Right-hander Livan Hernandez underwent successful arthroscopic surgery on his right knee Wednesday in Miami, The Washington Post reported. "He'll be at full strength for spring training," general manager Jim Bowden said. Hernandez, who went 15-10 with a 3.98 ERA, was bothered by the knee for more than four months, and it surely affected his performance. He lost some velocity off his fastball, and couldn't drive off the rubber to get a sharp break with his breaking ball. He went 12-3 with a 3.48 ERA before the All-Star break, 3-7 with a 4.58 ERA afterward.