There have been many reports on fracture-dislocation of the lumbar spine in recent years. Hyperextension as a mechanism for fracture-dislocation in the thoracolumbar spine was first described by Holdsworth accounting for only less than 3 percent of all fractures of the spine. De Oliverira reported an unusual pattern of sagittal shear fracture-dislocation secondary to posterior impact injuries. Hyperextension injuries result in the disruption of all ligaments &
supporting elements of the spine starting with the anterior column. Sagittal translation and comminution of the posterior elements are the most common radiographic findings. Computed Tomography can accurately demonstrate the destruction of the posterior elements, and MRI is able to demonstrate the anterior ligamentous disruption. Nearly all cases suffered from paraplegia known as lumberjack paraplegia or severe neurological deficit. A case of complete fracture-dislocation of the L4-5 resulting from hyperextensive injury without lumberjack paraplegia or neurological deficit is presented. The diagnosis &
treatment will be discussed.
Injection of PMMA bone cement into fractured vertebral bodies has been used clinically and proved to be effective. However, there are concerns about thermal injury to the cord and interferece of bone remodling .The purpose of this study is to use the biodegradable bone substitute as an alternative for augumentation of fractured vertebral bodies .