A method for replacing at least a portion of an intervertebral disc in a spinal
column includes: removing the portion of the intervertebral disc from the spinal
column; and inserting an apparatus for replacing the portion of the intervertebral
disc into an intervertebral disc space defined substantially between adjacent vertebral
bones of the spinal column, and positioning the apparatus between the vertebral
bones, wherein the apparatus is operable to permit the adjacent vertebral bones
to articulate relative to one another about at least one of: (i) a first center
of rotation for at least one of flexion and extension that is located outside the
intervertebral disc space, and (ii) a second center of rotation for lateral bending
that is located outside the intervertebral disc space.