Spondylolisthesis with stenosis is the case where decompressing is not enough: once there is room for the root, the spine has to be stabilised, and both happen in the same session.
Advanced Spondy Posterior reproduces that case from L3 to S1, with the spondylolisthesis at L4-L5 and the stenosis alongside it. Bone density and tissues are advanced simulation, and the same piece takes the open microscopic access, the tubular endoscopic one and the percutaneous one.
It belongs to the Advanced family, and that is where the difference lies: the dura opens and closes, bleeding is part of the procedure, and the field gets as dirty as it does in the room.
