Osteonecrosis after open reduction and internal fixation of a bicolumnar fracture of the distal humerus: a report of four cases.

Four cases with osteonecrosis of the trochlea after open reduction and internal fixation of a fracture involving both the medial and lateral columns of the distal humerus above the base of the olecranon fossa (a bicolumnar fracture of the distal humerus) are reported to bring attention to this complication.