PENG vs PHPB for Hip Arthroplasty Analgesia

Inclusion Criteria: * Patients scheduled for elective total hip arthroplasty (THA) under spinal anesthesia * ASA physical status I-II * Age ≥18 years * Body Mass Index (BMI) between 18-35 kg/m² * Patients who provide written informed consent Exclusion Criteria: * Age \<18 years * ASA physical status ≥III * Known allergy or contraindication to study medications (local anesthetics, opioids, etc.) * Severe cardiac, renal, hepatic, or pulmonary failure * Revision total hip arthroplasty * Coagulopathy or anticoagulant use * Local infection or neuropathic findings at the injection site * Chronic inflammatory diseases or chronic corticosteroid use * Diagnosed neuropsychiatric disorders * Pregnancy or lactation * Inability or unwillingness to read, understand, or sign the informed consent form * Obesity (BMI \>35 kg/m²) * Failed spinal anesthesia or conversion to general anesthesia * Active malignancy or patients receiving radiotherapy/chemotherapy * Active systemic infection or ongoing antibiotic therapy (except prophylaxis) * Contraindication to regional anesthesia techniques * Chronic opioid or analgesic use for pain disorders * History of intracranial mass, increased intracranial pressure, epilepsy, cerebrovascular accident, neuromuscular disease, or motor/sensory deficits