Abstract
A 76-year-old female developed left superior cluneal nerve disorder (SCN-D). She could not sit for even a short time because of a sharp low-back pain. Trigger-point injection around the left iliac crest was effective in the short term. Ultrasonography findings revealed an enlarged SCN and edematous thoracolumbar fascia where SCN penetrated. Pulsed radiofrequency therapy was tried with ultrasound peripheral nerve block technique. She got the pain relief and was able to sit comfortably when desired for more than one month.