Adding Value in Knee Arthroplasty Post-total Knee Replacement (TKR) Care Navigator Trial

The objectives of this research are to: Conduct a proof of concept randomized controlled trial with up to 300 patients undergoing primary total knee replacement (TKA) at Brigham and Women's Hospital (BWH). The trial will compare a "Care Navigator" post-discharge intervention versus "Usual Care" post discharge management of patients undergoing TKA. The intervention will focus on the challenging process of transitions from the acute care hospital to inpatient or outpatient rehabilitation, and from inpatient rehabilitation to home. The principal goals of the trial are: 1. To establish whether "Care Navigator" intervention improves functional outcomes as compared with the "Usual Care" treatment six months after TKA surgery. 2. To establish whether "Care Navigator" intervention is cost effective six months after TKA surgery. The investigators hypothesize that: 1. Incorporating the Care Navigator role into the "Usual Care" treatment will increase TKA patients' rate of adherence to the rehabilitation protocol and improve functional outcomes. 2. Addition of a Care Navigator is cost-effective.