9. Rheumatoid Arthritis
Rheumatoid arthritis is an autoimmune disorder in which the body’s immune system attacks its own healthy joints and tissues. When rheumatoid arthritis invades the knee, it causes pain and inflammation within the joint and in the membrane that covers the knee joint. Signs of rheumatoid arthritis in the knee include pain, weakness, swelling, and redness. Not all risk factors for rheumatoid arthritis are within your control. However, the Arthritis Foundation states that you can decrease your risk of this disease by avoiding smoking and maintaining a healthy weight.
This form of arthritis differs from rheumatoid arthritis in that it is caused by wear and tear or friction on the joint rather than by an autoimmune disease. Osteoarthritis is a degenerative condition in which the cartilage between the bones in the knee joint begins to erode away. This causes painful friction between the bones of the knee. You can help prevent the risk of wear and tear on your knees by keeping a healthy body weight and strengthening the muscles of your legs through exercise. Furthermore, avoid repetitive movements that can wear away the cartilage between your joints.
Patellar tendinitis, or jumper’s knee, occurs when you injure the tendon that connects your kneecap to your shinbone. This injury most frequently occurs in athletes who engage in sports like basketball that require a lot of jumping. According to the Mayo Clinic, jumper’s knee can be prevented by engaging in exercises that strengthen your leg muscles to decrease strain on the knee joint. If you experience patellar tendinitis, allow your joint time to recover by resting and applying ice. Learning and using proper jumping techniques can also decrease your risk of this painful condition.