Site	Possible diagnoses
Lateral	Avascular necrosis of the capitellum (Panner’s disease; in children seven to 12 years of age)
	Osteochondritis dissecans (in children 12 to 16 years of age)
Medial	Flexor/pronator strain
	Medial apophysitis (little leaguer’s elbow, in children nine to 12 years of age)
	Medial collateral ligament injury
	Medial epicondyle avulsion
	Ulnar neuritis
Posterior	Olecranon apophysitis
	Olecranon (posterior) impingement
	Olecranon osteochondrosis
	Triceps/olecranon tip avulsion
Other	Fracture
	Loose cartilaginous bodies
	Synovitis