Evaluating the Efficacy of the Psoas Sheath Block for Post Operative Analgesia Following Hip Arthroplasty

Inclusion Criteria: * Participants aged \>18 * Patients scheduled to undergo elective unilateral total hip replacement (THR) surgery. * Patients who agree to receive regional anaesthetic blocks as part of their post-operative pain management. * Physical Status: ASA (American Society of Anesthesiologists) physical status classification I-III. * Patients who are willing and able to provide informed consent, demonstrating an understanding of the trial's purpose, methods, and potential risks. * Patients who are willing to comply with assessments post-surgery Exclusion Criteria: * Allergy to Study Medications * History of chronic opioid use (\>50mg of oral morphine equivalents per day. * Any neurological condition affecting the lower extremities (e.g., peripheral neuropathy, radiculopathy) that could interfere with pain assessment or recovery evaluation. * Infection at Injection Site * Coagulopathy or Anticoagulant Use: Patients with coagulopathy (INR \>1.5) or who are on anticoagulant therapy that cannot be safely discontinued for the block procedure. * Severe Respiratory or Cardiovascular Disease: Any severe respiratory or cardiovascular disease (e.g., severe chronic obstructive pulmonary disease, heart failure) that may increase perioperative risk and complicate recovery. * Cognitive impairment or conditions (e.g., dementia with MMSE \<24) that would prevent reliable pain reporting or compliance with post-operative assessments