The stimulating needle group was significantly noninferior to the stimulating catheter group ( difference -LSB- @ % CI -RSB- in mean verbal response scale pain score -LSB- stimulating needle vs. stimulating catheter -RSB- of -@ -LSB- -@ to @ -RSB- , P < @ ; percentage difference in mean IV morphine equivalent dose of -@ % -LSB- -@ to @ % -RSB- , P = @ ) and to ultrasound-only group ( difference in mean verbal response scale pain score of -@ -LSB- -@ to @ -RSB- , P < @ ; percentage difference in mean IV morphine equivalent dose of -@ % -LSB- -@ to @ % -RSB- , P = @ ) .