How long it takes for a femoral head effusion to disappear is mainly related to the amount of effusion, treatment, and individual patient factors, and should be analyzed on a case-by-case basis, not as a generalization. If the patient has fluid in the bursa area around the femoral head after prolonged walking or strenuous exercise, i.e., bursitis of the femoral head, the patient can rest and avoid straining, and if necessary, can cooperate with skin traction of the affected limb to achieve the purpose of braking. Usually 1-2 weeks, the effusion can disappear after the inflammation is eliminated, the exact time varies from person to person. If the effusion around the femoral head is due to femoral head necrosis, it will take longer to disappear. Patients are advised to go to orthopedic department for examination in time, and a reasonable treatment plan will be formulated by a professional doctor according to the patient’s specific condition. In addition, patients with femoral head effusion can use physical therapy, such as acupuncture and physiotherapy, on a daily basis to promote the absorption of the effusion and to carry out appropriate activities to avoid joint stiffness.