 The investigators anticipate that the simple measure of wound catheter infusion with ropivacaine will demonstrate a significant safe and effective modality of analgesia in the postoperative period. If our results are valid, improved pain modulation with such a simple, low-tech modality of postoperative pain control a will require further investigation with a larger patient population including broader categories of surgical procedures to determine the limits of efficacy of such techniques in a particular surgical procedure, b may demonstrate statistically and clinically significant decreases in pain and decrease opioid demands, c may lessen time for recovery and side effects secondary to opioid use d offer significant cost-benefit for in-patient care relative to currently used modalities of epidural analgesia or systemic opioids for the management of postoperative pain in children undergoing UPJ correction and e compared to presently used epidural and PCA opioid analgesia, the wound catheter analgesia is expected to be less demanding on nurses and physicians i.e. Pain Treatment Service, staff time, attention and need for close monitoring. 