There is debate as to the cause, although hematogenous seeding of the offending organism is favored as well as direct spread. It is important to differentiate between spontaneous<unk>  which is usually from hematologic spread from a urinary or respiratory infection versus that from a post-operative complication which usually involves skin flora such as staph aureus. It can be caused due to spinal tuberculosis and spread along spinal ligament to involve the adjacent anterior vertebral bodies, causing angulation of the vertebrae with subsequent kyphosis.The cause may be aseptic.
Discitis
Spondylolisthesis
Fibrous ankylosis
Spondylodiscitis
Spondylolysis
Vertebral osteomyelitis
Spinal fracture
Osteomyelitis