My 9 yr old daughter's knee keeps locking up, if she has been sitting on the floor or goes to get up from a chair quickly her knee seems to pop out and is really painful. She used to just sit and cry but now knows that if she straightens her leg out really quickly it pops back into place again.
This happens fairly regularly about 3 or 4 times a week, or sometimes more than this.
I would take her to the doctors but they are notoriously bad and I just have the feeling they are going to look at me as if I'm being pfb about it!
She is very active, average height for her age and quite skinny.