**2.3 ProDisc-C**

ProDisc-C Cervical Disc Prosthesis (Synthes, West Chester, Pennsylvania) has a ball and socket design, with endplates made of a cobalt-chrome alloy. The endplates have keels for immediate fixation and titanium plasma spray backing for bone ingrowth. The bearing surface has an articulating dome of ultra high molecular weight polyethylene (UHMWPE) attached to the inferior endplate and a concave polished socket integral to the superior endplate. (Figure 3)

(Courtesy of Synthes, West Chester, Pennsylvania) Fig. 3. ProDisc-C Cervical Disc

Cervical Disc Arthroplasty 503

the physiologic center of rotation to avoid increased strain on the facet joints. (Darden &

(Reprinted from: Bogduk N, Mercer S. Clin Biomechanics, 2000)

enclosed circles shown.

Fig. 5. Mean instantaneous axes of rotation for each motion segment of the cervical spine depicted with a dot. Two standard deviation range of distribution is located within the

Raposo, pending)
