The Phillies placed Hernandez on the 10-day disabled list Sunday and he will have an MRI exam on Monday in Philadelphia. Howie Kendrick, who just spent six weeks on the DL with a similar injury, started at second base in Sunday's series finale against the Cardinals at Busch Stadium. Phillies manager Pete Mackanin said he isn't sure if Kendrick will be the primary second baseman while Hernandez is out. Kendrick has played 1,113 of his 1,365 career games at second.
The Phillies activated right-hander Joaquin Benoit to take Hernandez's place on the 25-man roster.