What it is

Avulsion injuries of the medial epicondyle occur when a fragment of the growth area pulls away from the humerus, usually during a valgus force such as a throw, fall, or elbow dislocation. It is a growth‑plate‑specific fracture pattern in adolescents.

Management depends on displacement and stability. Many are treated without surgery; larger displacements or unstable elbows may need fixation.

What happens when it occurs

The flexor–pronator muscles and ulnar collateral ligament pull on the growth area. A sudden force can separate the fragment. Protecting the elbow allows healing; surgery restores alignment when stability is compromised.

Common causes and risk factors

  • Throwing with high valgus stress
  • Falls onto an outstretched hand
  • Elbow dislocation events

Who is most affected

Adolescents in throwing and contact sports. Dominant arms are commonly involved.

Typical symptoms

  • Inner elbow pain after a single event
  • Swelling, bruising, and reduced motion
  • Tenderness over the medial epicondyle

When to seek care

Immediately after an event with pain, swelling, or deformity. Early imaging guides management.

How we diagnose

Clinical examination and X‑rays with comparison views when needed. CT or MRI is used for planning in selected cases.

Management

  • Immobilisation or hinged bracing for protection
  • Gradual range and strength once pain allows
  • Return to throwing after the criteria are met
  • Surgical fixation is used when displacement is large or the elbow is unstable.

Rehabilitation milestones

Phase 1 weeks 0–3: protection, swelling control, hand and shoulder activity.

Phase 2 weeks 3–6: range restoration, light strength for the forearm and shoulder.

Phase 3 weeks 6–12: progressive strength, interval throwing when cleared.

Phase 4 months 3–6: sport‑specific volumes and contact readiness.

Readiness to progress

  • Pain-free range and daily tasks
  • Strength within 90 per cent
  • Throwing steps completed without next‑day symptoms

Prevention

  • Technique and workload planning for throwers
  • Protective skills for falls and contact sports
  • Avoid early return before strength and range targets are met

Australia snapshot

  • Seen in school sports and after falls
  • Most cases heal well with timely management
  • Surgical care is available in public and private centres when required

Latest insights

Growth plates are strong but different. Respect healing timelines before throwing resumes.

Fixation restores alignment when the fragment is displaced; rehab builds durable function.

Frequently Asked Questions

No. Many heal with protection and rehabilitation. Surgery is reserved for larger displacements or unstable elbows.

After range and strength targets are met, imaging shows stability. An interval plan guides volume of training loads, gradually building to full throwing volume, frequency, power and distance.

When managed well, most recover without growth problems. Follow‑up ensures alignment and comfort.