Zero-P. Zero profile anterior cervical interbody fusion (ACIF) device.

AO PrinciplesIn 1958, the AO formulated four basic principles, which havebecome the guidelines for internal fixation 13 . They are:– Anatomical reduction– Stable fixation– Preservation of blood supply– Early, active mobilizationThe fundamental aims of fracture treatment in the limbsand fusion of the spine are the same. A specific goal in thespine is returning as much function as possible to theinjured neural elements 13 .AO Principles as applied to the spine 14Anatomic reductionIn the spine, this means reestablishing and maintaining thenatural curvature and the protective function of the spine. Byregaining this natural anatomy, the biomechanics of thespine can be improved, and a reduction of pain can be experienced.Stable fixationStabilization of the spinal segment to promote bony fusion.Biomechanical tests have demonstrated that the Zero-Poffers comparable stability to that of a spacer combined withanterior plate fixation in flexion, extension and lateral bending,and torsion.Preservation of blood supplyCreation of an optimal environment for fusion.Early, active mobilizationMinimized damage to the spinal vasculature, dura, andneural elements, which may contribute to pain reduction andimproved function for the patient.Synthes 5