SAN FRANCISCO — Golden State Warriors guard Jimmy Butler underwent right knee surgery Monday for his torn anterior cruciate ligament, an injury that ended his season last month. The surgery was performed by Dr. Bert Mandelbaum in Los Angeles, and the team said he would begin a rehabilitation program immediately with an update on his progress expected early next season. READ: NBA: Warriors prepare to go forward without Jimmy Butler Coach Steve Kerr hadn’t spoken with Butler, who will be immobilized for some time before he is able to rejoin the team and likely watch from the bench before season’s […]... Keep on reading: NBA: Warriors star Jimmy Butler undergoes right knee surgery