The patellar cartilage is normally like a smooth tarmac surface (of course, it actually looks like ceramic) and does not cause wear and tear on car tires. Now your cartilage may be like the surface of a road being crushed out by a large truck, and the car tires will wear each other out when they are pressed through, which in the actual human body means pain in the front of the knee joint when squatting, going up and down stairs, etc., and even a ringing sound. If your symptoms are similar to this, you can use my following advice to reference treatment to try. Treatment principles: 1, to avoid repetitive injury movements and aggravate the condition; 2, to enhance the body’s resistance to external damage; 3, reasonable drug-assisted treatment (mainly to provide nutrients to help the growth of cartilage and increase the degree of lubrication of the joint surface); 4, surgery when necessary (this needs to be confirmed by an experienced doctor according to the condition, and discussed with the patient and family before implementation) . In accordance with the above principles, to help you develop the following program: First, this injury will still aggravate, especially too much repetitive squatting and up and down the stairs, especially climbing, just like the already damaged road if you still let the big truck pressure, of course, will deteriorate rapidly. Then what to do? Of course, you need to prohibit large trucks, that is, to reduce the number of such movements, because these movements will multiply the weight of the knee joint. Second, exercise thigh (mainly refers to the quadriceps) muscle strength, because its enhancement, can significantly reduce the pressure in front of the knee joint (mainly refers to the patellofemoral joint), enhance the stability of the knee joint, the same can play a role in protecting the patellar cartilage. The main clinical methods are isometric and isotonic contractions of the quadriceps (which can be properly resistant). Third, long-term intermittent oral administration of drugs containing glucosamine or even chondroitin sulfate to supplement the main components needed for cartilage synthesis in the knee joint. Of course, the older the patient, the less effective such drugs will generally be, because the organism is also aging and its synthetic capacity is declining. However, clinical results show that most older people also have some effect. Fourth, intra-articular injections of hyaluronic acid-based drugs. This is also one of the cartilage components, but is more of an active component of normal joint fluid. In patients with cartilage damage, especially severe damage, such normal components in the joint are destroyed, so appropriate supplementation will have some effect. Of course, this is an invasive treatment, i.e. it requires a syringe needle to puncture into the joint and then inject the drug, which carries the risk of pain, allergy, bleeding, and even intra-articular infection, but the incidence is clinically low, especially when performed by an experienced physician. Of course, not every patient should be injected. My experience is that patients who have been treated with oral medications that are ineffective or even allergic, and who also do not have significant effusion in the knee joint and often feel stiff and astringent in the knee joint are more suitable.