Muscle injuries
Hamstring, calf, quadriceps, and adductor strains have well-studied recovery timelines, and the difference between a clean return to sport and a re-injury often comes down to grading the injury accurately and respecting the timeline.
Acute muscle injuries (hamstring, calf, quadriceps, adductor) have well-studied patterns of recovery. The difference between a clean return to sport and a re-injury usually comes down to grading the injury accurately, respecting the early healing window, and progressing through the rehabilitation milestones rather than the calendar weeks.
Common muscle problems we see
Common muscle injuries
Hamstring, calf, quadriceps and adductor strains.
Read more DiagnosisAssessment and grading
Getting the diagnosis and grade right to guide the timeline.
Read more RehabRehabilitation principles
Progressive loading that rebuilds strength and guards against re-injury.
Read more ReturnReturn to sport
Criteria-based progression back to training and competition.
Read more
Common muscle injuries
- Hamstring strain: sprinting and high-speed running injuries; biceps femoris is most commonly affected
- Calf strain: gastrocnemius (mid-calf) and soleus (deeper, often slower-onset) patterns
- Quadriceps strain: kicking and sprinting injuries; rectus femoris often involved
- Adductor strain: change-of-direction injuries; common in field-sport athletes
- Calf and hamstring tendon avulsions: uncommon but important to recognise
Assessment and grading
Specialist assessment grades the injury using clinical criteria (mechanism, location, range, strength) and imaging where useful. Ultrasound and MRI both have roles. The British Athletics Muscle Injury Classification (BAMIC) is commonly used, and the principle is consistent: more severe and more proximal injuries take longer to recover.
Imaging-based grading helps inform return-to-sport timelines, particularly for athletes whose calendar matters. It does not replace the clinical assessment.
Rehabilitation principles
Acute phase
Protection, optimal loading, ice, compression, elevation. Early gentle range and isometric work begins as pain allows.
Progressive loading
Strengthening through full range, including eccentric work that has been shown to reduce re-injury rates in hamstring strains.
Functional progression
Running, then sprinting, then sport-specific drills, with each step requiring strength, range, and pain criteria to be met.
Return to play
Full training load tolerated, sport-specific milestones cleared, then competition.
Return to sport
Re-injury rates are significantly higher in the first weeks after return to sport, particularly when athletes return based on time alone rather than meeting milestones. Specialist input adds the criteria-based assessment that reduces re-injury risk. See return to sport assessment.
Common questions
How long until I can run again?
Days to weeks depending on grade and location. Early light running often happens before sprinting return.
Should I have an MRI?
For elite or competitive athletes, MRI is often used to inform return-to-sport timing. For recreational athletes, clinical assessment alone is often sufficient.
Will I keep re-injuring it?
Re-injury risk is highest when rehabilitation is incomplete or return is rushed. Following a criteria-based progression can substantially reduce re-injury rates.
