Diagnosis and treatment of cauda equina entrapment in the vertical lamina fracture of lumbar burst fractures.

Posterior dural lacerations associated with lumbar burst fractures are caused by impaction of the dural sac into the vertical lamina fracture. Neural elements may be extruded outside of the dura and become entrapped in the lamina fracture. This diagnosis must be made before surgery and is based on the patient's clinical presentation, the fracture pattern, and the radiographic findings. Entrapped neural elements can be successfully extracted from the lamina fracture by an opening laminoplasty of the posterior neural arch. Patients with lumbar burst fractures and radiographic evidence of posterior displacement of the neural elements in the lamina fracture should undergo posterior exploration of the spinal canal, extraction of cauda equina neural elements, and repair of the dural laceration before any spinal reduction maneuver.