On December 9, 2011, the Trail Blazers announced that Oden had suffered an unspecified "setback" that left them less optimistic about his ability to play in the 2011–2012 season. Rather than signing an 8.9-million-dollar qualifying offer, Oden and the team negotiated a different offer. On February 3, 2012, Oden underwent arthroscopic surgery on his right knee. On February 20, 2012, Oden was scheduled for a procedure on his left knee similar to the procedure he underwent 17 days earlier. However, during the operation, further damage to the articular cartilage was discovered, and Oden underwent his third micro-fracture surgery.