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24 sensors map muscle oxygen after ACL surgery

NCT ID NCT06621355

Knowledge-focused Sponsor: Universitat de Lleida Source: ClinicalTrials.gov ↗

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Registered, but not yet taking participants.
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The trial has finished. Results may not be published yet.
Stopped early
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Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

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Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

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Status unknown
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First seen Sep 10, 2026 · Last updated Sep 11, 2026 · Updated 1 time

Summary

Researchers want to know whether muscle oxygen use changes after anterior cruciate ligament (ACL) reconstruction and whether those changes last. They will compare three groups of physically active men: those less than 6 months after surgery, those more than 2 years after surgery, and healthy controls with no ACL injury. All participants ride a single incremental interval test on a cycle ergometer while 24 near-infrared spectroscopy devices measure oxygen levels in their muscles.

What this could mean

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

Active substance
an incremental interval cycling test with muscle oxygen monitoring
What this could lead to
If the approach works, it could give doctors a non-invasive way to track muscle recovery after ACL surgery and tailor rehabilitation. It may also reveal whether blood-flow changes persist years after injury.
What could go wrong
This is an observational study, so it cannot prove that any rehabilitation approach works better than another. It only includes men aged 18 to 65, so the results may not apply to women, older adults, or people with other health conditions.

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.

Participants

About 129 people

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

Expected to start

Oct 2026

An estimate. Start dates often move.

Expected to finish

Dec 2026

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.

Who is studied

Participants are recruited from four collaborating centres in Mallorca: Espai Físic de Salut Integral, Fisioplanet, Hospital Universitari Son Espases (HUSE), and Sant Joan de Déu Palma-Inca (SJD), coordinated by the Universitat de Lleida (UdL). The sample is a non-probability convenience sample of men aged 18 to 65 years, allocated to three groups. LCA1: recent post-surgical ACL reconstruction, up to 6 months since surgery, referred by the physiotherapist or rehabilitation physician responsible for their recovery. LCA2: long-term post-surgical ACL reconstruction, at least 2 years since surgery, currently physically active, identified retrospectively from clinical databases at the collaborating centres. CON: healthy controls with no history of ACL or meniscal injury, recruited among people attending the collaborating centres for general fitness training, who are also regularly physically active.

Ages

18 to 65 years

Sex

Male participants only

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.

General inclusion criteria * Men aged 18 to 65 years. * Adipose tissue thickness of less than 2 cm at the NIRS device placement sites, assessed with a skinfold calliper. * Functional capacity to complete an incremental interval test on a cycle ergometer. * Able to understand and communicate, both orally and in writing, in Spanish, Catalan or English. General exclusion criteria * Cardiometabolic, endocrine, neurological, or other severe comorbidity that could compromise participant safety, alter physical performance, or interfere with the interpretation of the results. * Disabling pain preventing completion of the physical assessment as established in the protocol. Eligibility criteria (LCA1 group) * Physically active before the injury, with an exercise frequency greater than 3 days per week. * Surgically treated with ACL reconstruction. * Time since surgery of 6 months or less. * Explicit authorisation from the physiotherapist or rehabilitation physician responsible for their recovery, confirming that the participant is able to safely tolerate the physical demands of the test. Eligibility criteria (LCA2 group) * History of ACL reconstruction surgery, with a minimum of 2 years since the intervention. * Regular physical exercise practice (more than 3 days per week) during at least the 2 to 3 months prior to assessment. Eligibility criteria (CON group) * Regular physical exercise practice (more than 3 days per week) during at least the 2 to 3 months prior to assessment. * No history of ACL injury or meniscal injury in either knee.

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Conditions

The condition(s) this trial relates to.

Anterior Cruciate Ligament Injuries Motor Activity

As listed by the trial registrant

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

Acl injury Anterior cruciate ligament reconstruction Exercise Hemodynamics Oxygen consumption based assessment of hemodynamics

How to take part

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  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

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Contacts and locations

Locations

  • Espai Físic de Salut Integral (Sant Agustí)

    Palma de Mallorca, Balearic Islands, 07015, Spain

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