The Oklahoma City Thunder announced on Tuesday that point guard Russel Westbrook still recovering from surgery last spring to repair a torn meniscus underwent arthroscopic knee surgery to reduce swelling and will miss 4-6 weeks for recovery. From the Thunder press release:

Oklahoma City Thunder guard Russell Westbrook underwent successful arthroscopic surgery on his right knee earlier today Thunder Executive Vice President and General Manager Sam Presti announced.

“Russell has been incredible in his work and rehabilitation. He has been pain-free and has performed at a high level during practice but has experienced recent swelling that had not subsided” said Presti. “After careful consideration and recommendations from the medical team we elected to do the procedure today based on our consulting physician's belief that the swelling would be alleviated and in turn give Russell the best chance for sustained performance throughout the season and beyond. During the procedure it was determined that the source of swelling was due to a loose stitch and fortunately we were also able to confirm that the meniscus has healed properly.”