Iliac fascia block has a long history of analgesia in patients with hip fractures. A large number of clinical studies have confirmed its efficacy, and there are also randomized controlled studies supporting its effectiveness in analgesia after total hip replacement surgery.Quadratus lumborum block is a new block technique developed in last decade, and there are also a few randomized controlled studies supporting its effectiveness in postoperative analgesia for total hip replacement.The purpose of the present study was to find out whether these two different approaches of fascial compartment block have similar effects on postoperative analgesia after total hip replacement.

Inclusion Criteria:

• ASA class 1-3
• BMI between 20-36kg/m^2
• Scheduled to undergo total hip replacement

Exclusion Criteria:

• A history of chronic opioids or steroid consumption
• Coagulapathy or anticoagulation
• Pregnancy
• Allergic to local anesthetics Neurological dysfunction