All-Pro 49ers linebacker NaVorro Bowman underwent surgery Tuesday morning to repair a torn ACL in his left knee, a source confirmed.
Bowman posted a photo on his Instagram account that showed him in a hospital with the the caption, "Time for surgery."
The operation was conducted by renowned surgeon Dr. James Andrews in Pensacola, Fla. Andrews has been in constant contact with 49ers orthopedic surgeon Dr. Tim McAdams, a source said. The 49ers sent a member of their training staff to Florida to be with Bowman for the surgery.
Andrews has already conducted two ACL surgeries on high-profile NFL players this offseason. In early January he performed an operation on New England tight end Rob Gronkowski one day after surgery on Denver's Von Miller.
His most notable surgeries in recent years have been ACL repairs on Minnesota running back Adrian Peterson and Washington quarterback Robert Griffin III.
Bowman sustained torn anterior-cruciate and medial-collateral ligaments in his left knee in the 49ers’ loss to the Seattle Seahawks in the NFC Championship game.
Two days later, 49ers coach Jim Harbaugh said Bowman would undergo surgery in two or three weeks after the MCL had time to heal. The MCL does not require surgery.
There is no timetable on Bowman’s return. It’s possible – but certainly not guaranteed – that he could be available for the start of the regular season.