Study aims to comparision of two postoperative analgesic techniques in patients undergoing lumbar spine surgeries

INTERVENTION: Intervention1: Quadroiliac plane block: 20ml of 0.25%bupivacaine usg guided B/L block will be given preoperatively Control Intervention1: Erector spinae plane block: 20ml of 0.25% bupivacaine usg guided B/L block will be given preoperatively CONDITION: Health Condition 1: PCS‐ Health Condition 2: O‐ Medical and Surgical PRIMARY OUTCOME: To compare postoperative pain scores NRS at rest and during movementTimepoint: Time interval 1,2,3,6,12,24,48hrs SECONDARY OUTCOME: To Measure total doses of rescue analgesic paracetamol and Duration of 1 rescue analgesic postoperativelyTimepoint: Time interval first 24hrs INCLUSION CRITERIA: Patients of ASA1 and ASA2 Patients of Aged 18yrs to 60yrs Patients undergoing elective lumbar spine surgery under GA