Background: Postoperative pain after total knee replacement surgery is an unpleasant memory for the patients. Different techniques have been tried to elevate the post-operative pain. A femoral nerve block with local anaesthetics is considered to bethe gold standard for postoperative pain.But the painfree period after the femoral nerve block lasts for a few hours only.Several adjuvants have been triedwith local anaestheticsto prolong analgesics’ duration and avoid the adverse effects of NSAIDsandopioid use.