Comparative biomechanical evaluation a lumbar spacer with integrated screws

INTRODUCTION The goal of lumbar spinal fusion is to limit pain by decompression and removal of soft tissues, followed by the formation of a rigid bony union between adjacent vertebrae. The general consensus for a rigid fusion construct requires careful preparation of the intervertebral space and the creation of a rigid fusion construct. Anterior lumbar interbody fusion (ALIF) provides good access to the intervertebral space and has been shown to yield excellent fusion results, especially with supplemental posterior fixation. However, supplemental posterior fixation requires a secondary procedure and is associated with additional complications. Threaded interbody cages provide one stand-alone alternative, but have issues including imaging limitations and subsidence risks. A PEEK interbody cage has been developed with incorporated screws so that additional fixation and resistance to graft extrusion could be provided without the use of blocking screws, plates, or pedicular fixation.