Johnson undergoes knee surgery, scheduled to return in January By Rex Hoggard Nov 29, 2011 1:43 PM ET .Dustin Johnson is at home in south Florida and recovering from surgery earlier today to repair cartilage in his right knee that had slowed him since July. According to Johnson's manager the surgery went well and he should be on crutches for about a week. He was scheduled to play this week's Chevron World Challenge, but withdrew. David Winkle, with Hambric Sports Management, said doctors have informed Johnson he should be able to begin chipping and putting by mid-December and begin full preparations for the 2012 season by late next month. Winkle said Johnson should be back on the PGA Tour by mid-January. "He was in the hands of an excellent surgeon (Dr. George Caldwell), and a full and speedy recovery is expected," said Winkle. Johnson struggled at the Presidents Cup, going 1-3-1.