Everytime im in a cold room or outside in cold weather, my right knee feels cold inside and numb. It's not a sharp pain, it's more dull but aching and annoying when I try to sleep or play sports. I used to play volleyball in high school and fell on my knees alot, but hardly iced my bruised knees afterwards. I would just let time heal it. I asked the school nurse about it and she assessed my knee if it was filled with fluids, but she said there wasn't any. She was curious as to why my knee caps feel loose, cause I can voluntarily move and crack them. Wondering if anyone knows what could be wrong?