Quadriceps tendonitis refers to the aseptic inflammatory reaction of the quadriceps tendon caused by long-term strain, trauma and other factors, resulting in pain, activity limitation and other symptoms. Quadriceps tendonitis can be caused by many factors, including external factors, such as long-term strain, trauma, strenuous exercise, etc. Usually, it is pain in front of the knee, which can be relieved after resting, and when the inflammation is severe, it can lead to swelling of the knee joint and limitation of activities. Quadriceps tendonitis can be diagnosed with the help of MRI examination of the knee joint and then treated accordingly, such as local rest, braking, or some localized heat therapy or intermediate frequency electrotherapy and other physiotherapy, and can also be localized massage, and when the pain is significant, it can be treated with oral non-steroidal anti-inflammatory drugs such as bisacodyl, and the drugs need to be taken under the guidance of a doctor.