Fig. 4

Thoracolumbar dorsal ramus nerve block for postoperative analgesia. Figure A shows the dorsal ramus nerve catheters prior to closure. On the left side, the approach is at L4, and the nerve block catheter is indwelled at the T8 position. On the right side, the approach is at L1, and the nerve block catheter is indwelled at the T12 position. Figure B shows the location for catheter placement