[Biomechanical evaluation on the primary stability of cervical spine instrumented with aliform type cervical intervertebral fusion cage].

We sought to test the primary stability offered by aliform cervical intervertebral fusion cage (ACIFC) and to evaluate its biomechanical effect. The anterior cervical spinal fusion procedures with ACIFC were simulated in ABAQUS software. The angular range of motion (ROM) and the stress distribution were quantified to assess the primary stability and the biomechanical relation of the cervical spines. The ROM decreased by 25y and when it was compared with the noninstrumented, a significant difference was seen (P < 0.01). As the ACIFC has the function of pullout resistance and provides good environment for spinal fusion, it can supply enough primary stability for the anterior cervical spinal fusion.