A simulation device for simulating a position of a replica human spine due to different pathologies and different surgical positions, the simulation device comprising: a base portion including at least a first upright member and a second upright member, the first and second upright members (22, 24) being spaced apart a first distance; a carrier portion rotatably attached to the base portion, the carrier portion including at least a first arm portion, a second arm portion, and a cradle portion attached between the first and second arm portions (36, 38); the first arm portion being rotatably attached to the first upright member, the second arm portion being rotatably attached to the second upright member, and the first and second arm portions (36, 38) rotating about a rotational axis, the cradle portion including at least a longitudinal member extending approximately the first distance, and the longitudinal member being substantially aligned with the rotational axis; the longitudinal member supporting at least a first adjuster and a second adjuster for positioning and repositioning portions of the replica human spine; characterized by: the first adjuster including a first adjustment rod, a second adjustment rod, a first collar portion, a second collar portion, and a distal end portion for supporting a first portion of the replica human spine, the first adjustment rod extending outwardly from the longitudinal member, the first collar portion being movably attached to the first adjustment rod, the first and second collar portions (74, 76) being rotatably attached to one another, the second adjustment rod being movably attached to the second collar portion, and the distal end portion being attached to the second adjustment rod, wherein the first collar portion is movable via adjustment relative to the first adjustment rod in a first direction, and the second adjustment rod is movable via adjustment relative to the second collar portion in a second direction, the adjustment of the first adjuster affording positioning and repositioning of the distal end portion and the first portion of the replica human spine supported thereby; and the second adjuster including a first gear mechanism, a first rotatable shaft, and an armature portion for supporting a second portion of the replica human spine, the armature portion being attached to the first rotatable shaft, the first rotatable shaft being rotatably adjustable by the first gear mechanism, wherein the armature portion is moveable via adjustment of the first rotatable shaft, the adjustment of the second adjuster affording positioning and repositioning of the armature portion and second portion of the replica human spine supported thereby. a base portion including at least a first upright member and a second upright member, the first and second upright members (22, 24) being spaced apart a first distance; a carrier portion rotatably attached to the base portion, the carrier portion including at least a first arm portion, a second arm portion, and a cradle portion attached between the first and second arm portions (36, 38); the first arm portion being rotatably attached to the first upright member, the second arm portion being rotatably attached to the second upright member, and the first and second arm portions (36, 38) rotating about a rotational axis, the cradle portion including at least a longitudinal member extending approximately the first distance, and the longitudinal member being substantially aligned with the rotational axis; the longitudinal member supporting at least a first adjuster and a second adjuster for positioning and repositioning portions of the replica human spine; characterized by: the first adjuster including a first adjustment rod, a second adjustment rod, a first collar portion, a second collar portion, and a distal end portion for supporting a first portion of the replica human spine, the first adjustment rod extending outwardly from the longitudinal member, the first collar portion being movably attached to the first adjustment rod, the first and second collar portions (74, 76) being rotatably attached to one another, the second adjustment rod being movably attached to the second collar portion, and the distal end portion being attached to the second adjustment rod, wherein the first collar portion is movable via adjustment relative to the first adjustment rod in a first direction, and the second adjustment rod is movable via adjustment relative to the second collar portion in a second direction, the adjustment of the first adjuster affording positioning and repositioning of the distal end portion and the first portion of the replica human spine supported thereby; and the second adjuster including a first gear mechanism, a first rotatable shaft, and an armature portion for supporting a second portion of the replica human spine, the armature portion being attached to the first rotatable shaft, the first rotatable shaft being rotatably adjustable by the first gear mechanism, wherein the armature portion is moveable via adjustment of the first rotatable shaft, the adjustment of the second adjuster affording positioning and repositioning of the armature portion and second portion of the replica human spine supported thereby.