Colts coach Tony Dungy confirmed Monday that Peyton Manning had a second surgery on his knee this offseason.Clearly, it is not a concern any longer, but this helps explain Manning's relatively slow start to the season. Manning's first surgery was to remove an inflamed bursa sac. There were rumors at the time that he developed an infection after the first surgery, which may have prompted the second. Manning threw for three touchdowns against the Ravens in Week 6. Source: Associated Press