Figure 2From: Anterior cervical discectomy and fusion: Comparison of titanium and polyetheretherketone cages CeSpace ® TTN-cage with Plasmapore ® coating and fixation ring (top) and CeSpace® PEEK-cage (bottom). Note that the Peek-Cage has a slight convex shape of the upper surface, while the TTN-cage is plane.Back to article page