Intervertebral spacer

A method for implant installation between adjacent vertebral bodies of a patient, comprising the steps of:

• assembling an implant onto an insertion tool;
• the implant having a support body and a rotatable insert therein;
• the support body having a plurality of radiopaque markers;
• wherein the support body includes a superior surface and an inferior surface, wherein at least one of the superior surface and inferior surface include a plurality of protrusions to facilitate prevention of expulsion of the implant once installed, and
• wherein the support body defines a first longitudinal opening extending longitudinally therethrough from the superior surface to the inferior surface;
• wherein the support body defines a second longitudinal opening extending therethrough from the superior surface with protrusions to the inferior surface with protrusions and positioned in between the proximal end and the distal portion to accommodate the rotatable insert therein and
• wherein the insert is rotatable about a longitudinal axis within the second longitudinal opening to permit the support body to rotate about the insert and the longitudinal axis;
• the installation instrument extending along a longitudinal tool axis;
• moving the installation instrument to a first position wherein the insert is rotationally fixed with respect to the support body and the implant is rotationally fixed with respect to the longitudinal tool axis;
• placing the implant into a patient through a transforaminal approach to locate the implant between adjacent vertebral bodies of a patient;
• advancing the implant between the adjacent vertebral bodies into an intervertebral space therebetween;
• moving the installation instrument to a second position wherein the support body is rotatable with respect to the insert;
• advancing the implant further into the intervertebral space such that the implant rotates with respect to the longitudinal tool axis and the plurality of radiographic markers move from a first position where they are not aligned radiographically to a second position where they are aligned radiographically.