Traumatic lumbar fracture-dislocation is a rare condition. Congenital spinal deformities may facilitate the occurrence of this case. We diagnosed spina bifida occulta accompanied at the same level by a L2 anterior dislocation which resulted from a vehicle in-site traffic accident in a 35-year-old female patient. Posterior intervention was carried out during therapy, and reduction and stabilization were performed by means of a T12-L1 and L2-L3 trans-pedicular screw. In patients with a congenital spinal anomaly the effect of spinal traumas may be greater than normal. Therefore, spinal traumas in patients with a congenital spinal anomaly should be assessed more carefully.