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5Nail insertion

Retrotorsion of the nail

In order to lock the nail in the correct trajectory, mount the aiming arm and swivel it approximately 25° anteriorly in order to follow the retroverted axis of the humeral head. (Due to the physiological retrotorsion of the humeral head, the axis of the humeral head is directed approximately 25° posteriorly to the condylar plane of the distal humerus.)

This is also important if a direct screw fixation of the lesser tuberosity is intended in order to prevent any injury of the biceps tendon.