Clinical study of baseball pitchers: correlation of injury to the throwing arm with method of delivery

structures are subjected to traction, while compression occurs at the radial humeral joint. Separation or fragmentation of the medial humeral epicondyle may develop, with traumatic arthritis or osteochondritis dissecans laterally. In older pitchers osteochondritis of the olecranon (possibly a later manifestation of the same forces) may be due to bony hypertrophy, medial stress, and cubitus valgus. The incidence of shoulder disability appears to increase with age and proficiency. Osteochondritis of the proximal humeral epiphysis has been reported in children, while in older pitchers, tendonitis and muscle strain are more common The exact muscle