Fluid accumulation in the bone is caused by bone cysts, which may be due to bone and joint injury during exercise. If the amount of fluid is relatively small, local braking and elevation of the affected limb above the level of the heart can help absorb the fluid. If the amount of fluid is relatively large, the joint cavity should be punctured to avoid excessive pressure in the bone and joint, which may affect the blood circulation of the surrounding soft tissues and periosteum and lead to osteonecrosis. If the effusion is caused by sports injury, it needs to be treated with blood circulation and pain relief, and oral Nimesulide and Panax notoginseng capsules can be taken.