While Stewart's first surgery was at an Iowa hospital, it only stabilized and cleaned the injury (making it likely that this was a compound fracture, in which the bone protruded through the skin, Google if you dare). The second surgery was conducted by a North Carolina specialist, who inserted a metal rod in the tibia (the larger of the two lower leg bones Stewart broke, located on the inside of the leg).
Max Papis is slated to run Stewart's number 14 Chevrolet at this weekend's Watkins Glen road race. As for the oval races Stewart will miss, a replacement has not been announced. USA Today also notes that this weekend will be the first race Stewart has missed since 1998, breaking a record that placed him third among active drivers.