Effectiveness of Ultrasound-Guided Erector Spinae Plane Block for Postoperative Pain Control in Open Knee Surgeries

Inclusion Criteria: * • Patients aged from 18 to 60 years old. * Genders eligible for study: both sexes. * ASA I-II. * Undergo knee surgery. * BMI from 18 to 35 kg/m2. Exclusion Criteria: * • Patient refusal. * Patients with difficulty in evaluating their level of pain. * Contraindications to regional anesthesia (Bleeding disorders e.g. INR\>1.5, PC\<70%, platelet count\<100 × 109, Use of any anti-coagulants, local infection, etc.). * Known allergy to local anesthetics.