This is a very superficial block that provides sensory anesthesia and analgesia to the lateral thigh. The lateral femoral cutaneous nerve (LCFN) is a terminal branch of the lumbar plexus and enters the leg overlying the sartorious muscle. It is most often found approximately 1-2cm medial and 1-2cm inferior to the ASIS. We have have several recent cases of patients with large abscesses of the thigh where they skin pop heroin that have been successfully drained with this block.
The set up