18. On post-operative day 1 and 2 a clinical research nurse will call to collect information from the diary for analysis. If sensory or motor blockade persists on day 2, then the patient will be called on day 3. If neurologic symptoms persist after 72 hours, the patient will be asked to come to pre-operative clinic for a neurologic examination by an anesthesiologist. If neurological deficits are present on exam, the patient will be referred to a neurologist. Neurology will then determine if further testing is required. In addition, all patients will be contacted by telephone at 2 weeks after study initiation. If any new neurologic deficits are reported at this time, patients will be brought into the preoperative clinic and undergo the same evaluations.