A spinal surgery modeling system comprising: a spinal construct comprising: a plurality of screws; and an adjustable rod including a center member and first and second end members, at least one of the first and second end members including a first segment slidably engagable with an interior surface of the center member, and a second segment including a connecting portion securable to at least one screw of the plurality of screws; a spine model including vertebral bodies defining disc spaces between adjacent vertebral bodies, the spinal construct placed on the vertebral bodies of the spine model; and a spine movement device including: a plurality of cylinders, each cylinder of the plurality of cylinders including an elongate body defining a bore, the elongate body including an inlet and an outlet; a plurality of pistons, each piston of the plurality of pistons including an elongate body having a proximal end and a distal end, the distal end of each piston extending into the inlet and frictionally engaging the bore of one cylinder of the plurality of cylinders; and a plurality of inflation members, each inflation member of the plurality of inflation members disposed within one of the disc spaces of the spine model and fluidly coupled to the outlet of one cylinder of the plurality of cylinders; wherein the plurality of pistons are movable with respect to the plurality of cylinders to hydraulically inflate or deflate the plurality of inflation members. a spinal construct comprising: a plurality of screws; and an adjustable rod including a center member and first and second end members, at least one of the first and second end members including a first segment slidably engagable with an interior surface of the center member, and a second segment including a connecting portion securable to at least one screw of the plurality of screws; a plurality of screws; and an adjustable rod including a center member and first and second end members, at least one of the first and second end members including a first segment slidably engagable with an interior surface of the center member, and a second segment including a connecting portion securable to at least one screw of the plurality of screws; a spine model including vertebral bodies defining disc spaces between adjacent vertebral bodies, the spinal construct placed on the vertebral bodies of the spine model; and a spine movement device including: a plurality of cylinders, each cylinder of the plurality of cylinders including an elongate body defining a bore, the elongate body including an inlet and an outlet; a plurality of pistons, each piston of the plurality of pistons including an elongate body having a proximal end and a distal end, the distal end of each piston extending into the inlet and frictionally engaging the bore of one cylinder of the plurality of cylinders; and a plurality of inflation members, each inflation member of the plurality of inflation members disposed within one of the disc spaces of the spine model and fluidly coupled to the outlet of one cylinder of the plurality of cylinders; wherein the plurality of pistons are movable with respect to the plurality of cylinders to hydraulically inflate or deflate the plurality of inflation members. a plurality of cylinders, each cylinder of the plurality of cylinders including an elongate body defining a bore, the elongate body including an inlet and an outlet; a plurality of pistons, each piston of the plurality of pistons including an elongate body having a proximal end and a distal end, the distal end of each piston extending into the inlet and frictionally engaging the bore of one cylinder of the plurality of cylinders; and a plurality of inflation members, each inflation member of the plurality of inflation members disposed within one of the disc spaces of the spine model and fluidly coupled to the outlet of one cylinder of the plurality of cylinders;