49ers linebacker McKillop undergoes knee surgery

San Francisco linebacker Scott McKillop has undergone surgery on

his left knee to repair a torn patellar tendon and torn anterior

cruciate ligament.

McKillop, a backup inside linebacker who was hurt in Wednesday

afternoon’s practice, underwent surgery Friday morning at nearby

Stanford Medical Center.

The 49ers provided no timetable for his return, if he comes back

this season at all. He most likely will be placed on the

season-ending injured reserve list considering the severity and

healing time for the injury. Recovery for both injuries is

typically six to nine months.

McKillop, a fifth-round draft pick last year out of Pittsburgh,

played all 16 games as a rookie in 2009, primarily on special

teams.