Inferior cluneal nerve entrapment syndrome (ICNES) is a rare and painful condition. Piriformis injections, piriformis release and caudal injections are used in the treatment. We report our successful application of sacral erector spinae plane block (ESPB) in a patient suffering from persistent ICNES. A 72-year-old female patient, who was on oral tramadol, gabapentin and paracetamol treatment due to thepain in her left inferomedial gluteal region for 4 years, was scheduled for sacral ESPB. High frequency linear transducer was placed on the fifth spinous process onthe transverse plane when the patient was in the prone position to visualise the intermediate sacral crest. 20 mL of local anesthetic was injected between the erector spinae muscles and intermediate sacral crest. The patient expressed relief of her pain after 5 minutes following sacral ESPB application. At the third week of post-intervention period, she no longer required oral medication.  Sacral ESPB may be a good option in the cases with entrapment syndrome of posterior sacral nerve
branches.

NEW INDICATION FOR NOVEL BLOCK: SACRAL ERECTOR SPINAE PLANE BLOCK FOR INFERIOR CLUNEAL/SACRAL NERVE ENTRAPMENT SYNDROME