What it is

Little League Shoulder is an irritation and stress injury of the growth plate at the top of the humerus. The growth plate is softer than adult bone. Repeated throwing or overhead hitting loads the plate before it is ready.

Pain increases with throwing and decreases with rest. The aim is to calm the plate and then rebuild strength, control, and a safer throwing pattern.

What happens when it occurs

The growth plate experiences traction and shear from rapid arm rotation and late cocking. Muscles are not yet strong enough to share the load. A measured rest period is followed by a graded return to the throw programme once strength and control are in place.

Common causes and risk factors

  • High throwing volumes and multiple teams in the same season
  • Rapid growth with relative calf and shoulder tightness
  • Limited trunk rotation and hip drive, which shifts the load to the shoulder
  • Previous shoulder or elbow pain in the same season

Who is most affected

Boys present more often than girls. The majority are affected in the dominant arm. Cricket fast bowlers, baseball and softball throwers, water polo players, and tennis servers feature in Australian clinics.

Typical symptoms

  • Dull ache at the top and outer side of the shoulder with throwing or serving
  • Loss of ball speed or accuracy
  • Tenderness over the growth plate and pain with resisted external rotation

When to seek care

Suppose pain appears during a season and does not settle within a week of rest. Seek urgent review if pain follows a single sharp event with marked weakness.

How we diagnose

History and examination with strength and control tests. X-rays can show growth plate changes when symptoms persist. Ultrasound helps in some cases. MRI is seldom required.

Management

  • A period away from throwing and heavy overhead work
  • Strength for the rotator cuff, scapular stabilisers, trunk, and hips
  • Mobility for the thoracic spine and posterior shoulder
  • Interval return to throw programme with technique coaching and season planning
  • Communication between family, coach, and clinician

Rehabilitation milestones

Phase 1 weeks 0 to 3: pain control, no throwing, gentle range and isometrics.

Phase 2 weeks 3 to 8: heavy slow strength for cuff and scapula, trunk and hip power, conditioning without throwing.

Phase 3 weeks 8 to 12: begin interval throwing at low volume, progress distance and intensity according to plan.

Phase 4 months 3 to 6: position-specific skills and competition readiness.

Readiness to progress

  • No pain with daily tasks and drills
  • External rotation and abduction strength within 90 per cent
  • Throwing steps completed without next-day soreness

Prevention

  • Plan season volumes with rest days and deload weeks
  • Build trunk and hip contribution to reduce shoulder load
  • Avoid overlapping team commitments during busy terms

Australia snapshot

  • Seen in cricket, baseball, water polo, and tennis programmes
  • Dominant arm involvement is the rule
  • Boys are present more often in Australian youth sport clinics

Latest insights

Rest the plate early, then strengthen the engine around it. Throwing returns smoothly when the lower body and trunk drive the motion.

Clear season plans reduce recurrence and protect the enjoyment of sport.

Frequently Asked Questions

Often, six to eight weeks of no throwing, followed by a graded return. Timelines vary with symptoms and control.

Yes, with running, cycling, and lower body and trunk strength. Avoid pain-provoking overhead work.

An X-ray is used when symptoms persist or the diagnosis is uncertain.

Recovery is expected with timely management. Ongoing pain needs review.

Yes, if you complete the interval programme without symptoms and pass testing.

Whole body warm up, shoulder activation, and a deliberate throwing build-up.