Former President George W. Bush went under the knife.
FOX News Radio's Pat O'Neill has more on how the surgery went:
President George W. Bush had his left knee partially replaced last weekend at Rush University Medical Center in Chicago. The President had a partial replacement of his right knee over the Memorial Day weekend at the same facility-- both operations as outpatient procedures. The President gave up jogging in 2004, because of knee problems and started mountain biking. Officials say he's looking forward to getting back on the bike in a few weeks.
Pat O'Neill, FOX News Radio.