This article contains some figures that are displayed in color online but in black-and-white in the print edition.
Current affiliation for Mr. Alapan: Department of Mechanical & Aerospace Engineering, Case Western Reserve University, Cleveland, OH.
Rousseau MACottin PLevante SNogier ALazennec JYSkalli W: In vivo kinematics of two types of ball-and-socket cervical disc replacements in the sagittal plane: cranial versus caudal geometric center. Spine (Phila Pa 1976) 33:E6–E92008. (Erratum in Spine 33:829 2008)