Little League Shoulder Treatment
Little League shoulder — clinically known as proximal humeral epiphysiolysis — is a stress injury to the growth plate at the top of the humerus (upper arm bone) that occurs in skeletally immature athletes who perform repetitive overhead throwing motions. The growth plate, or physis, is the area of developing cartilage near the end of the bone where new bone growth occurs during childhood and adolescence — and because this cartilage is softer and more vulnerable to stress than mature bone, the repetitive rotational forces generated during throwing can cause the growth plate to become inflamed, widened, and in more severe cases partially separated from the surrounding bone. Little League shoulder is most common in baseball pitchers between the ages of 11 and 16 but can affect any young athlete involved in overhead sports, including swimming, tennis, volleyball, and javelin. Left untreated, continued throwing through the pain can lead to growth plate fracture and potentially affect normal bone development in the shoulder.
Dr. Jonathan Glashow is a board-certified orthopedic surgeon and Clinical Associate Professor of Orthopedic Surgery at NYU Grossman School of Medicine, with specialized training in pediatric orthopedics through a rotation at Harvard University’s Boston Children’s Hospital and a traveling shoulder fellowship under Dr. Charles Rockwood and Dr. Richard Hawkins. This combination of pediatric orthopedic training and advanced shoulder expertise is essential for Little League shoulder — a condition that requires understanding both the unique physiology of the growing skeleton and the biomechanics of the overhead throwing motion. Dr. Glashow provides sports medicine and orthopedic care for New York City public and private school students and serves as Chief Medical Officer for the New Jersey Devils and Philadelphia 76ers. Named a Castle Connolly Top Doctor every year since 2000, he evaluates and treats Little League shoulder at his Upper East Side practice in New York City.
Causes and Risk Factors
Little League shoulder develops from repetitive microtrauma to the proximal humeral growth plate during the throwing motion — particularly during the late cocking and acceleration phases, when the shoulder experiences extreme rotational forces. The condition is most commonly caused by throwing too many pitches, throwing too frequently without adequate rest between sessions, throwing breaking pitches (curveballs and sliders) at too young an age, and year-round participation in throwing sports without an off-season. Poor throwing mechanics that place additional rotational stress on the shoulder can accelerate the problem. Growth spurts during early adolescence increase vulnerability, because the growth plate widens and softens during periods of rapid bone growth.
Symptoms of Little League Shoulder
- Pain in the shoulder during or after throwing — particularly during the acceleration phase
- Gradual onset of shoulder soreness that worsens over weeks to months
- Decreased throwing velocity or accuracy
- Pain with overhead reaching or lifting
- Tenderness over the outer aspect of the upper arm near the shoulder
- Stiffness or reduced range of motion in the throwing shoulder compared to the non-throwing side
Diagnosis and Treatment
Dr. Glashow diagnoses Little League shoulder through a clinical examination that assesses shoulder range of motion, strength, and tenderness — followed by X-rays of both shoulders for comparison. The hallmark finding on X-ray is widening of the proximal humeral growth plate on the throwing side compared to the non-throwing side, which confirms the diagnosis. An MRI may be ordered in more severe or atypical cases to evaluate the extent of growth plate involvement and rule out other causes of shoulder pain.
The cornerstone of treatment is complete rest from throwing and overhead sports — the growth plate must be allowed to heal before any return to activity. The rest period typically lasts six to twelve weeks, depending on the severity of the injury and the findings on follow-up imaging. During the rest period, the athlete can maintain cardiovascular fitness and lower body conditioning, but all throwing and overhead activity must stop completely. Once the growth plate has healed — confirmed by clinical examination and follow-up X-rays — a structured return-to-throwing program is introduced gradually, with close attention to pitch counts, rest intervals, and throwing mechanics.
Surgery is rarely necessary for Little League shoulder. The condition is almost always self-limiting when rest is initiated early and the athlete follows the return-to-throwing protocol. However, continued throwing through the symptoms — which unfortunately happens when the injury is not properly diagnosed — can result in growth plate fracture or growth disturbance that may require more extensive intervention.
Little League Shoulder Treatment in New York City
If your child is involved in baseball or another overhead throwing sport and is experiencing shoulder pain during or after throwing, it is important to stop training and have the shoulder evaluated promptly — early diagnosis and rest produce the best outcomes and protect the growth plate from further damage. Dr. Glashow offers same-day evaluation with on-site X-rays at his Upper East Side practice. Contact our office to schedule your appointment.
Frequently Asked Questions About Little League Shoulder
What is Little League shoulder?
Little League shoulder is a stress injury to the growth plate at the top of the humerus — the upper arm bone — caused by repetitive overhead throwing in skeletally immature athletes. The growth plate is a layer of developing cartilage near the end of the bone that is softer than mature bone and vulnerable to repetitive rotational stress. When the forces generated by throwing exceed the growth plate’s tolerance — due to overuse, insufficient rest, or poor mechanics — the growth plate becomes inflamed and widened, producing pain that worsens with throwing activity.
What is the difference between Little League shoulder and Little League elbow?
Both are growth plate stress injuries caused by repetitive throwing in young athletes, but they affect different joints. Little League shoulder involves the proximal humeral growth plate at the top of the upper arm bone, producing pain in the shoulder during the acceleration phase of throwing. Little League elbow involves the growth plates on the inner or outer side of the elbow, producing pain in the elbow — particularly on the medial (inner) side — during the late cocking and acceleration phases. Both conditions are treated with rest and a structured return-to-throwing program, and both are preventable with proper pitch count management and adequate rest periods.
How long does my child need to stop throwing?
The rest period typically ranges from six to twelve weeks, depending on the severity of the growth plate injury. During this time, the athlete must completely avoid throwing and all overhead sports activities. Dr. Glashow monitors healing with clinical examination and follow-up X-rays before clearing the athlete to begin a gradual return-to-throwing program. Returning to throwing too early — before the growth plate has fully healed — significantly increases the risk of re-injury and potential growth disturbance.
Can my child still play other sports during recovery?
Yes — as long as the activity does not involve throwing or overhead arm movements. Running, cycling, lower body conditioning, and core strengthening are all typically permitted during the recovery period. Maintaining overall fitness helps the athlete return to their sport more quickly once the shoulder has healed. Dr. Glashow provides specific activity guidelines based on each patient’s injury severity.
Will Little League shoulder affect my child’s growth?
When diagnosed and treated early with appropriate rest, Little League shoulder almost always heals completely without any long-term impact on bone growth or shoulder development. The growth plate resumes its normal function once the inflammation resolves and the stress is removed. However, if the athlete continues to throw through the pain and the growth plate sustains a fracture or significant disruption, there is a risk of growth disturbance — which is why early evaluation and strict adherence to the rest period are so important.
How can Little League shoulder be prevented?
The most effective prevention strategies include following age-appropriate pitch count guidelines established by organizations like Little League International and USA Baseball, ensuring adequate rest between pitching appearances (minimum four days of rest after higher pitch counts), avoiding breaking pitches until the athlete’s skeleton is mature enough to tolerate the rotational forces (generally age 14 or older for curveballs), limiting year-round throwing by taking at least two to three months off from overhead sports each year, and emphasizing proper throwing mechanics through qualified coaching. Dr. Glashow can evaluate a young athlete’s shoulder health and provide individualized recommendations for safe training practices.
