 During his match with The Undertaker, Shawn Michaels suffered a severe back injury when he took a back body drop off of the casket, landing on his tailbone on the casket's outer mid-section.He herniated two discs in his back and crushed a third, and the injury forced him to retire from wrestling after WrestleMania.As it transpired, during a one-off match with Triple H at SummerSlam 2002, he realized his back no longer hampered him and made a full-time return to wrestling.