The Tri-Cities has some of the best youth baseball culture in the state — and some of the most enthusiastic young arms on the mound. But those arms can only handle so many pitches before they start breaking down. Little League shoulder and Little League elbow are the most common overuse injuries in youth baseball, and they are far more serious than most parents realize. They involve the growth plates — and growth plates can't be pushed through the way a sore adult muscle can.
What Is Little League Shoulder?
Little League shoulder (proximal humeral epiphysiolysis) is a stress injury to the growth plate at the top of the upper arm bone. The growth plate is the weakest link in a young thrower’s shoulder — weaker than the muscles, tendons, and ligaments around it. Repetitive throwing forces the growth plate to widen, which causes pain and can lead to lasting damage if throwing continues.
It most often affects pitchers between ages 11 and 16 — the window when the shoulder is growing fastest. The growth plate closes in the late teens, after which the injury is no longer possible. But during those years, the shoulder is genuinely vulnerable.
What Is Little League Elbow?
Little League elbow is an umbrella term for several growth plate and stress injuries around the elbow in young throwers. The most common is medial apophysitis — inflammation at the medial epicondyle (the bony bump on the inner elbow) where the forearm muscles attach. More serious cases involve osteochondritis dissecans (OCD) of the capitellum — where a piece of cartilage and bone can fragment on the outer elbow.
Elbow injuries tend to be more complex than shoulder injuries. OCD lesions in particular can require surgery if the cartilage fragment becomes unstable or detached.
Warning Signs Every Parent Should Know
The key signs that should prompt a same-week evaluation:
- Pain on the outer or inner side of the elbow while throwing
- Shoulder pain that lingers after a game or practice
- Loss of velocity or accuracy that the athlete can't explain
- Locking, catching, or clicking in the elbow
- Decreased range of motion — especially inability to fully straighten the elbow
- Arm soreness that doesn’t clear within 24–48 hours of rest
Pain during throwing that makes an athlete alter their mechanics is especially concerning. Don’t assume it will go away between outings.
Diagnosis
Diagnosis starts with a clinical exam and X-rays. Growth plate widening is visible on plain X-rays in most cases of Little League shoulder. For elbow injuries, X-rays identify most medial epicondyle injuries and some OCD lesions. MRI is often needed to evaluate cartilage quality and determine whether an OCD lesion is stable or unstable — the distinction that drives treatment decisions.
Treatment
Rest is the foundation. Most Little League shoulder and elbow injuries resolve completely with a structured throwing break. The growth plate needs time to recover. For shoulder injuries, that typically means 4–6 weeks off throwing, followed by a formal return-to-throw program under supervision. For medial elbow injuries, the timeline is similar.
OCD lesions require more evaluation. A stable OCD lesion may respond to rest alone over several months. An unstable lesion — or one that has fragmented — typically requires arthroscopic surgery to remove the loose piece, treat the defect, or stabilize the cartilage. The sooner an unstable lesion is identified, the more treatment options are available and the better the outcome.
Mechanics and workload matter. A throwing break that ends without addressing the underlying cause is just a delay. Dr. Kelly partners with coaches and physical therapists to evaluate mechanics, recommend pitch count limits based on age and injury history, and help athletes return to throwing with better load management going forward.
Pitch Count and Prevention
USA Baseball and Little League Baseball have published age-specific pitch count limits that are well-grounded in the science of youth arm injuries. The key numbers for Eastern Washington families:
- Ages 7–8: max 50 pitches per day
- Ages 9–10: max 75 pitches per day
- Ages 11–12: max 85 pitches per day
- Ages 13–16: max 95 pitches per day
- Ages 17–18: max 105 pitches per day
Required rest days after pitching are equally important — not optional. Year-round baseball with no off-season is the clearest risk factor for serious arm injury in youth players. A structured 3-month break from overhead throwing each year is the best injury prevention tool available.
When to See Dr. Kelly
If your young athlete has arm pain that isn’t clearing with 2–3 days of rest, it’s worth getting evaluated. The earlier a growth plate injury is identified, the simpler the treatment. Waiting until pain is severe — or until a loose OCD fragment has separated completely — limits options and extends recovery.
Dr. Kelly grew up here. He played baseball, football, and soccer at Pasco High and knows what it means for a Tri-Cities kid to lose a season to injury. His goal is to get young athletes back on the field safely, with a plan that protects the next several years of their athletic career — not just the next game.
