Jefferson missed the majority of the 2004–05 regular season after rupturing a ligament in his left wrist, an injury he claimed occurred when Detroit Pistons guard Chauncey Billups purposely undercut him on a layup attempt during a game on December 27, 2004. Jefferson ended up missing 49 games, but returned to action for the first round of the playoffs against the Miami Heat. Prior to suffering the injury, he had missed only five games in his three NBA seasons. Jefferson had been enjoying his best professional season, averaging 22.2 points, 7.3 rebounds, and 4.0 assists per game. Through the 2005–06 season, Jefferson continued to perform at a high level and established himself as one of the NBA's most versatile players. On January 21, 2007, Jefferson decided to have ankle surgery. After missing around six weeks, he was back in the lineup. His absence proved to be a major setback for the struggling Nets, who surged back into playoff contention once Jefferson returned.