Apparatus and method for performing spinal surgery

An intervertebral prosthetic device for implantation in a spine comprising:

• a fixation member configured to be placed in a cavity of a vertebral body, the fixation member comprising:
• an outer member configured to be placed against bone of the vertebral body;
• an inner member opposite the outer member;
• and
• at least one adjustment element that extends from the outer member to the inner member and that is configured to adjust a length dimension of the fixation member between the inner and outer members along its longitudinal axis;
• a compressible member configured to be placed in a cavity in an intervertebral disc adjacent the vertebral body, configured to replace the nucleus pulposus of the intervertebral disc, configured to be surrounded by the annulus fibrosis of the intervertebral disc, and configured to be secured to the inner member of the fixation member;
• and
• a spacer sized to fit between the outer and inner members of the fixation member to maintain the fixation member at a desired length dimension, wherein the spacer extends from the outer and inner members of the fixation member such that the spacer is configured to be axially unaligned with the at least one adjustment member.

An intervertebral prosthetic device for implantation in a spine, comprising:

• a fixation member configured to be placed in a cavity of a vertebral body, the fixation member comprising:
• an outer member configured to be placed against bone of the vertebral body;
• an inner member opposite the outer member;
• and
• a longitudinal axis extending between the outer and inner members;
• and
• a compressible member configured to be placed in a cavity in an intervertebral disc and to be secured to the inner member of the fixation member,
• wherein:
• (A) the compressible member is constructed to remain compressible after implantation, and
• (B) the outer member includes a tab extending outward along an axis different from the longitudinal axis.

A prosthetic device comprising:

• a fixation member sized to fit within a cavity in a first vertebral body;
• and
• a compressible member comprising:
• a cup-shaped base member;
• an upper member;
• and
• one or more compressible elements provided between the base member and the upper member,
• wherein the compressible member is sized to substantially replace a nucleus pulposus of an intervertebral disc adjacent the vertebral body.

A prosthetic device comprising:

• a fixation member sized to fit within a cavity in a first vertebral body;
• and
• a compressible member comprising:
• a base member;
• an upper member comprising a ball-and-socket joint;
• and
• one or more compressible elements provided between the base member and the upper member,
• wherein the compressible member is sized to substantially replace a nucleus pulposus of an intervertebral disc adjacent the vertebral body.