Andrew Bynum may undergo exploratory surgery on his troublesome left knee if he does not feel any relief in the next 3-4 weeks, Mike Bresnahan of the L.A. Times is reporting.

The injury has kept the Lakers' big man out of uniform since January 13.

Bynum had a medical consultation with Steven Gecha on Wednesday in Princeton, N.J., his second trip in the last few weeks to see an East Coast doctor.

"I'm not surprised about it," Lakers' Coach Phil Jackson said of the most recent medical update. "He was making progress and then he hit a wall and was experiencing continual swelling and backed off from that."

"Andrew was feeling better, and I think that's why the doctor said, 'Let's wait another three weeks or so to see how this goes because it's still a little bit touch and go.' "