What it is

A corked thigh is a muscle contusion, most often in the quadriceps, from a direct blow.

Myositis ossificans is a complication where bone forms within the bruised muscle after a severe contusion or inadequate early management.

What happens when it occurs

Bleeding and inflammation lead to pain and stiffness. Excessive early loading may promote myositis ossificans in severe cases.

Common causes and risk factors

  • Contact in football codes and collisions in court sports
  • Insufficient compression and protection after the injury
  • Returning to impact too soon

Who is most affected

Field and court athletes in contact roles.

Typical symptoms

  • Bruising and swelling in the thigh
  • Pain on knee flexion and during running
  • A firm mass weeks after injury suggests myositis ossificans

When to seek care

If knee flexion remains limited beyond one week, if swelling is severe, or if a firm lump develops.

How we diagnose

Clinical assessment and range measurement. Ultrasound can assess haematoma. X-rays detect myositis ossificans after several weeks.

Management

  • Immediate compression and knee flexion positioning in the first 24 to 48 hours for severe contusions
  • Gradual range and strength, avoiding early deep massage or aggressive stretching
  • Return to impact when strength and range are restored

Rehabilitation milestones

Phase 1 days 0 to 3: compression, protected range, knee flexion positioning for severe bruises.

Phase 2 days 3 to 10: restore range, gentle strength, bike as tolerated.

Phase 3 weeks 2 to 4: running, acceleration, deceleration, sport drills.

Phase 4 weeks 4 to 6: contact progressions.

Readiness to progress

  • Full knee flexion equal to the other side
  • Quadriceps strength within 90 percent
  • Sprint and change of direction without pain

Prevention

  • Use compression and padding in contact roles
  • Respect early protection windows after severe contusions

Australia snapshot

  • Common in rugby league, rugby union, and Australian rules football
  • Myositis ossificans is uncommon but follows severe contusions without early protection
  • Compression and staged return reduce complications

Latest insights

Early compression and controlled range reduce risk of myositis ossificans.

Avoid deep massage in the first week for severe contusions.

Frequently Asked Questions

Simple contusions improve in 1 to 2 weeks. Severe contusions may take 3 to 6 weeks. Myositis ossificans, when present, extends timelines.

Gentle range is helpful, but avoid deep massage and aggressive stretching in the first week after a severe contusion.

Not usually. Ultrasound can assess a large haematoma. X-rays show myositis ossificans after a few weeks if a firm mass develops.

When knee flexion is full, strength is within 90 percent, and you can sprint and change direction without pain.

Firm early compression and protection from impact, then a graded return.

Usually possible with activity modification. Avoid kneeling on the bruised area.

Yes, use pain as a guide and avoid impact until range and strength are restored.