How Surgery Using the Mobi-C Compares to Fusion

Before artificial discs were approved for use, most often a patient would get an anterior cervical discectomy and fusion (ACDF). In this fusion surgery, the doctor removes the unhealthy disc. The empty disc space is filled with a bone spacer or plastic implant. The implant helps match the disc height to the levels above and below. Restoring the disc height can help remove pressure on the nerves and/or spinal cord. Then, a metal plate with screws is placed on the front of the neck. However, studies have shown cervical disc replacement to have benefits over fusion.

The plate helps:

  • Keep the spacer in place.
  • Stop movement at that level. This helps new bone grow between the vertebrae (fusion).

neck fusion with spacers and a plate

Cervical Disc Replacement with Mobi-C

In a surgery with the Mobi-C Cervical Disc, the unhealthy disc is removed, but instead of a bone spacer or plastic implant along with a plate and screws, a Mobi-C is implanted into the disc space. Where a fusion procedure is intended to eliminate motion at the surgery levels, the goal of a surgery with Mobi-C is to allow motion at those levels.

Both fusion and Mobi-C artificial disc surgery:

  • Replace the damaged disc.
  • Try to match a healthy disc height to help un-trap any nerves.

Only the Mobi-C implant:

  • Tries to maintain neck movement.
  • Fits entirely within the disc space.


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