Cases of chronic knee pain have increased a lot in the last 20 years As the knee is the main joint people use for walking, a good understanding of long-lasting knee pain can be important. Knee injuries are so common partly because of how complex the joint is. The knee is the joint where the thighbone, shinbone, and kneecap (patella) connect. In addition to these bones, the knee includes cartilage, ligaments, menisci and tendons.
Source: Medical News Today