Rheumatoid arthritis is a common chronic systemic connective tissue disease that can cause severe deformities. The lesions first invade the synovial membrane of the joints, and later destroy the joints, causing joint deformities. About 17% of the disease starts in the foot, and the forefoot is more common than the hindfoot, causing severe deformity and pain in the advanced stage, which makes it impossible to walk. In the forefoot, the main manifestations are outward deviation of the thumb and subluxation of the metatarsophalangeal joints, and the metatarsophalangeal joints are inclined to the metatarsal side. As the disease progresses, a callus may form at the metatarsal head of the subluxation at the bottom of the foot, and bunion deformity with lateral deviation of the metatarsophalangeal joints often occurs, with the appearance of bunions. As the disease progresses, hammertoes appear, and the affected toes may be severely deviated and overlap each other, making it difficult for the patient to continue to wear normal shoes. Rearfoot manifestations mainly include heel valgus deformity and osteoarthritis of the rearfoot, and in severe cases, the ankle joint is involved, which can cause severe pain and walking difficulties. Treatment of rheumatoid arthritis The treatment of rheumatoid arthritis of the foot is aimed at pain relief, prevention of deformity and correction of deformity, restoration and preservation of function, which requires a series of comprehensive treatment. 1.Bed rest is required in the acute stage, and in severe cases, short-term plaster or splint fixation is feasible to keep it in the functional position. Drug therapy (non-steroidal anti-inflammatory drugs, immunosuppressants, hormones, traditional Chinese medicine and other treatments) is needed when symptoms are obvious. 2.The combination of physical therapy and functional exercise can reduce local symptoms, maintain and improve joint function, and prevent the occurrence of deformity. When severe deformity and dysfunction occur in foot rheumatoid arthritis, patients usually need surgical treatment, and surgical treatment is a commonly used and effective method: 1. Early synovectomy can improve joint function and protect articular cartilage and bone tissues; 2. Joint clean-up surgery can be performed in the middle stage to prevent or slow down further joint damage; 3. When severe deformity and pain occur in the late stage, the Surgical treatments such as joint fusion, artificial joint replacement or arthroplasty are needed to eliminate pain, correct deformity and restore limb function.