Hi guys/girls, Yesterday after i just finish my badminton session, I realize that my right knee got some numb and pain feel. and when I try to flex/bend it , it got some cracking sound. I think I've twisted my knee slightly or bad lunges. If I put my plam on the knee and then flex/bend it, I can feel something in my knee cap is actually 'moving' like something is clashing each other.. Not sure what is it, I applied some anti-inflammatory and counter-pain medicine on the knee last night before sleep and today I feel no pain at all. However, the clashing feel and cracking sound still exist althou no pain. Not comfortable thou because still got that cracking feelings Any advise please ?