A prospective, randomized, single-blind, multicenter, noninferior clinical trial to evaluate the safety and efficacy of the PEEK knee prosthesis for total knee arthroplasty

INTERVENTION: Experimental group:PEEK knee prosthesis;Control group:Smith & Nephew knee prosthesis; CONDITION: FA20 /FA01 Rheumatoid arthritis/Osteoarthritis of the knee PRIMARY OUTCOME: KSS score''excellent rate''; SECONDARY OUTCOME: Success rate of postoperative imaging implantation;Prosthesis survival;Incidence of adverse events in total knee arthroplasty; INCLUSION CRITERIA: 1. Subjects aged 50‐80 years, and the gender is not limited. Young subjects should have urgent needs for surgery; 2. The subject's bones are mature; 3. The subject has indications for total knee replacement, such as: non‐inflammatory degenerative joint disease (such as osteoarthritis, traumatic arthritis or avascular necrosis); inflammatory degenerative joint disease (including rheumatoid arthritis); correction of functional deformities; 4. The affected limb on the test side is the first to receive total knee replacement; 5. Before surgery, subjects or guardians are willing and able to sign the informed consent.