The pattern of this injury is characterized by an epiphyseal separation (Salter-Harris I).
It occurs mainly in infants and very young children whose capitellum is still not ossified. Diagnosis can therefore be very difficult.
Note: Be aware of the possibility of nonaccidental injuries in younger children.
Radiologically this lesion is difficult to distinguish from elbow dislocation, especially if the capitellum is not ossified.
Ultrasonography, or arthrography, is helpful in reaching the correct diagnosis.
Young child (2-month-old):
Older child (older than 6 years):