I. Five cases of dislocation of the head of the radius associated with fracture of the upper end of the ulna in children are reported. It is important that fractures of the upper end of the ulna, especially those with some varus deformity in children, should arouse suspicion of the possible co-existence of a dislocation of the head of the radius.

2. The association of the injury to the elbow with a fracture of the lower end of the radius and ulna in three of our cases indicates the necessity for keeping in mind the possibility of this combination.

3. Closed reduction seems to be the best method of treatment.

4. Our five cases were seen during a period ofonly three years. We therefore believe that this injury is not as unusual as appears from the literature.

1. A case of metaphysial dysplasia observed for eleven years is reported.

2. Only one case with similar features has previously been reported.

3. The literature on the subject is reviewed.