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Which screw keeps the knee tunnel from widening after ACL surgery?

NCT ID NCT07830953

NEW Symptom relief Sponsor: Austrian Workers Compensation Board Styria 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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Sep 21, 2026 · Last updated Sep 21, 2026

Summary

Researchers compare three tibial interference screws used to fix the graft during ACL reconstruction: a PEEK screw, a biocomposite screw, and an allograft bone screw. Adults having primary ACL reconstruction with a quadriceps tendon graft are randomly assigned to one screw type. The trial measures tibial tunnel widening on CT scans 12 months after surgery and checks graft healing on MRI plus patient-reported knee scores. The goal is to learn which screw material best limits tunnel widening and supports graft integration.

What this could mean

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

Active substance
three types of tibial interference screws used to fix the ACL graft: a PEEK screw, a biocomposite screw, and an allograft bone screw
What this could lead to
If one screw type limits tunnel widening and helps the graft integrate better, surgeons could choose it to improve knee stability and recovery after ACL reconstruction.
What could go wrong
The trial is small, with 33 participants, and compares only three screw types in one surgical technique. Differences in tunnel widening or graft healing may be too small to detect, and results may not apply to other grafts or surgeons.

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 33 people

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

Expected to start

Nov 2026

An estimate. Start dates often move.

Expected to finish

Dec 2028

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 to 70 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: * Male and non-pregnant female patients aged 18-70 years * MRI-confirmed rupture of the anterior cruciate ligament (ACL) * Clinically positive anterior drawer test and Lachman test * Subjective instability * Clinically and MRI-confirmed intact posterior cruciate ligament (PCL), medial collateral ligament (MCL), and posterolateral corner * Written informed consent obtained * Patient is able and willing to participate in the study Exclusion Criteria: * Previous surgery on the affected knee joint (ACL reconstruction, fracture fixation, osteotomy, or partial joint replacement) * Body mass index (BMI) \> 40 * Coronal instability due to injury of the medial collateral ligament or posterolateral corner * Meniscal injury requiring postoperative restriction of weight-bearing (e.g., root tears, radial tears) * The patient is unable to speak German * The patient is pregnant

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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.

Acl - anterior cruciate ligament rupture

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

  • AUVA UKH Steiermark, Standort Graz

    Graz, Styria, 8044, Austria

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