Our aim will be to investigate the efficacy of dexmedetomidine as an adjuvant to bupivacaine in ultrasound guided pericapsular nerve group (PENG) block for postoperative analgesia in hip replacement surgeries.
* Our primary outcome of the study: total amount of postoperative morphine consumption in the first 24h postoperative. * Our secondary outcome of the study: postoperative analgesia assessed by pain score (by Visual Analog Scale)
Patients aged from 18 years to 90 years
Gender : both males and females
BMI less than 35 kg/m2
Patients with American society of anesthesiologists (ASA) classification class I , II or III
Patient declining to give written informed consent
Patient with infection at the site of injection
Patient with coagulopathy
Patients with known allergy to used medications.