Inclusion Criteria:  ASA 1-3 Age 18 to 85 years BMI 18 to 40 kg/cm2 Patient with primary as well as revision knee and hip arthroplasty under regional anesthesia only. Provision of written informed consent.  Exclusion Criteria:  Language barrier or difficulty in communication: inability to read write or speak English Allergy to morphine Patients under increased risk for respiratory depression with intrathecal morphine (central apnea) Patients with pre-existing urinary problems Women of child bearing potential not on birth control Patients with chronic pain who are currently on pain medications Patients with cognitive impairment Patients who have alcohol and/or other substance dependency