The degeneration of the meniscus is equivalent to the wear and tear of a machine. As the body ages, the degeneration accelerates, and at about 30 years of age the meniscus enters a relatively rapid degeneration process. You should pay attention to protecting the knee joint, keeping it warm and not getting cold, and warming up properly when exercising to avoid meniscal damage due to sudden activity. It is important to keep the knee joint warm after the activity is completed, as getting cold can lead to the accumulation of metabolic products and accelerate the degeneration of the meniscus, and it is also important to avoid joint torsion in the semi-flexed position, which is the most serious damage to the meniscus.