to perform a reverse piledriver on Austin, who later said that he was not sure if the move was a good idea to perform, as he was unsure if his head could properly be protected. As Austin had feared, Hart botched the move and dropped Austin on top of his head. The impact jammed Austin's neck and left him temporarily paralyzed. He continued and finished the match, but stayed away from the ring for two months to recover from the injury. The physical demands of Austin's standing as one of the top stars in the WWF did not allow much downtime for him to rest and take care of the injury, and as his career progressed, the damage got worse. Austin underwent surgery on his neck in 1999, but it never fully healed. By 2002, Austin's doctors told him that he risked permanent disability if he did not retire, and he finally did so in April 2003. The piledriver was banned in the World Wrestling Federation (WWF, now known as the WWE) in 2000, unless the wrestler has special permission to use the move. In a discussion in 2007, Stephanie McMahon said that only two wrestlers were allowed to use the move, "two of the stronger guys", Undertaker and Kane. In fact, The Undertaker's tombstone piledriver continued to be his finishing move until his retirement in late 2020. The piledriver is also banned in many other promotions and certain cities. It is also considered an automatic disqualification in professional wrestling matches held in Tennessee, as the move is banned in that state. In some promotions in the United Kingdom, the move can result in not only a disqualification, but also a fine. In Mexico, the piledriver (called a martinete) is an automatic disqualification. Because of the dangers of the piledriver, it is classed as a foul and is illegal in mixed martial arts under the Unified Rules of Mixed Martial Arts. Variations Aided piledriver Any double-team move in which one wrestler helps another to perform a piledriver on an opponent by pushing down on the opponent's legs for more impact. In a variation of the move, the second wrestler jumps off the turnbuckle while pushing the opponent's feet downward for even more damage; this is well known as a spike piledriver (not to be confused with a one-man spike piledriver). Argentine piledriver The move is executed from an Argentine backbreaker