Classification of pediatric fracture patterns seen at the base of the thumb metacarpal

Classification of pediatric fracture patterns seen at the base of the thumb metacarpal.
(A) Shaft fracture.
(B) Salter-Harris type II fracture with a medial "metaphyseal flag".
(C) Salter-Harris type II fracture with a lateral "metaphyseal flag".
(D) Salter-Harris type III fracture (pediatric Bennett's fracture).