Andre Berto has shoulder surgery

Former two-time welterweight titleholder Andre Berto underwent shoulder surgery on Wednesday in Los Angeles.

During the 3½-hour procedure, Dr. Neal ElAttrache repaired a ruptured subscapularis tendon in Berto's right shoulder. ElAttrache discovered that Berto had completely torn the tendon from top to bottom.

Berto fought most of the fight with the injury, using primarily his left hand but knocked Soto Karass down in the 11th round before Soto Karass stopped him in the 12th, handing Berto his third loss in four fights.

Berto (28-3, 22 KOs), 29, of Winter Haven, Fla., will go through approximately six weeks of rehabilitation and could resume boxing in as little as four months.

"I am happy to have the surgery behind me and hear that everything went well," Berto said in a statement. "I'm going to rest up and focus all my energy on my recovery so that I can return to the ring full force in 2014."

When Berto tore a biceps in 2012, ElAttrache assisted on that surgery.