Fracture of the medial humeral condyle in children is an epiphyseal
injury, and it is probably caused by a valgus force incurred with the elbow
extended, the origin of the flexor muscles and medial collateral ligament
avulsing and rotating the condyle. The injury is uncommon and is easily
misdiagnosed. Four children who were treated within one week of injury were
seen more than one year later and had good results. Two patients who were
treated late and another who was not treated had poor results. Early
diagnosis, accurate reduction, and internal fixation are important to avoid
growth disturbance, articular incongruence, and functional disability.