1) Manchikanti L, et al : Effectiveness of protective measures in reducing risk of radiation exposure in inerventional pain management : a prospective evaluation. Pain Physician 6 : 301-305, 2002
2) Bach S, et al : Phantom limb pain in amputees during the first 12 months following limb amputation, after preoperative lumbar epidural blockade. Pain 33 : 297-301, 1988
3) Hanu-Cernat DE, et al : Type of inter ventional pain procedure, body weight, and presence of spinal pathology are determinants of the level of radiation exposure for fluoroscopically guided pain procedures. Pain Pract 12 : 434-439, 2012
4) Williams SR, et al : Ultrasound guidance execution and speeds improves the quality of supraclavicular block. Anesth Analg 97 : 1518-1523, 2003
8) Rauch S, et al : Ultrasound-guided lumbar medial branch block in obese patients : a fluoroscopically confirmed clinical feasibility study. Reg Anesth Pain Med 34 : 340-348, 2009
9) Galiano RA, et al : Ultrasound-guided versus computed tomography-controlled facet joint injections in the lumbar spine : a prospective randomized clinical trial. Reg Anesth Pain Med 32 : 317-322, 2007
10) Auroy Y, et al : Major complications of regional anesthesia in France : the SOS regional anesthesia hotline service. Anesthesiology 97 : 1274-1280, 2002
11) Fredrickson MJ, et al : Neurological complication analysis of 1000 ultrasound guided peripheral ner ve blocks for elective or thopedic surgery : a prospective study. Anaesthesia 64 : 836-844, 2009
12) Bar rington MJ, et al : Preliminary results of the Australasian Regional Anaesthesia Collaboration : a prospective audit of more than 7000 peripheral nerve and plexus blocks for neurologic and other complications. Reg Anesth Pain Med 34 : 534-541, 2009
13) Orebaugh SL, et al : Adverse outcomes associated with nerve stimulator-guided and ultrasound-guided peripheral nerve blocks by supervisd trainees : update of a singlesite database. Reg Anesth Pain Med 37 : 577-582, 2012
14) Shim JK, et al : Ultrasound-guided lumbar medial-branch block : a clinical study with fluoroscopy control. Reg Anesth Pain Med. 31 : 451-454, 2006