]]Stand-alone]] procedure (i.e. without screw instrumentation)
see Stand-alone cage.
For patients with ankylosing spondylitis and subaxial cervical spine fractures or dislocations, when surgical stabilization is required, posterior long-segment instrumentation and fusion or a combined anterior/posterior procedure (360° fusion). Anterior stand-alone instrumentation and fusion procedures are associated with a failure rate of up to 50% in these patients 1).