Bourque proved a solid force for Boston for 21 seasons (1979–2000), famous for combining offensive prowess at a level that few defencemen in league history had ever achieved—he was a perennial shot accuracy champion at All-Star Games—and near-unparalleled defensive excellence. Bourque won five Norris Trophies as the league's top defenceman and finished second to Mark Messier in 1990 in the closest race ever for the Hart Memorial Trophy, the league's Most Valuable Player award. The Bruins' reliance on Bourque's on-ice mastery was so total that—while Bourque was very durable throughout much of his career—the team was seen by many to flounder whenever he was out of the lineup.