ABSTRACT
As the golden standard, Anterior Cervical Discectomy and Fusion (ACDF) has been the most accepted procedure for the surgical therapy of cervical spondylosis for decades. However, ACDF altered the normal biomechanical characteristics of the cervical spine because the mobility decreased dramatically at the instrumented levels and the motion increased at the adjacent levels. Although ACDF often gets satisfactory effects in the short-term, the biomechanical stresses at adjacent levels increases according to fusion and this may result in the acceleration of Adjacent Segment Degeneration (ASD). As an alternative choice to fusion, Artificial Cervical Disc Replacement (ACDR) has been applied for cervical degenerative disc disease. Recent studies report that short-term results after ACDR were at least as good as those for ACDF (Ryu W.H.A et al. 2013).
