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A low-cost, accurate device to measure and record knee range of motion (ROM)is of the essential need to improve confidence in at-home rehabilitation. It isto reduce hospital stay duration and overall medical cost after Total KneeArthroplasty (TKA) procedures. The shift in Medicare funding from pay-as-you-goto the Bundled Payments for Care Improvement (BPCI) has created a push towardsat-home care over extended hospital stays. It has heavily affected TKApatients, who typically undergo physical therapy at the clinic after theprocedure to ensure full recovery of ROM. In this paper, we use accelerometersto create a ROM sensor that can be integrated into the post-operative surgicaldressing, so that the cost of the sensors can be included in the bundledpayments. In this paper, we demonstrate the efficacy of our method incomparison to the baseline computer vision method. Our results suggest thatcalculating angular displacement from accelerometer sensors demonstratesaccurate ROM recordings under both stationary and walking conditions. Thedevice would keep track of angle measurements and alert the patient whencertain angle thresholds have been crossed, allowing patients to recover safelyat home instead of going to multiple physical therapy sessions. Theaffordability of our sensor makes it more accessible to patients in need.

Range of Motion Sensors for Monitoring Recovery of Total Knee Arthroplasty