Little League shoulder, formally called proximal humeral epiphysiolysis, is a stress injury of the growth plate at the upper end of the humerus in skeletally immature throwing athletes. It is a pediatric condition that does not occur in adults, because adults do not have open growth plates. Recognition matters because continued throwing can worsen the injury and rarely produce growth disturbance.
What Is Little League Shoulder?
The proximal humeral growth plate (physis) is the cartilaginous plate where new bone is formed during growth. In skeletally immature throwers, typically ages 11 to 15, repetitive high-velocity throwing generates rotational and traction forces that stress this growth plate. Over weeks to months of repetitive loading, the growth plate can become inflamed, widened, and painful. The condition is analogous to Little League elbow, which affects a different growth plate in the elbow.
The condition is reversible with rest and does not cause permanent damage in most cases. Untreated continued throwing can produce widening that takes longer to resolve and, in rare cases, can cause growth disturbance.
Causes and Risk Factors
- Age 11 to 15 with open proximal humeral growth plates
- High pitch counts or year-round throwing without rest periods
- Throwing breaking pitches at young ages, which increases rotational stress on the shoulder
- Poor throwing mechanics
- Inadequate rest between outings
- Participation on multiple teams concurrently
Symptoms
- Gradual onset of shoulder pain with throwing
- Pain initially only during high-effort throwing, progressing to pain with routine throwing and catch
- Loss of velocity
- Tenderness over the upper humerus
- Pain reproduced by resisted external rotation in the cocking position
- Usually no pain at rest or with other activities in early stages
Diagnosis
Dr. Chudik’s evaluation includes the throwing history, pitch volume, and pattern of symptom onset. Physical examination localizes tenderness to the proximal humerus and reproduces pain with throwing-position maneuvers. X-rays are often diagnostic, showing widening or irregularity of the proximal humeral growth plate compared to the opposite side. MRI is reserved for cases with atypical features or concerns about other pathology. The Westmont office has on-site high-field MRI and X-ray.
Treatment
Treatment is almost always non-surgical. The cornerstone is rest from throwing for six to 12 weeks. During this period:
- No throwing of any kind, including warm-up tosses
- A targeted physical therapy program for shoulder mechanics, scapular control, and core strengthening
- Evaluation of throwing mechanics with a coach or pitching specialist
- Progressive non-throwing conditioning
Once symptoms resolve and imaging shows recovery, a graduated return-to-throw program is started, beginning with short distances and low intensity and progressing over several weeks before full return to game situations.
Surgery is rarely indicated and only for cases with persistent pain despite a prolonged rest period or with an unusual finding on imaging.
Recovery and Outcomes
Recovery typically takes three to four months from the start of rest to full return to competitive throwing. Outcomes are excellent when the condition is recognized early and the rest period is respected. Athletes who cut the rest period short have high recurrence rates and may extend their total time away from the sport.
Preventing recurrence requires adherence to age-appropriate pitch counts, adequate rest days, and attention to throwing mechanics.
When to See Dr. Chudik
Schedule an evaluation if a young thrower has shoulder pain that has persisted beyond a throwing outing or two, or if velocity has dropped without clear injury. Call 630-324-0402 or request an appointment online.