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Why do knees get weaker after surgery? new study digs in

NCT ID NCT03051984

Knowledge-focused Sponsor: University of Vermont 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 why leg muscles shrink and get weaker right after total knee replacement surgery. Researchers studied 23 adults with knee osteoarthritis before and after their operation. They measured muscle fibers, energy-producing parts of cells, and physical activity to find the root causes of this muscle loss, hoping to guide future treatments.

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

23 people

The number who actually took part.

Started

Jan 2017

Finished

Jun 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

50 to 75 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: * symptomatic, primary knee osteoarthritis (OA) * being considered for total knee arthroplasty Exclusion Criteria: * knee OA secondary to inflammatory/autoimmune disease * untreated/uncontrolled hypertension, diabetes or thyroid disease * chronic heart failure, actively-treated malignancy, exercise-limiting peripheral vascular disease, stroke or neuromuscular disease * body mass index \>38 kg/m2 * lower extremity blood clot or known coagulopathies * implanted pacemaker/ICD

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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 osteoarthristis

Contacts and locations

Locations

  • University of Vermont College of Medicine

    Burlington, Vermont, 05405, United States

More trials for these conditions

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