An interbody fusion device , the device comprising: a base member including at least one of a pivot cylinder and a hinge channel ; a top member including at least one of a pivot cylinder and a hinge channel , wherein the at least one pivot cylinder of the base member engages the at least one hinge channel of the top member and the at least one pivot cylinder of the top member engages the at least one hinge channel of the base member ; and at least one movement mechanism engaging the top member and the base member , the at least one movement mechanism comprising: a first expansion assembly having a first cylindrical gear , a first threaded rod , and a first load head , the first cylindrical gear comprising a plurality of depressions on an exterior surface of the first cylindrical gear and a plurality of threads on an interior surface, the first threaded rod comprising a plurality of threads on an exterior surface of the first threaded rod for engaging the plurality of threads on the interior surface of the first cylindrical gear and a curved surface on a superior end wherein the curved surface comprises a pivot cylinder , the load head comprising a channel positioned on a bottom surface of the load head for receiving the curved surface of the pivot cylinder of the threaded rod . a base member including at least one of a pivot cylinder and a hinge channel ; a top member including at least one of a pivot cylinder and a hinge channel , wherein the at least one pivot cylinder of the base member engages the at least one hinge channel of the top member and the at least one pivot cylinder of the top member engages the at least one hinge channel of the base member ; and at least one movement mechanism engaging the top member and the base member , the at least one movement mechanism comprising: a first expansion assembly having a first cylindrical gear , a first threaded rod , and a first load head , the first cylindrical gear comprising a plurality of depressions on an exterior surface of the first cylindrical gear and a plurality of threads on an interior surface, the first threaded rod comprising a plurality of threads on an exterior surface of the first threaded rod for engaging the plurality of threads on the interior surface of the first cylindrical gear and a curved surface on a superior end wherein the curved surface comprises a pivot cylinder , the load head comprising a channel positioned on a bottom surface of the load head for receiving the curved surface of the pivot cylinder of the threaded rod . a first expansion assembly having a first cylindrical gear , a first threaded rod , and a first load head , the first cylindrical gear comprising a plurality of depressions on an exterior surface of the first cylindrical gear and a plurality of threads on an interior surface, the first threaded rod comprising a plurality of threads on an exterior surface of the first threaded rod for engaging the plurality of threads on the interior surface of the first cylindrical gear and a curved surface on a superior end wherein the curved surface comprises a pivot cylinder , the load head comprising a channel positioned on a bottom surface of the load head for receiving the curved surface of the pivot cylinder of the threaded rod . <EOS>