Shoulder MRI Abnormalities in Asymptomatic Little League Baseball Players

Area of Science:

• Orthopedics
• Sports Medicine
• Radiology

Background:

• Youth baseball participation is high in the U.S.
• Associated with increased risk of shoulder pain and injury
• Incidence of shoulder abnormalities in young baseball players is not well-defined

Purpose of the Study:

• To evaluate magnetic resonance imaging (MRI) findings in the shoulders of asymptomatic Little League baseball players
• To correlate MRI abnormalities with throwing history and physical examination findings

Main Methods:

• Case-control study involving 23 baseball players aged 10-12 years
• Players underwent physical exams and completed questionnaires on playing history and pain
• Bilateral shoulder MRIs were performed and analyzed by blinded radiologists

Main Results:

• 52% of players had shoulder abnormalities on MRI, predominantly in the dominant arm
• Common abnormalities included proximal humeral physis widening, labral tears, and rotator cuff tears
• Year-round play and single-sport specialization were significant risk factors for MRI abnormalities (P < .05)

Conclusions:

• Shoulder abnormalities are prevalent in Little League baseball players, even in asymptomatic individuals
• Year-round play and single-sport focus are key risk factors
• Findings underscore the importance of monitoring and preventive measures for young athletes