This is a prospective, randomized and double blinded study
All patients received :
* Pregabalin 150 mg preoperatively 12 h before the surgery.
* Single-shot spinal anesthesia with 10 to 12 mg of bupivacaine 0.5% and 2.5ug sufentanil patients were randomly allocated to receive:
* Group 1: IPACK + ACB single shoot
* Group 2: contineous ACB For group 1: IPACK was realized after spinal anesthesia with 40 ml ropivacaine 0.2% All patients received ACB in the immediate postoperative period with 20 ml ropivacaine 0.2%
Post operative analgesia included:
* Paracetamol 1g IV every 6 hours
* Diclofenac sodium (50mg) 1 tablet x 2 per day
* Pregabalin 150 mg given orally once daily for a period of 4 weeks.
* PCA morphine (Patient Controlled Analgesia), as a rescue analgesia,
* Continuous ACB catheter for 48H with :
4 ml per hour 0.2% ropivacaine in group 2 4 ml per hour saline in group 1
