,With fluoroscopy, a 20 gauge 10-mm bent Teflon coated needle was gently guided into the groove between the SAP and the sacrum for the dorsal ramus of L5 and the lateral border of the posterior sacral foramen, for the lateral branches of S1, S2, and S3. 
,With fluoroscopy , a 20 gauge 10 - mm bent Teflon coated needle was gently guided into the groove between the SAP and the sacrum for the dorsal ramus of L5 and the lateral border of the posterior sacral foramen , for the lateral branches of S1 , S2 , and S3 .