**2.4 Porous-Coated Motion (PCM) Cervical Arthroplasty**

The Porous-Coated Motion (PCM) Cervical Arthroplasty (Cervitech, Rockaway, New Jersey) consists of two cobalt-chrome-molybdenum (CoCrMo) endplates that have a titanium calcium phosphate porous coated backing for bone ingrowth. The device is inserted by a "press-fit" method, but the endplates have transverse serrated rows of teeth that resist migration. The bearing surface is an ultra high molecular weight polyethylene (UHMWPE) convex insert of large radius of curvature attached to the inferior endplate which articulates with the polished CoCrMo concave surface of the superior endplate. (Figure 4)

(Courtesy of Paul McAfee, MD) Fig. 4. Porous Coated Motion (PCM) Cervical Arthroplasty
