Randomized, Controlled Trial Comparing the Effectiveness of Sedation-Epidural Anesthesia to Spinal Anesthesia in Outpatient Hip or Knee Arthroplasty.

Inclusion Criteria: * Patient has symptomatic hip or knee OA requiring primary joint replacement (not associated with unusual treatments such as bone graft, concomitant osteotomy, revision implant, etc.). * Patient who is candidate for our ERAS program * Patient understands the study condition * Patient capable of giving informed consent. * Someone to accompany the patient to the Pre-admission Clinic and hospital the day of the surgery and to be available in the first postoperative week during home recovery. Exclusion Criteria: * Patients with contraindication to NA (spinal anatomical abnormalities, coagulation disorders, infection at the puncture site) * Allergy to LAs used in the study * Unable to communicate with the investigators, unable to read the questionnaire, unable to keep track and notes of the medication taken at home * Lack of home services offered by the local community service centre in the area. * BMI \> 40. * Psychiatric disease limiting participation or interfering with the ability to provide consent or assessment * Need for long-term urinary Foley catheter post-op. * Allergies to sulfonamides or other medications specified in the protocol. * Cognitive impairment or communication problem * Pulmonary embolism or deep vein thrombosis in the past year. * Need for long-term anticoagulation therapy. * Current corticotherapy or systemic corticotherapy in the past year (unless confirmation of a cortrosyn test prior to surgery). * Systemic disease involvement (di…