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Vitamin c trial aims to ease persistent pain after knee surgery

NCT ID NCT06123715

Symptom relief Sponsor: University Health Network, Toronto Source: ClinicalTrials.gov ↗

What the study statuses mean

This study's is highlighted.

Recruitment status, easiest to join first

Recruiting now This study
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 Results may not be published yet.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
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This status has not been confirmed recently, so it may be out of date.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 25, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study tests whether taking vitamin C around the time of knee replacement surgery can reduce long-term pain. About 400 adults having knee replacement will be randomly assigned to receive vitamin C or a placebo for 8 weeks. The main goal is to see if a larger study is possible, but researchers will also track pain levels for a year.

What this could mean

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

Active substance
Vitamin C (ascorbic acid)
What this could lead to
If it works, this could point toward a simple, low-cost way to reduce chronic pain after knee replacement surgery.
What could go wrong
This is a small pilot study focused on feasibility, not proof of effectiveness. Vitamin C may not reduce pain, and results may not apply to all patients.

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

Phase 2

Tests whether the treatment actually works, and watches for side effects, in a larger group.

Participants

About 400 people

The number the study aims to enrol. It can still change while the study runs.

Started

Apr 2024

Expected to finish

Dec 2027

An estimate. End dates often move.

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

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: * Patients \>18 years old * Undergoing a unilateral or bilateral primary total knee arthroplasty for advanced osteoarthritis of the knee Exclusion Criteria: * TKA for infection (septic joint), fracture, ankylosing spondylitis, lupus, or psoriatic arthritis * History of kidney stones, acute or chronic renal failure, hemochromatosis, or glucose-6-phosphate deficiency * Unlikely to comply with follow-up (e.g., no fixed address, plans to move out of town) * Language difficulties that would impede valid completion of questionnaires * Planned staged bilateral TKA * Treating surgeon deems patient inappropriate for inclusion in trial * Any allergy or sensitivity to milk * Pregnant or planning to become pregnant during the study

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Conditions

The condition(s) this trial relates to.

Chronic Pain chronic pain syndrome osteoarthritis, knee Pain, Postoperative

As listed by the trial registrant

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

Chronic pain Knee pain chronic Post operative pain

How to take part

Only the study team decides who joins. These are the ways to reach them.

  1. The places running it

    3 sites. The list below names each one and where it is.

  2. The official record

    ClinicalTrials.gov lists the study team's own contact details, including names and phone numbers. We don't republish those.

    Open the record ↗

  3. A doctor treating you

    A doctor who knows your case can contact a study site on your behalf, and can tell you whether this study is worth pursuing at all.

Contacts and locations

Locations

  • Mount Sinai Hospital

    RECRUITING

    Toronto, Ontario, M5G 1X5, Canada

  • Sunnybrook - Holland Centre

    RECRUITING

    Toronto, Ontario, M4Y 1H1, Canada

  • Toronto Western Hospital

    RECRUITING

    Toronto, Ontario, M5T 2S8, Canada

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