Calf Strain
A calf strain is a tear within the calf muscle complex — most commonly the gastrocnemius (the two-headed muscle at the back of the lower leg), but also the soleus or the plantaris tendon. It’s a frequent injury in running, racquet sports, AFL and basketball.
The classic presentation is a sudden sharp pain in the back of the lower leg during a sprint, jump or change of direction — sometimes described as feeling like being hit by a ball or stick.
Muscle Anatomy
- Gastrocnemius: The larger, more superficial calf muscle. Crosses both the knee and ankle — prone to tearing during explosive movements
- Soleus: The deeper muscle. More common in runners and older athletes; presents as a slower-onset, deeper ache
- Plantaris: A thin, long muscle whose tendon can rupture — presents similarly to gastrocnemius but usually less severe
Grading
- Grade 1 (mild): Microtear, some pain but can continue activity; 1–2 weeks recovery
- Grade 2 (moderate): Partial tear, significant pain and bruising; 3–6 weeks recovery
- Grade 3 (severe): Complete rupture, inability to weight-bear; weeks to months, possible surgical review
Symptoms
- Sudden sharp pain in the calf at the time of injury
- Bruising and swelling appearing within 24–48 hours
- Tenderness on palpation of the muscle belly
- Weakness or inability to rise onto the toes
- Stiffness and pain walking
Treatment
Acute Phase (Days 1–3)
- PEACE & LOVE principles: Protection, Elevation, Avoid anti-inflammatories initially, Compression, Education; Load, Optimism, Vascularisation, Exercise
- Ice for comfort
- Gentle weight-bearing as tolerated — crutches if needed for grade 2–3
Rehabilitation
- Progressive range of motion and calf loading starting with isometrics, progressing to concentric and then eccentric work
- Scar tissue mobilisation in the sub-acute phase
- Proprioception and balance training
Return to Sport
We use objective criteria (strength symmetry, hopping tests) to guide return to running and sport — and structured running reintroduction. Most recurrences happen when athletes return too early.
Prevention
Recurrence is common, especially in the first 6–12 months after a significant strain. A calf strengthening and progressive return to sport program dramatically reduces the risk.
