PORT ARTHUR — Dr. James Andrews, who is pretty much the go-to surgeon for knee and shoulder work on sports stars, performed surgery on Memorial ex Jamaal Charles’ left knee Thursday in Pensacola, Fla. Early word is that the knee wasn’t damaged as badly as first believed, and that with proper rehab Charles should be full speed well before the 2012 NFL season kicks off. Jamaal will be spending the next two weeks in Pensacola, then go to Kansas City to do his heavy rehabbing at the Kansas City Chiefs facilities. Andrews, incidentally, has reportedly done over 40,000 knee, elbow and shoulder surgeries on a clientele that includes the likes of Drew Brees, Troy Aikman, Emmitt Smith, Roger Clemens, Bo Jackson, Michael Jordan, Jack Nicklaus and Charles Barkley .