CHICAGO (CBS) — Former President George W. Bush was in Chicago over the Memorial Day weekend for outpatient knee replacement surgery at Rush University Medical Center.

Bush spokesman Freddy Ford said the former president had a successful partial knee replacement on Saturday. He flew back to Dallas on Monday and was recovering at home.

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It was unclear which knee Bush had replaced.

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Bush stayed at the Peninsula Hotel on Michgan Avenue after the surgery, before flying home on Monday.

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Rush is considered one of the nation’s best hospitals for orthopedic surgery, and is the same hospital where Bulls star Derrick Rose had knee surgery in May 2012 after he suffered a torn ACL in his left knee, and also after he suffered a torn medial meniscus in his right knee last November.