 The investigators hypothesize that continuous infusion of local anesthetic via a wound catheter would improve postoperative pain control after UPJ correction and diminish the adverse effects associated with current use of opioids, administered via epidural or systemic route, for the management of postoperative pain. The expected benefits from wound catheter infusion are reduction in postoperative opioids requirement thereby diminishing the associated side effects of sedation, respiratory depression, nausea, vomiting, and ileus which occur at an average rate of 50 in children and adolescents based on recent meta-analysis. It may also facilitate early oral intake, ambulation and early discharge from the hospital. 