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Hidden weakness after tennis leg: scar tissue may be the culprit

NCT ID NCT07513779

Knowledge-focused Sponsor: Al Hayah University In Cairo Source: ClinicalTrials.gov ↗

What the study statuses mean

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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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 24, 2026 · Last updated Jun 27, 2026 · Updated 1 time

Summary

This study looks at people who have recovered from tennis leg, a common calf muscle injury. Even after healing, many still have hidden weakness in their calf. Researchers use ultrasound to measure scar tissue thickness and a strength-testing machine to check muscle power. By comparing the injured leg to the healthy one, they hope to understand how scar tissue relates to ongoing weakness, which could improve rehab and return-to-sport decisions.

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 doctors better predict recovery and design more effective rehab programs for tennis leg patients.
What could go wrong
This is a small, observational study with only 40 participants and no treatment. Results may not apply to all patients or lead to immediate changes in care.

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 40 people

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

Expected to start

Apr 2026

An estimate. Start dates often move.

Expected to finish

Aug 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

Patients referred from orthopedic clinics to physiotherapy clinics and/or sports rehabilitation centers in Cairo, Egypt, who have a history of unilateral medial gastrocnemius muscle tear (tennis leg) confirmed by diagnostic ultrasound, have completed acute healing (≥3 months post-injury), and have returned to daily activities.

Ages

18 to 40 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: * Age between 18 and 40 years * History of unilateral plantar flexor muscle tear (tennis leg) involving the medial gastrocnemius, confirmed by diagnostic ultrasound * Ultrasound diagnostic criteria: hypoechoic or anechoic fluid collection between the medial gastrocnemius and soleus muscles, with partial or complete disruption of the normal muscle fiber architecture at the myotendinous junction * Grade I (mild strain, \<10% fiber involvement) or Grade II (moderate partial tear, 10-90% fiber involvement) injury * At least 3 months post-injury * Clinically healed with return to daily activities * Ability to perform maximal eccentric plantar flexion as assessed by the Eccentric Heel Raise Test (Single-Leg) (Chen et al., 2009) Exclusion Criteria: * Bilateral calf injuries * Grade III (severe/complete) gastrocnemius muscle rupture * Previous Achilles tendon rupture or surgery * Previous injuries or surgeries to the lower extremity (other than the index tennis leg injury) * Neurological disorders affecting lower limb function * Current acute pain or re-injury at the time of assessment * Other lower-limb musculoskeletal injuries affecting performance * Systemic inflammatory or connective tissue diseases * Popliteal cyst rupture * Deep vein thrombosis * Isolated Achilles tendon rupture * Muscle tumor

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As listed by the trial registrant

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

Muscle contusion Tennis leg

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

  • Outpatient clinic of faculty of physical therapy, Alhayah University in Cairo

    RECRUITING

    New Cairo, Cairo Governorate, 12345, Egypt