The lumbar bones ringing when the leg is lifted and lowered may be caused by several reasons: First, there may be a fracture of the isthmus of the lumbar spine. This type of disease is often due to some genetic factors, or acquired trauma to the lumbar region, which in turn leads to the fracture of the isthmus of the lumbar vertebral arch. In this case, the instability of the lumbar vertebrae may occur, and in the process of raising and lowering the patient’s leg, there may be some abnormal activities between the lumbar vertebrae, thus producing a bone ringing situation. At this time, the patient is likely to feel pain in the lumbar region and have some intermittent claudication, that is, in the process of the patient’s activities, there may be pain in the lumbar region and lower extremities, and cannot walk, but can walk again after resting for a while. Secondly, this condition may be caused by some old injuries of the lumbar region. For example, if the patient has old or compression fractures of the lumbar spine, or old fractures of the spinous process or transverse process, similar symptoms may occur during the recovery process. Third, this condition may also be caused by lesions related to the sacroiliac joint. For example, when the sacroiliac joint has sacroiliac arthritis, compulsory spondylitis and other diseases, there may also be similar symptoms.