In Brief:
To our knowledge, this serves as the first in vivo time-course study investigating the use of the Porous Coated Motion device (Cervitech, Inc., Rockaway, NJ) for cervical arthroplasty. Segmental intervertebral motion was preserved, while at the same time permitting porous osseointegration at the prosthesis-bone interface. Based on histopathologic review of local and systemic tissues, there was no evidence of wear debris or significant histopathologic changes in any treatment.