An insertion instrument for inserting a modular intervertebral fusion device or components thereof (50, 60) into an intervertebral space, the insertion instrument comprising: a superior arm mounted on a superior support such that the superior arm extends from the superior support; and an inferior arm mounted on an inferior support such that the inferior arm extends from the inferior support, wherein the superior support and the inferior support are mechanically coupled to each other whereby: the superior arm and the inferior arm extend in generally a same direction such that, in use, each of the distal ends of the superior and inferior arms engage at a respective location on a modular intervertebral fusion device or component thereof; and the superior and inferior supports rotate relative to each other to provide relative rotation of the superior arm and the inferior arm, whereby there is movement together and apart of the superior arm and the inferior arm at their distal ends, wherein one of the superior arm and the inferior arm is unarticulated between its distal end and the respective one of the superior support and the inferior support, and wherein the other one of the superior arm and the inferior arm comprises a hinge between its distal end and the respective one of the superior support and the inferior support, the hinge rotating the distal end of the other one of the superior arm and the inferior arm towards or away from the one of the superior arm and the inferior arm, and wherein the insertion instrument comprises only one superior arm and only one inferior arm, the unarticulated one of the superior arm and the inferior arm immovably mounted on the respective one of the superior and inferior supports, the articulated one of the superior arm and the inferior arm comprises proximal and distal portions with the hinge therebetween, and the proximal portion is immovably mounted on the respective one of the superior and inferior supports (112, 114). a superior arm mounted on a superior support such that the superior arm extends from the superior support; and an inferior arm mounted on an inferior support such that the inferior arm extends from the inferior support, wherein the superior support and the inferior support are mechanically coupled to each other whereby: the superior arm and the inferior arm extend in generally a same direction such that, in use, each of the distal ends of the superior and inferior arms engage at a respective location on a modular intervertebral fusion device or component thereof; and the superior and inferior supports rotate relative to each other to provide relative rotation of the superior arm and the inferior arm, whereby there is movement together and apart of the superior arm and the inferior arm at their distal ends, wherein one of the superior arm and the inferior arm is unarticulated between its distal end and the respective one of the superior support and the inferior support, and wherein the other one of the superior arm and the inferior arm comprises a hinge between its distal end and the respective one of the superior support and the inferior support, the hinge rotating the distal end of the other one of the superior arm and the inferior arm towards or away from the one of the superior arm and the inferior arm, and wherein the insertion instrument comprises only one superior arm and only one inferior arm, the unarticulated one of the superior arm and the inferior arm immovably mounted on the respective one of the superior and inferior supports, the articulated one of the superior arm and the inferior arm comprises proximal and distal portions with the hinge therebetween, and the proximal portion is immovably mounted on the respective one of the superior and inferior supports (112, 114).