The patient will then be randomized into one of the two treatment arms. Prior to receiving either the study medication (ketamine) or the active control (morphine) the patient will be asked to rate their pain on a numeric rating scale (NRS) with 0 being no pain and 10 being the worst pain possible. Their baseline vital signs (blood pressure, heart rate, respiratory rate and oxygen saturation) will also be documented. These vital signs and the NRS will be reassessed at 5, 10 and 20 minutes post medication dosage. At 20 minutes they will also document a Richmond Agitation Sedation Scale (RASS) score and will ask the patient if they require additional pain medication. If the patient denies the need for a second dose of medication they will continue to be re-assessed every 20 minutes (vital signs, NRS, and RASS) until either inpatient admission, discharge home, transfer to the operating room or until a total of 120 minutes after initial dosing.