I have recently injured my knee with a frontal hit to the knee cap against a door. I had little pain and only a slight swelling the next day, but nothing too noticeable. However, every time I bend my leg now, I can hear (and feel) a soft grinding sound. I have had XRAY's done but everything was O.K.. Could this mean that I may have caused some damage to the knee cap, like the cartilage under it?
I have had a mosaicplasty done on this same knee before.
Thank you for your time.