After written informed consent, 120 ASA I and II patients scheduled for lower orthopedic surgery under epidural anesthesia were selected for this stuidy. Inclusion criteria: age between 18-65 years old; ASA I and II and scheduled for lower extremity orthopedic surgery. Exclusion criteria: Opioid adiction or abuse; lower extremity muscle weakness; hypersensitivity to opioids; patient refusal at any time during projetc and coagulopathy or anticoagulant therapy. Postoperative pain relief was performed by PCA (Patient Controlled Analgesia) as continous epidural analgesia and 5ml/h infusion rate. The patients were randomly allocated into two groups: 1- (R group) ropivacaine 0.3% plus fentanyl (2 mcg/ml) and 2- (B group) bupivacaine 0.2% plus fentanyl (2 mcg/ml). If the pain score (VAS) was more than 3, fentanyl 1mcg/kg iv was slowly administered. Pain assessed by Visual Analogue Score (0= no pain, 10= the worst imaginable pain) and Verbal Rating Scale (0= no pain, 1= mild, 2= moderate, and 4= sever pain). Motor blockade was assessed by Bromage scale (0= complete lower limb movement, 1= unable to hip flexion, 2= unable to knee flexion, and 3= unable to ankle flexion). Nausa and vomiting assessed as 1) no nausa and vomiting, 2) mild nausa without need to medication, 3) nausa need to medication, 4) unresponce to single dose of anti-emetic drug. Patient satisfaction evaluated by: 1) excellent, 2) good, 3) fair, and 4) dissatisfied. Also, presence or abscence of itching and urinary retention were recorded. All above data were recorded at immediate before pump filling, 6, 12, 24, 36 and 48 hours later. Collected data were analyzed.