2.5. USG guided Blocks:
All blocks were made by the same practitioner (SGK). The patients were placed in the supine position, the knees were slightly flexed on the side of surgery. A high frequency linear ultrasound transducer was placed on the medial surface in the midline of the thigh in the transverse plane. By moving the transducer in the transverse plane, the femoral artery was detected in the adductor canal. The saphenous nerve located just lateral to the femoral artery was determined, a 22-gauge stimuplex needle was advanced from the lateral to medial direction using the in-plane technique, and 15 ml of bupivacaine (0.16% or 0.25%) was applied to encircle the saphenous nerve.