Knee pain is very common as it can be caused by lots of things, from arthritis to injury. The problem could be in the joints themselves, or indicate an issue with the tendons the cords that attach muscle to bone or ligaments which connect the thigh bone to the lower leg bones to stabilize the knee.
With a knee injury, you have to quite easily from running, dancing, or even just putting your foot down wrong, it affects many aspects of daily life and you are probably willing to do just about anything to speed the healing. If you have arthritis, it is unfortunately not curable and can bother you for the rest of your life.
