Disclaimer: This article is for general educational purposes only and does not constitute medical advice. Always consult a qualified health professional for advice specific to your condition. © 2026 Better Physiotherapy Bundoora.
A calf strain — the sudden "pop" or sharp pain in the back of the lower leg during a sprint or push-off — is one of the most common muscle injuries in runners and field athletes. With proper physiotherapy, most calf strains recover faster than expected, and full strength can be restored to prevent recurrence.
The Calf Muscle Complex
The calf consists primarily of two muscles: the gastrocnemius (the large, superficial two-headed muscle that gives the calf its shape) and the soleus (the deeper, flatter muscle beneath). Both insert into the Achilles tendon. The gastrocnemius crosses the knee as well as the ankle, making it particularly vulnerable to strain when the knee is extended during ankle plantarflexion — as in pushing off to sprint.
Grading and Initial Management
- Grade 1: Minor tear affecting less than 10% of muscle fibres. Mild pain, minimal swelling, and almost full function. PEACE & LOVE protocol (Protect, Elevate, Avoid anti-inflammatories, Compress, Educate, Load, Optimism, Vascularisation, Exercise).
- Grade 2: Partial tear with visible bruising and swelling, clear pain on palpation, reduced strength and function. Heel raise inserts reduce load through the repair. Graduated loading from 3–5 days post-injury.
- Grade 3: Complete muscle rupture. Imaging (ultrasound) required to confirm. Most cases managed conservatively; surgical repair occasionally considered for high-level athletes.
Physiotherapy Rehabilitation
Calf rehabilitation progresses through four phases:
- Phase 1 (Weeks 0–2): Reduce pain and swelling, gentle range-of-movement exercises, bilateral heel raises
- Phase 2 (Weeks 2–4): Single-leg heel raises, progression to step heel raises, walking normalisation
- Phase 3 (Weeks 3–6): Running on flat surface, progressive speed and distance, agility work
- Phase 4 (Weeks 4–8): Plyometric loading, sport-specific movements, return-to-training criteria testing
When to See a Doctor
A sudden calf injury should be assessed by a physiotherapist or GP to rule out deep vein thrombosis (DVT) and Achilles tendon rupture — both of which can present similarly to a calf muscle tear but require very different management. If you cannot weight-bear, have significant swelling, or are in doubt, seek same-day assessment.
Calf Strain Treatment at Better Physiotherapy Bundoora
We see calf strains frequently in our Bundoora clinic, particularly in runners and AFL players during the season. Our structured rehab programs return athletes to sport safely and with confidence. Call (03) 9467 6900 or book online.
Frequently Asked Questions
What is the difference between a gastrocnemius and soleus tear?
Gastrocnemius tears (most common) occur at the musculotendinous junction of the medial head and typically happen during a sudden push-off or sprint. Soleus tears are deeper and slower to diagnose — they present as aching deep calf pain during sustained running rather than a sudden "pop." Soleus tears generally take longer to recover and benefit from different exercise progressions.
Should I stretch a calf strain?
No — not in the acute phase. Stretching a recently torn muscle risks extending the tear and slowing healing. Gentle calf raises on a step (without stretching below neutral) are a safer early exercise. A physiotherapist will guide you on when and how to reintroduce calf stretching.
What is "tennis leg"?
Tennis leg is an informal term for a medial gastrocnemius muscle tear — the classic calf strain. The name comes from its frequency in tennis, where the sudden lunge-and-push-off action is the classic mechanism. Despite the name, it is equally common in runners, AFL players, and recreational athletes.
How do I prevent calf strains?
Key prevention strategies include: progressive calf strengthening with single-leg heel raises (building to 25+ per set), adequate warm-up before sprinting, managing training load increases (no more than 10% volume increase per week), and maintaining Achilles tendon flexibility. Calf strains are more common in athletes who are deconditioned or returning from a break.
Ashley Haleel
Physiotherapist & Owner — Better Physiotherapy Bundoora