It's a 12-game season for most Penn State football players but it's more like three or four games, best case, for Nittany Lions' senior guard Miles Dieffenbach.

Dieffenbach, a returning starter and a team leader, confirmed Saturday morning that the knee injury he suffered in spring was extensive and required surgery to repair a damaged anterior cruciate ligament (ACL).

"It was just a regular knee surgery, it wasn't too bad,'' Dieffenbach said prior to the start of Penn State football's 12th annual Lift for Life on the PSU lacrosse field.

Dieffenbach, a two-year starter, said the spring injury happened as a result of a collision with a teammate.

"Just on the field, it happens. Guy rolled up on me and it kinda happened,'' said the 6-3, 303-pound Dieffenbach, who is just one of two returning starters up front, the other being left tackle Donovan Smith.

Dieffenbach did not participate in any of the conditioning events at Lift for Life but was in attendance to root his teammates on. Other than running and leg-strengthening exercises, Dieffenbach hasn't been cleared for any other physical conditioning.