The Cleveland Cavaliers have signed free agent forward Leon Powe to a two-year contract. Powe, who averaged 7.7 points and 4.9 rebounds in 70 games with the Boston Celtics last season, tore the ACL in his left knee during the playoffs and had reconstructive surgery on May 5. He isn't expected to be ready to play for the Cavaliers until February. Powe spent his first three seasons with the Celtics.