Health is the most important asset in life, and the popular trend of orthopedic diseases has made more and more people start to pay attention to this “most important asset”. Recently, many patients have asked – what is the cause of knee pain when going up and down stairs? There are many causes of knee pain, but according to the cases seen, the majority of patients have osteophytes in the knee joint. Osteomalacia is a common disease that occurs mostly in middle-aged and elderly people. It is a degenerative change in the bones and joints, a defensive reaction of the body to adapt to changes in force and maintain the internal and external balance of the joints, and a physiological compensatory change. If the bone mass compresses the surrounding nerves, blood vessels and other tissues and affects the joint activities, the corresponding clinical symptoms will appear, which is called osteophyte disease or osteophyte disorder. Knee osteophytes: Swelling and pain in the knee joint may occur, aggravated when squatting or walking up and down stairs, or narrowing of the knee joint gap may be found on radiographs, collectively referred to as degenerative knee joint disease or osteoarthritis. Symptoms of osteophytes of the knee: 1. At the beginning of osteophytes of the knee, the pain is either accompanied by numbness, joint popping, joint extension and flexion dysfunction when walking, jogging, going up and down stairs, standing for a long time, squatting, running, or relieved after rest. 2, there is sustainable hidden pain, the pain increases when the weather is cold or wet, and the knee joint pain numbness and stiffness when getting up in the morning or when sitting for a long time, but improves after a little activity. In severe cases, swelling of the knee joint, joint effusion, morning stiffness and gluing after sitting for a long time, joint extension and flexion dysfunction, limping, functional limitation, popping sound in extension and flexion activities, knee symptoms are aggravated when going down steps or standing for a long time, some patients can see joint effusion, obvious local swelling and compression, the knee in which there is an anterior medial strip-like mass with knee extension dysfunction, bone superfluous formation around the knee joint, joint periphery There is osteoporosis and osteosclerosis around the joint. The joint surface is rough and uneven, with significant involvement of the medial tibiofemoral joint surface and narrowing of the joint space. Most of them have medial gap narrowing and patellar spur formation.