Every couple years, Bill’s knee goes out on him.  The last time it happened we were at his brother’s wedding.  It has happened again.  This time it happened at my family reunion while he was batting playing baseball.  According to him, his knee sounded like all of your fingers cracking at once when he popped it.  It is been in pain since.  I keep telling him that I think he needs to go to the doctor.  Since I know nothing about knees, I thought I’d ask all of you.

Does this sound serious?  He is worried about needing surgery on it, so he is not real keen on going to get it looked at.  I am concerned and think he should go to the doctor.