in the annulus; [0033]FIG. 11C shows the hoop expanded within a disc space; [0034]FIG. 12A illustrates a different embodiment wherein a bag containing nucleus or synthetic materials such as hydrogel are inserted into a previously implanted hoop; [0035]FIG. 12B is a drawing that shows a second step associated with the procedure of FIG. 12A; [0036]FIG. 12C shows the way in which intradiscal material