[Biomechanical evaluation of cervical stability with Halifax clamp after bilateral facetectomy]

With nine fresh adult cervical spine specimens (C3-T1), the three-dimensional motions of C4-5 segment were analysed to evaluate the immediate stability following bilateral facetectomy, Halifax clamp and wire fixation. The results showed that the stability with Halifax clamp was greater than that of the intact state in flexion, extension and lateral bending, but the same as in axial rotation. The stability with wire fixation was greater than that in flexion and equal to that in extension, lateral bending and axial rotation. The ROMs with Halifax Clamp were less than those with wire fixation in flexion, extension and lateral bending, but close to in axial rotation.