Enhanced Recovery After Surgery (ERAS) Total Knee Replacement (TKR) With a Transitional Pain Service

Inclusion Criteria: * Patients with osteoarthritis scheduled for a primary total knee arthroplasty with a participating surgeon * Planned use of regional anesthesia * Ability to follow study protocol * English speaking (secondary outcomes include questionnaires validated in English only) * Lives within one hour of the hospital * Has a smart phone Exclusion Criteria: * Hepatic or renal insufficiency * Younger than 18 years old or older than 65 years ol * Patients undergoing general anesthesia * Allergy or intolerance to one of the study medications * BMI \>40 * Diabetes * American Society of Anesthesiologists (ASA) status III or IV * Chronic gabapentin/pregabalin use (regular use for longer than 3 months) * Patients with chronic pain (from a referral to chronic pain service) or a pain catastrophizing scale (PCS \>30) * Patients with severe valgus deformity or flexion contracture * Patients unable to follow home catheter instructions and unwilling to go home with an infusing catheter * Patients who have no home caregivers in the event that a catheter is to be sent home with the patient * Patients with planned stay at rehab facility (to avoid medical device being tampered with at the rehab facility) * Non-English speakers (secondary outcomes include questionnaires validated in English only)