Patient: I have exercised before, the amount is relatively large, the outer side of the second knee joint feels pain, not very strong, but squatting to an angle of about 120 degrees when the second knee is weak, the angle is almost to about 60 degrees and good, usually playing tennis, badminton, running is very difficult, when starting, weak and soft, please ask the doctor, how to treat good? I consider the degenerative disease of the knee joint, that is, the aging of the joint, do not need to be nervous, this is the normal law of life changes, as people get old hair will become gray, aging eyes, action is not as agile as when young, we need to pay attention to the care of our joints, just like the car engine, need to maintain, therefore, do not need to be nervous, just like someone said you have long gray hair, you will care, but in daily life and work to pay attention to: one, do not be afraid of the work of the joint. In daily life and work to pay attention to: a. Do not or reduce the number of up and down the stairs, do not go climbing or climbing, do not go squatting horse stance, these are accelerating the wear and tear of the knee joint, such as exercise can go swimming or jogging on flat ground, do not squat frequently. Second, the knee joint to reduce trauma or cold. Do not have a large or strenuous activity. Third, you can take some oral drugs to protect the knee cartilage, such as glucose capsules, glucosamine sulfate capsules, etc., and some anti-inflammatory and pain-relieving drugs such as Fotarim, Fenbid, etc.