PHILADELPHIA -- The Philadelphia 76ers activated forward Monty Williams and put center Todd MacCulloch on the injured list Wednesday.

Williams, who played in four games this season, missed the first 18 contests after having arthroscopic surgery on his left knee Oct. 25. He bruised his left knee against Seattle on Dec. 11 and was placed on the injured list four days later.

Williams had exploratory surgery on his left knee Jan. 24 which didn't reveal additional damage.

MacCulloch was placed on the injured list because of a condition affecting both feet. He has played 42 games and started 35. He was averaging 7.1 points and 4.7 rebounds.