Due to constant wear and tear of the knee joint, pain can originate in any of the bony structures compromising the knee joint (femur, tibia and fibula), the kneecap (patella) or the ligaments and cartilage (meniscus).
Pain in the knees can be caused by weakened bone structure and wear and tear due to aging. Other common causes include fractures, ligament injuries, meniscus injuries, dislocation of the knee joint and stiffness in the joint due to arthritis, lupus and other chronic ailments.