Lying down and lifting and releasing the hip bone may be physiological rattling, or it may be caused by trauma, aseptic inflammation of the soft tissues around the hip joint, and pathological reasons such as lesions of the hip joint itself. 1. Physiological rattling: due to friction between the gluteus maximus muscle or iliotibial bundle and the cartilage around the hip joint or the greater trochanter of the femur, the hip bone rattling can occur in patients who lie down with their legs lifted and put down, which is generally incidental and is called physiological rattling. 2. Trauma: due to trauma, strenuous exercise and other causes of labral tear, hip joint injury, when the leg is lifted and released to pull the corresponding tissues, hip bone ringing can occur. 3. Aseptic inflammation of soft tissues around the hip joint: due to long-term hip joint strain factors caused by aseptic inflammation of soft tissues around the hip joint, lying down leg lifting and releasing can also appear hip bone ringing. 4. Hip joint itself lesions: such as hip dysplasia, osteoarthritis, femoral head necrosis and other diseases, hip joint dislocation, cartilage damage, etc., lying leg a lift a release can appear hip bone ring, as well as pain, activity restriction and other symptoms. Lying leg a lift a put hip bone ringing may also have other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, give targeted treatment or treatment.