My knee has been bothering me I can't bend on my left knee much at al withiught feeling pain on Like the center to the left of the knee it doesn't look swollen to me ... my trainer told me my knee goes in whenever I bend. It will sometimes lock up when I'm just sitting down and I'll have to try and rub it and stretch it, but it doesn't do much. It will hurt to push against something like when you leg press ! And I can't extend it out very well withought feeling pain.