A case report of post tetanic vertebra disclosed multiple thoracic vertebral changes of compressed fracture involving Tsub 4, Tsub 5, Tsub 6 and Tsub 7 with partial collapse of Tsub 3, Tsub 8, and Tsub 9. The mechanism of fracture were reviewed. In ordinary compressed fracture produced by acute flexion gowever post tetanic fracture can be produced by following opisthotonus. Several authors believed to be due to both extensor and flexor muscle groups of violent tetanc convultion with acute force to the weakest vertebra of Tsub 5 or Tsub 6 area.