In his monthly newsletter on tigerwoods.com, the world's No. 1 said he was finally off crutches and in a knee brace, but still uncertain of when he will return to action.
'Needless to say, I'm a little stir crazy since my knee surgery on April 15. Although I've been through this before and understand the need for patience, I don't enjoy sitting around,' he said.
'I really don't have a timetable for returning to competition. The doctors have said I should be able to play again in four-to-six weeks, but nothing is certain. I'm just going to do what they tell me to do.'
Woods will miss his title defense in next week's Wachovia Championship and will not compete in the following week's PLAYERS Championship. He will likely miss the Memorial Tournament, too, but is hoping to return at the U.S. Open June 12-15.
This was the third time Woods had sugery on his left knee, having previously done so in 2002 and 1994.
Woods said that he knew for a while that he was going to have to go back under the knife and decided to wait until after the Masters Tournament to do so.
'I knew a couple of months ago I was going to have the surgery. The knee has been bugging me for a while. The only decision was do you miss the Masters or play in the Masters? I decided to play. Even if I had won, I still would have had the surgery,' he said.
Woods finished runner-up to Trevor Immleman at the Masters. He didn't blame his loss on his knee, but rather a balky putter.
'I've definitely been playing in pain, but that's not why I didn't win at Augusta. I just never got comfortable with my putting stroke. As I said after the tournament, I was dragging the putter coming through which meant I couldn't start the ball on line. That's all it takes on those greens. Obviously, it was frustrating because I hit the ball well enough to win. It was just one of those things,' said the 4-time Masters champion.
Woods added that he called Immelman a couple of days after the event and left him a message congratulating him on his maiden major triumph.
Woods recently hosted Tiger Jam XI in Las Vegas, in which he raised $1.5 million for his Tiger Woods Foundation.