Fig. 2.

Surgical release of the median nerve at the level of the lacertus fibrosus (lacertus tunnel syndrome). a A transverse incision is placed from just medial to the biceps tendon (BT) to just lateral to the medial epicondyle (ME). Following blunt dissection of the subcutaneous tissue, the pronator teres fascia is opened, and the muscle was retracted medially. b The lacertus fibrosus (LF) is carefully isolated (arrow) and divided in its entire length while the median nerve is kept under visual control. c With the pronator teres retracted medially, the median nerve (MN) is easily seen after division of the LF