Other factors 1, the role of external forces: in daily life and work, some people tend to have long-term lumbar force improper, excessive force posture or incorrect body position, etc.. For example, long-term bending work of coal miners and construction workers need to often bend over to lift heavy objects. These long-term repeated external force caused by the injury of the intervertebral disc over time, aggravating the degree of degeneration. 2, the weakness of the disc’s own anatomical factors: (1) intervertebral disc in adults gradually lack of blood circulation, repair capacity is also poor, especially after the degeneration, repair capacity is even weaker. (2) The posterior lateral fibrous ring of the disc is weaker, and the posterior longitudinal ligament is significantly reduced in width in the plane of lumbar 5 and sacral 1, and the strengthening effect on the fibrous ring is significantly weakened. (3) congenital anomalies of lumbosacral segment: deformities of lumbosacral segment can increase the incidence, these anomalies often cause unequal width of vertebral space and often cause more rotational strain on the synovial joints, so that the fibrous ring is subjected to different pressure and accelerates degeneration. 3, race, genetic factors: the incidence of colored people is lower; for example, the incidence of Indians and black Africans is significantly lower than other ethnic groups.