Dexamethasone vs. Dexmedetomidine for ESPB in Pain Management After Knee Arthroplasty

Inclusion Criteria: * patients undergoing primary hip arthroplasty * aged \>18 years and \<100 years * ASA physical status 1, 2 or 3. Exclusion Criteria: * if they refused to participate, * had a history of opioid abuse, * had an infection of the site of needle puncture, * were less than 18 years of age, * were postponed as having ASA 4 or 5, * had an allergy to any of the drugs used in the study, * renal failure (estimated glomerular filtration rate \<15ml/min/1.73m2), * liver failure, * known or suspected coagulopathy, * pre-existing anatomical or neurological disorders in the lower extremities, * intellectual disability with problems in pain evaluation, * severe psychiatric illness.