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Author: Erik Verzemnieks, MD Educational Pearls: Single study in Japan demonstrated possible effectiveness of renal colic trigger point Patients had injection at the area of maximal tenderness on palpation of the flank Compared to a muscle relaxer, injection of local anesthetic at the trigger point had faster time to pain relief and fewer rescue therapies References Iguchi, M et al. Randomized trial of trigger point injection for renal colic. International Journal of Urology . 2002. 9(9): 475-479