It is intended to reduce the pathologies of the cervical spine by restoring the disc height as well as the physiological bending of the spine and by allowing the fusion of vertebral bodies between them. Acifbox implants are used with dedicated instruments for site preparation, implant insertion and removal.
The concept was initiated by Bagby and has been used in the human spine since 1988. The rectangular cages used resemble the dimensions and anatomy of the disc space and vertebral end plates. There are concerns with stand-alone cage usage regarding expulsion and migration of the cage