The cause of lumbar bone rattling when supine stirrups may be lumbar muscle strain, lumbar intervertebral disc herniation, hip joint laxity and other reasons. 1. Lumbar muscle strain: long-term stooping activities or use of the waist for labor activities, will lead to lumbar muscle injury, resulting in hyperplasia, fibrous degeneration and other changes, the human body supine stirrups, will increase the muscle and the surrounding joints and other structures of the friction, thus lumbar vertebrae bones will ring. 2. Lumbar disc herniation: the nucleus pulposus in the center of the lumbar disc will protrude into the surrounding annulus fibrosus under the effect of long-term strain, thus increasing the friction between the lumbar disc and the surrounding ligaments, fascia and other tissues during the activity, resulting in lumbar vertebrae bone rattling. 3. Hip joint laxity: If the body’s hip joint is lax, the process of supine stirrups will lead to collision between the hip joint and the surrounding tissues and joints, resulting in lumbar vertebrae bone rattling. In order to relieve the symptom of lumbar bone rattling during supine stomping as soon as possible, it is recommended to go to the hospital as soon as possible.