Comparison of proximal versus distal approach for ultrasound-guided obturator nerve block for prevention of adductor spasm in patients undergoing transurethral resection of urinary bladder tumors

The success rate in terms of the absence of adductor spasm during surgery was higher in proximal than in distal ultrasound-guided ONB. However, the proximal technique requires more time to perform the block than the distal technique, as it is technically challenging and carries a risk of vascular puncture.