Penn State running back Stephfon Green underwent successful surgery on his right ankle Tuesday.

The redshirt freshman dislocated his right ankle during the fourth quarter of the Rose Bowl according to Dr. Wayne Sebastianelli, Penn State's Director of Athletic Medicine.

Sebastianelli said rehabilitation will take approximately three-to-four months, meaning Green will miss spring practice.

Running back Evan Royster and offensive tackle Dennis Landolt, however, will not miss spring practice after injuring their knees against USC, according to Sebastianelli.