Patient presents with complaints of chronic right knee pain, stiffness, and functional limitations consistent with osteoarthritis.  Symptoms include pain exacerbated by weight-bearing activities, limited range of motion, crepitus on examination, and morning stiffness lasting greater than 30 minutes.  Conservative management, including physical therapy, NSAIDs, and viscosupplementation, has failed to provide adequate relief.  Radiographic imaging reveals significant joint space narrowing, osteophyte formation, and subchondral sclerosis in the right knee, confirming the diagnosis of osteoarthritis.  Surgical intervention in the form of a total knee arthroplasty (TKA), also known as right knee replacement surgery, is recommended to alleviate pain, improve function, and enhance quality of life.  Risks and benefits of the procedure, including potential complications such as infection, DVT, and implant loosening, were discussed with the patient.  The patient understands the right knee replacement recovery process, post-operative physical therapy requirements, and the importance of follow-up appointments.  Surgical scheduling will proceed.  ICD-10 code M17.11, right knee primary osteoarthritis, and CPT code 27447, total knee arthroplasty, are relevant for this case.  Differential diagnoses considered include patellofemoral pain syndrome, meniscus tear, and ligamentous injury.  Pre-operative assessment including EKG, laboratory studies, and medical clearance will be completed prior to the scheduled surgery date.