Your knee pain may be due to chronic swelling or inflammation in the joint – most often referred to as arthritis. Below are common forms of arthritis associated with knee pain.
With osteoarthritis, the cushioning cartilage at the end of the femur may have worn down, making walking painful as bone rubs against bone.
With rheumatoid arthritis, sometimes called inflammatory arthritis, a person’s immune system attacks the joints with uncontrolled inflammation, potentially causing joint erosion.
With post-traumatic arthritis, a less common form of arthritis, a broken or fractured bone extends into the joint space, causing the surface to become uneven. Over time, friction causes the joint to break down and become arthritic