Type 0: no comminution or a small butterfly fragment less than 25 % of the bone.

Type I: small butterfly fragment less than 25 % of the bone.

Type II: butterfly fragment 50 % or less of the width of the bone

Type III: comminuted with a large butterfly fragment greater than 50 % of the width

Type IV: Severe comminution of an entire segment of bone (segmental comminution)