The investigators will investigate the efficacy of using CR and PS implants in TKA. The investigators will conduct TKA with different implants simultaneously on one patient to compare the post-operation efficacy of both implants.

A randomized, single-center, single group study comparing the efficacy and safety of using CR and PS implants in TKA. The investigators will conduct TKA with different implants simultaneously on one patient to compare the post-operation efficacy of both implants. Subjects will be monitored through postoperative follow-up to understand the bilateral knee condition.

Inclusion Criteria:

• Adult patients who plan to undergo primary total knee arthroplasty on bilateral knee joint with a diagnosis of osteoarthritis or rheumatoid arthritis, etc.;

Exclusion Criteria:

• Those who do not meet the inclusion criteria;
• Neuromuscular dysfunction;
• Diseases affecting postoperative efficacy evaluation