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Can't fully straighten your knee after ACL surgery? it may slow your strength recovery

NCT ID NCT06863610

Knowledge-focused Sponsor: Hacettepe University 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 26, 2026 · Last updated Sep 17, 2026 · Updated 2 times

Summary

This study looks at 30 people who had ACL reconstruction surgery to see if having a knee extension deficit (not being able to fully straighten the knee) in the early weeks after surgery affects how well their thigh muscles recover strength. Participants are divided into two groups: those with more than 5 degrees of extension loss and those with less. Researchers will measure muscle strength and functional tests like jumping and balancing to find out if the deficit matters.

What this could mean

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

What this could lead to
If successful, this study could help physical therapists design better rehab programs for ACL patients by showing how much knee extension loss matters.
What could go wrong
This is a small observational study with only 30 participants, so results may not apply to everyone. It measures recovery but does not test a new treatment.

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

30 people

The number who actually took part.

Started

Mar 2025

Finished

Sep 2026

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 to 45 years

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 who underwent ACL repair using hamstring tendon autograft * volunteered to participate in the study between the ages of 18-45 * a non-contact injury mechanism * a Tegner Activity Score \>5 before the injury * regularly attended the rehabilitation program after surgery (not missing more than three sessions) Exclusion Criteria: * Patients who underwent ACL repair with patellar tendon autograft or allograft, revision surgery * underwent meniscus and or cartilage repair in addition to ACL repair * a history of previous knee, ankle, or groin injuries * concomitant systemic and/or neurological pathologies * a history of injury to the contralateral lower extremity * do not want to participate in the evaluations that should be done before the study.

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Conditions

The condition(s) this trial relates to.

Anterior Cruciate Ligament Injuries

As listed by the trial registrant

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

Anterior cruciate ligament injuries

Contacts and locations

Locations

  • Hacettepe University, Faculty of Physical Therapy and Rehabilitation

    Ankara, 06100, Turkey (Türkiye)

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