UFC 151 was scheduled for September 1, 2012, with light heavyweight champion Jon Jones defending against Dan Henderson. On August 23, UFC president Dana White announced that Henderson had suffered a partial rupture of his medial collateral ligament and could not compete. The UFC attempted to save the card by offering Jones a replacement opponent, Chael Sonnen, on only eight days' notice, effectively about three days once weight-cutting and promotional duties were considered. Jones declined after consulting coach Greg Jackson, who warned that Sonnen presented a completely different stylistic challenge and that the preparation window was unreasonable. White then announced that UFC 151 would be the first event in UFC history to be cancelled, publicly declaring that it would be remembered as the event Jones and Jackson had 'murdered.' The decision triggered an unusually bitter blame game: Jones was accused of abandoning the card, Henderson was criticized after it emerged that he had known about his injury for roughly three weeks, and analysts argued that the UFC itself had built an undercard too weak to survive the loss of its headliner. Critics also said the promotion tried to pressure Jones by making him the face of the cancellation, even though the final decision belonged to UFC management. The episode became a landmark argument for fighter unionization and for the need to protect athletes from being forced into dangerous short-notice bouts.
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