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Can magnetic pulses rebuild hamstring strength after ACL surgery?

NCT ID NCT06464705

Symptom relief Sponsor: Chinese University of Hong Kong 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 12, 2026 · Last updated Aug 13, 2026 · Updated 1 time

Summary

This trial tests whether pulsed electromagnetic field (PEMF) therapy can improve hamstring muscle strength recovery in people who had ACL reconstruction using their own hamstring tendon. Participants will receive either real PEMF or a placebo treatment, with both groups using the same machine. The goal is to see if PEMF helps the donor site heal better and reduces the common muscle weakness after surgery.

What this could mean

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

Active substance
Pulsed electromagnetic field (PEMF) therapy, a non-invasive device that delivers magnetic pulses to the knee to promote tissue repair and muscle regeneration.
What this could lead to
If effective, PEMF could offer a drug-free, non-invasive way to speed up hamstring recovery after ACL surgery, potentially reducing muscle weakness and improving knee stability.
What could go wrong
This is an early-stage trial with a small number of participants, so results may not apply broadly. The therapy's benefit over placebo is unproven, and individual outcomes may vary.

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

About 60 people

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

Started

Jun 2024

Expected to finish

Mar 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: 1. Male and female with age ≥ 18 years at the time of surgery 2. First ACLR with HT autograft 3. Both knees without a history of injury/prior surgery 4. LSI for hamstring strength \<85% of contralateral leg at 4-month isokinetic assessment (70) 5. Voluntarily agreed to participate and signed the informed consent form Exclusion Criteria: 1. Any concomitant bone fracture, major meniscus injury or full-thickness chondral injuries requiring altered rehabilitation program post-op 2. Preoperative radiographic signs of arthritis 3. Other associated injuries (fractures and other ligament involvement such as neurovascular bundles injury) 4. Patient with a pacemaker, an implantable defibrillator, neurosurgical clips, a neurostimulator, cochlear implant, a stent, an insulin pump 5. Pregnant or breastfeeding 6. Inability to give informed consent

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As listed by the trial registrant

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

Anterior cruciate ligament reconstruction Hamstring muscle

How to take part

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

  1. The places running it

    1 site. 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

  • Prince of Wales Hospital

    RECRUITING

    Shatin, Hong Kong

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