A month later, Brady has his knee surgery

Patriots quarterback Tom Brady underwent surgery to repair his injured left knee Monday at the Kerlan-Jobe Orthopaedic Clinic in Los Angeles, NFL sources said. One source indicated that the procedure went well.

Brady's surgery took place 29 days after he was injured in the Patriots' 17-10 season-opening win over the Chiefs. Multiple sources told the Globe that Brady tore the anterior cruciate ligament and medial collateral ligament in his knee when hit by Kansas City safety Bernard Pollard.

In cases similar to Brady's, doctors often wait for the MCL to heal before reconstructing the ACL. That is typically a four- to six-week window, so Brady is closer to the early side.

Brady had chosen Neal S. ElAttrache, a well-known orthopedist specializing in sports medicine, shoulders, elbows, and knees, to perform the surgery. ElAttrache, through an assistant in his office, said yesterday that he could not comment on the procedure.

While not aware of the specifics of Brady's procedure, Michael Gordon, team orthopedic physician for the NBA's Milwaukee Bucks and Marquette University, estimated that the quarterback should expect a recovery time of about 6-8 months, assuming there were no other injuries.

Gordon said it is common for those who undergo ACL reconstructions to begin rehabilitation the day of the surgery. The initial rehabilitation would include "basic exercises to begin strengthening thigh muscles and decrease the swelling."

Shira Springer of the Globe staff contributed to this report