Continuous Epidural Analgesia Versus Continuous Supra-Inguinal Fascia Iliaca Block in Total Hip Replacement Surgery

Inclusion Criteria: * orthopaedic patients, American Society of Anesthesiologists (ASA) physical status I-III, scheduled to undergo unilateral total hip replacement surgery via lateral approach Exclusion Criteria: * 1- History of neurological/neuromuscular, psychiatric disease, dementia preventing proper comprehension. 2- Patients younger than 18 years or older than 80 years. 3- Patients with Body Mass Index (BMI) \<18.5 or \>30 kg/m2. 4- Coagulation disturbances (INR\>1.4, platelet count\<100 000). 5- History of opioid dependence (opioid use within the last 4 weeks). 6- History of allergies to study medications. 7- Other contraindications to neuraxial blockade (e.g., patient refusal, local/systemic sepsis, low fixed cardiac output). 8- Contraindications to continuous fascia iliaca compartment block (e.g., infection overlying the injection site or previous femoro-popliteal bypass surgery).