- Patient qualifies for primary total knee arthroplasty based on physical exam and medical history, including diagnosis of severe knee pain and disability due to at least one of the following: a) rheumatoid arthritis, osteoarthritis, traumatic arthritis, polyarthritis; b) collagen disorders and/or avascular necrosis of the femoral condyle; c) post-traumatic loss of joint configuration, particularly when there is patellofemoral erosion, dysfunction or prior patellectomy; d) moderate valgus, varus, or flexion deformities; or e) the salvage of previously failed surgical attempts that did not include partial or total knee arthroplasty of the ipsilateral knee