Patients are placed in the supine position and a high-frequency linear probe is inserted for a cross-sectional image of the groin and thigh. The femoral nerve is identified in the short axis near the inguinal crease and the ultrasound transducer is placed caudally beyond the femoral triangle. The location of the proximal block is determined where the superficial femoral artery passes under the medial border of the sartorius muscle (usually 8-12 cm distal to the inguinal crease). Using the in-plane technique, a 100 mm peripheral nerve block needle is advanced until the tip of the needle passes the sartorius muscle and enters the adductor canal from the lateral side of the superficial femoral artery, and 20 mL 0.375% Bupivacaine is administered. To verify block success, sensory function is assessed by pinprick testing along the saphenous nerve distribution by comparing the pinprick sensation to the unaffected limb.

Patients are placed in the supine position, the mid-thigh point is determined as half the distance between the groin crease and the top of the patella. After the mid-thigh mark is marked with a sterile marking pen, the ultrasound transducer is positioned for a transverse view of the adductor canal into the mid-thigh. Under USG imaging, the femoral artery and saphenous nerve are identified. The distal position is determined where the USG probe moves away from the sartorius muscle of the femoral artery and proceeds deep into the adductor hiatus, and a 100 mm block needle passes the sartorius muscle with an in plane technique and 20 mL 0.375% Bupivacaine is administered to the lateral side of the femoral artery and saphenous nerve.

No nerve block procedure is applied to patients.

All patients who will undergo adductor canal block are sedated with midazolam 0.03 mg/kg in the preoperative preparation room, after standard monitoring. After 2-3 ml skin infiltration with 2% lidocaine under sterile conditions, a block is applied under USG guidance.To verify block success, sensory function is assessed by pinprick testing along the saphenous nerve distribution by comparing the pinprick sensation to the unaffected limb.All patients are monitored in the operating room and in a sitting position, 10-20 mg (2-4 ml) of heavy marcaine (0.5% bupivacaine hydrochloride and dextrose monohydrate) is applied to the subarachnoid space by entering the L3-4 or L4-5 space with a 25-gauge Whitrace needle.For postoperative multimodal analgesia, which is routinely applied to all patients, intravenous PCA (patient controlled analgesia )tramadol and paracetamol 10 mg / kg iv (8 hours apart) will be given.

VAS pain score was evaluated as "no pain" (score=0) and "worst pain" (score=10) and was divided into 3 groups according to the World Health Organization's pain intensity scale: score <3 mild pain, 3-6 mild-moderate. degree pain and >6 moderate-severe pain.

The first postoperative mobilization hours of the patients will be recorded.

The time between patients' admission and discharge will be recorded.