A new approach to lateral cutaneous nerve of thigh block

A new approach to the lateral cutaneous nerve of thigh is described. It depends on locating the depth of the canal through which the nerve passes immediately medial to the anterior superior iliac spine. Anatomical dissections show that it lies deep to the attachments of external oblique aponeurosis, the internal oblique muscle, and a deep fascial layer. Two district 'pops' or loss of resistance can be identified during insertion of a short-bevelled needle. Location of the canal by the technique described has been confirmed radiographically.