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Background:   To reduce the risk of radiation exposure, we explored whether the total dorsal ramus block can be performed under ultrasound guidance. We evaluated the accuracy and effect of ultrasound-guided total dorsal ramus block for chronic low back pain.Methods:   Accuracy of ultrasound guidance after total dorsal ramus block to the L4–L5 level was evaluated using fluoroscopy ( n = 5). A second group was assigned into two groups: ultrasound-guided group ( n = 19) or fluoroscopy-guided group ( n = 18). The effects and adverse events were compared.Results:   In all cases, the fluoroscopic findings revealed an accurate injection at the L5 level. Significant alleviation of pain was observed after ultrasound-guided total dorsal ramus block, and comparable effectiveness was observed with both ultrasound guidance and fluoroscopic guidance. There were no complications.Conclusions:   The ultrasound-guided total dorsal ramus block may sufficiently block all three branches of the lumbar dorsal ramus at the targeted level resulting in significant pain reduction.

Ultrasound-guided total dorsal ramus block for the treatment of chronic low back pain