Joint surgery 1. synovectomy remains the most common and important procedure. Timely removal of the diseased synovium can prevent devastating late sequelae, and even in more advanced stages, synovectomy can prevent further deterioration of the joint lesion and reduce pain; 2. capsule and ligament folding to address laxity of the joint capsule and ligaments due to inflammatory synovial exudation on the capsule and ligament overstretching; 3. 3, Capsular and ligamentoplasty for reconstruction of the joint capsule and ligaments in case of rupture or defect; 4, Tendon fixation for joint stability when neither capsule folding nor plication can be applied. For example, tendon strips are applied to the flexor side of the proximal interphalangeal joint to prevent hyperextension of the proximal interphalangeal joint to correct goose neck deformity; 5. Arthroplasty, which can be performed by placing autologous tissue between the joints or artificial joint replacement; 6. Fusion, which is applied when joint stability is required or when arthroplasty is not effective, such as the metacarpophalangeal and interphalangeal joints of the thumb.