What happens to the knee to cause it to become unstable or arthritic?
Our knees absorb quite a bit of shock over the course of our lifetimes and can begin to show wear and tear on the surface of bone and in the cartilage that sits between bones. Some medical conditions — inflammation or rheumatoid arthritis — also can cause this same type of degeneration. Additionally, direct injury to the knee joint from contact sports or accidents can destabilize the knee and cause uneven wear, eventually leading to arthritis later in life.
