Modular implant for fusing adjacent bone structure

A method for fusing vertebrae, comprising the steps of;

• providing an implant member for positioning between opposed bone structures, the implant member having a first end and a second end dimensioned to engage an end cap, and a segmentable portion having an outer wall defining an internal cavity for reception of bone growth inducing substances, the outer wall having at least one groove which extends substantially continuously about the outer wall to define a plurality of discrete ring-like segments, each ring-like segment including a plurality of apertures extending therethrough in communication with the internal cavity to permit fusion of the vertebral bone tissue, wherein none of the apertures and none of the at least one groove intersect each other;
• accessing the vertebral space defined between adjacent vertebral bodies;
• determining the desired implant member length for insertion into the space between the adjacent vertebral bodies by using one of the grooves as a cutting and/or measurement guide;
• sizing the implant member;
• and
• advancing the implant member within the vertebral space between the adjacent vertebral bodies.