Minimally invasive knee surgery for six months calf is still swollen consider the continued development of osteoarthritis, lower extremity vein partial obstruction. Minimally invasive knee surgery is generally used to treat intra-articular ligament injuries, meniscus injuries, and can also be used to clean up bony encumbrances, hyperplastic synovium, etc., but it cannot completely treat osteoarthritis. With the gradual aggravation of osteoarthritis over time, the fluid in the joint cavity can compress the veins of the lower limbs, and also due to reduced activity, venous thrombosis can be formed, which obstructs venous return causing edema in the lower legs. The patient himself has lower limb vein partial obstruction, causing venous return dysfunction, the return of blood is affected causing lower limb edema. Swelling of the lower leg is recommended to actively seek medical attention to clarify the cause of the disease, and treatment under the guidance of physicians.