Common knee problems: 1. There is a “pop” sound when the knee is flexed and extended, but there is no other discomfort when walking, squatting, or going up and down stairs. A: This is mostly a physiological popping sound. It is characterized by a crisp, single, non-repetitive sound. It occurs only when the joint is suddenly strained or flexed. There must be a period of rest for the joint between the two popping sounds. There is a slight pain or discomfort and often a sense of relief after the ringing. However, if the popping is accompanied by significant knee pain, the pain increases when squatting up and down, or if the knee joint is restricted in flexion and extension when moving, the symptoms of stuck interlocking, it is time to go to the hospital for an MRI examination. 2, young and middle-aged people, after strenuous exercise, or climbing mountains, knee pain and swelling. A: Mostly synovitis of the knee. If the pain is short, you can first fix the knee brace for a week to avoid putting weight on the ground, and if the symptoms are relieved in the second week, you can gradually resume activities on the ground, while taking oral Cilobal and Ambitin. If there is no significant relief after more than three to four weeks of conservative treatment, an MRI is recommended to rule out meniscal or cruciate ligament injury. 3. In the young and middle-aged population, there is chronic knee pain, which is aggravated when squatting and going up and down stairs, and the pain is often concentrated in a specific part of the knee joint. The knee joint sometimes has a popping sound, or even suddenly gets stuck (interlocked) and cannot move. A: This is a serious knee sign and symptom, often suggesting meniscal rupture, cruciate ligament injury, synovial crepitus, joint free bodies, etc. An MRI is required and if there is a problem it may require arthroscopic surgery. 4. The knee joint is significantly painful and swollen after trauma. A: This patient should have an early MRI. If there is significant ligament rupture, early arthroscopic surgical treatment may be required. If there is only a degree III or greater meniscal injury or tear you can wait until the swelling in the knee joint has subsided (3-4 weeks) for arthroscopic surgery. If there is only a degree I or II injury to the meniscus, or a mild ligament injury, it can be treated conservatively first. In the acute phase after trauma, the knee joint should be immobilized in a brace for 2-4 weeks depending on the situation, avoid putting weight on the ground, and take oral blood-activating drugs and non-steroidal anti-inflammatory painkillers. 5. Pain in multiple joints throughout the body, with little correlation between pain and movement, or even more pronounced at night. Knee pain may be accompanied by swelling, localized skin redness and increased skin temperature. A: This kind of patient mostly has inflammatory pain, i.e. rheumatism, rheumatoid, gout and other diseases are more likely. If the history of the disease is long, you should go to the hospital when the symptoms are most serious to take pictures and draw blood for examination. Blood is drawn for: rheumatoid factor, anti-O, rheumatoid complete set, blood uric acid, blood sedimentation, CRP. then the diagnosis and treatment are determined according to the test results. Young patients should also check HLA-B27 to exclude ankylosing spondylitis. 6. Elderly people, mostly women, have pain in the knee joint when walking, and the pain increases when going up or down stairs, or when sitting and suddenly standing. When lying or sitting, the pain is reduced when the knee joint does not bear weight. Some patients have bilateral knee pain, mostly alternating with each other, for a few months or even a cycle of one or two years. A: Most of these patients have degeneration of the knee joint, also called osteoarthritis. It is very common in older women, most of whom start to have symptoms in their 50s and then gradually worsen, reaching a peak of symptoms around age 70. Early treatment is usually conservative, wearing a knee brace when pain is significant, minimizing lower limb activity, taking oral Cilobal and Advil, applying topical Zephyr, and also considering joint cavity injections of sodium vitrate (one injection per week for five weeks). Normal activities should be maintained when the pain subsides and walking on flat surfaces is not restricted. When symptoms severely affect daily activities, medication is not effective, or complete dependence on medication cannot be stopped, surgical treatment should be considered to improve the quality of life and prolong the life of the elderly. Daily health care: You can take oral glucosamine and chondroitin sulfate, avoid climbing hills and buildings, walk on flat roads, and the recommended forms of exercise are swimming and cycling. Take annual standing x-rays of the knee joint to detect the degree of knee degeneration.