The procedure was performed so the recovery could coincide with that of Sanders' right ankle sprain, Colts owner Jim Irsay said Thursday. Sanders is expected to be out for at least two more games.
"The feeling was the high ankle sprain would take longer [to recover from] than the scope," Irsay told the Indianapolis Star. "I think they just cleaned out a few things [in the knee]."
Sanders has missed 26 of 67 regular-season games since being selected in the second round of the 2004 draft. The reigning defensive player of the year, Sanders signed a five-year, $37.5 million contract in December that includes more than $20 million in guarantees.
"I knew when we did the contract that he's such a rare talent that you have to live a little bit with the possible injuries that come up," Irsay told the Star. "Bob is so combustible, so physical. He's so dynamic and such a rare individual.
"It's something you knew [was possible], but you know he might get on a lucky streak and go a year or two without having anything."