Butler averaged 15 points and 4.1 rebounds in 29 games last season before having knee surgery.
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Also, Amare Stoudemire's status for the postseason is unclear as he recovers from right knee surgery.
Joey Votto was still one tough out when he returned last season following left knee surgery.
After undergoing arthroscopic knee surgery this past winter, his numbers have been sub-par thus far.
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But he refused to comment further on how his recovery following knee surgery was coming along.
Closer Mariano Rivera, coming off knee surgery, will take part in his second simulated game.
But, after undergoing knee surgery in March, he has struggled to find his form and fitness.
Yankees closer Mariano Rivera (right knee surgery) said he will throw his second simulated game Sunday.
He'd just had knee surgery so his days as a factory supervisor were numbered.
Canty missed the first six games of last season after having offseason knee surgery.
But that production slowed in the weeks before he opted to receive arthroscopic knee surgery.
Saeed is now fully fit following knee surgery but believes the injury was a "blessing in disguise".
Yankees closer Mariano Rivera, coming back from knee surgery last year, threw his second consecutive 1-2-3 inning.
McGinley, 39, had knee surgery last week after pulling out of the Irish Open at Carton House.
In 2009, she underwent major knee surgery for arthritis and had to take off a year to recover.
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After all, he had major knee surgery just five months ago after he tripped and tore a tendon.
Shumpert, who returned from knee surgery last month, remains a work in progress, and a favorite of Woodson.
The 20-year-old forward was on the bench for the first time this season against Burton after knee surgery.
The Vikings are coming off a three win season, and AP is coming off a crazy knee surgery.
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Notes: Amare Stoudemire still hopes to return from right knee surgery for the second round if the Knicks advance.
Westbrook was injured in Game 2 and had season-ending right knee surgery Saturday.
The best performers included Mako Surgical, which makes a less-invasive knee surgery procedure, was the best-performing stock in August.
He underwent knee surgery in 2008, then elbow surgery in 2009, all leading up to the 2010 shoulder operation.
The diagnosis for his recovery from knee surgery is a mere six weeks.
She had undergone a state-of-the-art knee surgery after it deteriorated following the 2008 Games and spent two years recovering.
Mitchell likely won't play for Los Angeles this season after undergoing knee surgery.
Rivera, coming back from knee surgery, could pitch in his first game Saturday.
Woods subsequently won his 14th major at Torrey Pines before undergoing reconstructive knee surgery which sidelined him for nine months.
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