The patient, a 68-year-old female, was unable to walk due to years of exertion, wear and tear of the knee joints, arthritis, and severe pain. She was diagnosed with severe osteoarthritis in both knees and underwent bilateral total knee replacement. The cost was about 90,000-100,000 yuan. The patient had rural cooperative village medical treatment, and according to the provincial agricultural cooperative policy, there was a subsidy for this case, and the actual patient cost for bilateral knee replacement surgery was about 27,000 yuan (70% reimbursement).