knee Score. * Participants must be able to perform the required activities - stepping up and a deep knee bend. * Subjects must be willing to sign the Informed Consent (IC) / HIPAA form to participate in the study Exclusion Criteria: * Pregnant, potentially pregnant or lactating females. To satisfy radiation protocol, each female subject will be asked if she is pregnant, or possibly could be pregnant. A pregnant person will not be allowed to participate in the study. * Subjects without one of the two types of knee implants under investigation. * Subjects who are unable to perform stepping up and deep knee bend. * Subjects who are unwilling to sign Informed Consent/ HIPAA documents. * Does not speak English.

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Conditions

The condition(s) this trial relates to.

Knee Injuries osteoarthritis, knee

As listed by the trial registrant

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

Knee imlant Knee injuries Osteo arthritis knee Total knee arthroplasty

Contacts and locations

Locations

  • Nevada Orthopedic & Spine Center

    Las Vegas, Nevada, 89128, United States

  • Platinum Training/MERIN

    Las Vegas, Nevada, 89130, United States

  • The University of Tennessee

    Knoxville, Tennessee, 37934, United States

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