Lying flat supine posture to do leg lifting action, the limb bones appear rattling, may be due to the following reasons: 1, if the leg lifting action makes the lumbar rattling, it is likely to be caused by suffering from lumbar spine diseases, such as lumbar intervertebral disc herniation, lumbar transverse syndrome, lumbar muscle strain, etc., lying flat and lifting the leg, the human body’s lumbar vertebrae will be due to the leveraging force of the legs, so that lumbar deformation of lumbar vertebrae, lumbar vertebrae ligaments, Lumbar muscles, lumbar intervertebral discs will be subjected to the role of leverage, the prominent intervertebral discs will move, the damage to the lumbar muscle scar will be pulled, lumbar vertebral transverse process and muscle friction and so on, will lead to lumbar rattling. 2, if you lift your leg with the hip joint rattling, most likely because of hip joint laxity caused by lifting the leg will be the hip as a pivot, prying the hip joints, the joints, once the relative The joints, once relatively loose, will make the joint bones collision and rattling.