The first cause, tendonitis of the quadriceps muscle, can be caused by the following reasons: the quadriceps muscle due to long-term chronic walking of the knee, or chronic sports injuries, and lead to chronic inflammation of the quadriceps muscle, there can be symptoms of pain when the quadriceps muscle is exerted. The second cause, osteoarthritis, can lead to osteophytes above the patella in severe cases, which can be accompanied by damage to the quadriceps tendon, resulting in pain above the knee when force is applied. In this case, it is necessary to check the X-ray of the knee joint as well as CT and, if necessary, MRI of the knee joint for diagnosis, early oral medication as well as rest, physical therapy and closure therapy.