Tennis leg is a strain of one of the calf muscles — the medial head of the gastrocnemius. A calf muscle tear happens when the muscle is pushed to its limit and tears. So how do we diagnose tennis leg, and what do we do about it?
Tennis leg is one of two calf muscle tears — the other is a soleus strain.
Anatomy of the calf muscles
The calf muscles are the medial and lateral heads of the gastrocnemius and the deeper soleus. They join to form the Achilles tendon at the midpoint of the calf. We use them for walking and running, though the gastrocnemius matters more for faster running, such as sprinting.
What causes tennis leg?
Tennis leg usually happens during running or sports. A sudden change of direction, or a slip, overstretches the muscle and tears it. This tearing most often occurs when the ankle bends while the knee is straightened. Although common in sport, we also see it in overweight, deconditioned men in their forties.
Symptoms of a medial gastrocnemius tear
People usually report:
- Sudden pain during running or sports
- An inability to continue
- Limping from pain on the inside of the calf
- A pop or crack in the calf
Symptoms depend on severity. A minor tear may cause only tightness, with no swelling or limp. A larger tear causes obvious calf pain, swelling, and a limp.
How do we diagnose tennis leg?
Diagnosis rests on the history, but examination matters too. We often see swelling from the calf to the foot, tenderness along the calf, and sometimes a palpable defect at the site of the tear. We watch you walk to assess calf function. It’s also essential to exclude conditions that mimic a calf tear — a DVT (blood clot) or an Achilles tendon tear. We usually confirm the diagnosis with imaging.
Ultrasound of the calf
Ultrasound is good at detecting tennis leg tears, and it helps grade the tear and guide treatment.
A study by Dr Masci found the location of the tear matters more than the size. It grades tears 1 to 4 by site:
- Grade 1 (muscle only) — very fast return, often a few weeks
- Grade 2a/2b (involving the connective tissue between gastrocnemius and soleus) — longer, around 4–6 weeks
- Grades 3 and 4 (extending into the Achilles tendon) — the worst outlook, up to 3 months
So, ultrasound is essential for accurate diagnosis and management of gastrocnemius tears.
How does the site of the calf strain affect healing?
This study, co-authored by Dr Masci, found that tears in the calf muscle heal more quickly and require less time away from sport. However, tears of the aponeurosis mean that the injury will last longer. Finally, the worst outcomes occur if the tear extends into the Achilles tendon. Also, recovery is longer if the tear is more extensive, meaning the muscles stop working together properly. The recovery time between tears can differ by up to 2 months.
What does this mean for the management of tennis leg?
This study shows that an ultrasound scan can help doctors decide how long it will take to return to sport. An ultrasound is a quick and easy test that can be done in a doctor’s room simultaneously as an assessment.
Treatment of tennis leg
Recovery is quick for minor tears (grades 1 and 2a). Initially, use heel raises in your shoes, ice, and a calf bandage for three days, and avoid massage and heat early on. As the tear settles, start calf-strengthening exercises to help it heal. Once strength is back to normal, your therapist progresses you into sport-specific training, alongside balance and stability work.
Larger tears (grades 2b, 3, and 4) may need a walking boot for a short period. We base that on the size and location of the tear, and on whether the muscle moves correctly on ultrasound.
Draining the swelling (calf haematoma)
If the tear is extensive and involves connective tissue, a blood swelling — a haematoma — can collect between the muscles. A haematoma prolongs recovery, taking months to dissolve and scar, and significant scarring raises the risk of further tears.
We generally drain the haematoma to speed recovery, which is straightforward under ultrasound. Afterwards, we ice the calf, use a compression sock to prevent recurrence, and rescan in 1–2 weeks to check whether the swelling has returned and requires draining again.
Frequently asked questions about tennis leg.
How do I prevent tennis leg?
Tennis leg tends to affect older, deconditioned people, so staying fit and keeping the calf strong is the best prevention.
How long does tennis leg take to heal?
Severity and location decide the timeline. Grade 1 tears take a few weeks; grades 3 and 4take up to 3 months. An ultrasound assesses the tear’s site, which strongly affects healing.
Can I swim with a calf muscle tear?
Yes — swimming without kicking is an excellent way to stay active early on, when walking, running, or cycling is difficult. Use a pool buoy.
What else causes calf pain in runners and sportspeople?
Calf pain isn’t always a gastrocnemius tear. Other causes include a soleus muscle tear, an Achilles tendon tear, a tibial or fibular stress fracture, a pinched nerve in the calf, and a DVT (about 10% of calf injuries develop a clot — consider it with increasing pain or swelling).
How is a tennis leg different from a soleus tear?
Tennis leg (gastrocnemius) strikes suddenly during explosive movement and usually stops you in your tracks. A soleus tear comes on gradually, often as tightness or cramping, and you can sometimes keep going at first. Ultrasound is better suited to gastrocnemius tears; MRI is better for the soleus.
Final word from Sport Doctor London about tennis leg
Tennis leg is a common cause of acute calf pain from a gastrocnemius tear. Ultrasound is excellent for defining the tear’s severity and location, which guides treatment and return to sport.
To book a one-stop calf assessment and ultrasound with Dr Masci in London, contact the team here or call +44 (0) 203 488 0350.
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