My right knee started hurting. I have patella tendinitis and patella pain syndrome which I found out February. I did phyical therpy February to September. Then home exercises October and still doing them. My knee poppes and sometimes it locks up. It started tingling today after bowling. It also swelled after school and a lot of walking. Last week my bowling ball also hit my knee a little. It snapped during bowling today when I was picking up my ball from the ball return. I can move my kneecap a little. My hip on that leg is also underdeveloped from hip surgery when I was 8 years old.