[3,11,14] Table 1. Concentrations of Cobalt and Chromium Ions for the Group of Patients 14.8 Months After Implantation of the Maverick TDA and for the Control Group . From Spine Release of Cobalt and Chromium Ions Into the Serum Following Implantation of the Metal-on-Metal Maverick-Type Artificial Lumbar Disc (Medtronic Sofamor Danek) Alexander