,With fluoroscopy, a 25-gauge 3.5-inch spinal needle was gently guided into the groove between the SAP and sacrum through the dorsal ramus of the L5 and the lateral and superior border of the posterior sacral foramen with the lateral branches of S1, S2, and S3. 
,With fluoroscopy , a 25 - gauge 3.5 - inch spinal needle was gently guided into the groove between the SAP and sacrum through the dorsal ramus of the L5 and the lateral and superior border of the posterior sacral foramen with the lateral branches of S1 , S2 , and S3 .