Surgical procedure at the distal epiphysis of the humerus: The skin incision is performed directly above the lateral epicondyle of the humerus (Fig. 4a). Then the proximal part of the Lig. collaterale laterale is incised with a scalpel following the direction of the fibres. The forceps tip is on the dorsal and prominent rim of a groove that gives origin to this ligament (Fig. 4b). The drill hole is situated directly in the centre of the groove between the fibres of the lateral collateral ligament (Fig. 4c).