If knee joint pain is accompanied by murmur, there are many reasons. The most common is meniscus injury of knee joint; The pathological changes of synovium, cartilage, ligament and tendon of knee joint may also lead to joint noise. For people who like to run and climb mountains, it is often accompanied by knee pain and noise. The most common reason is the pathological changes of patellofemoral joint, that is, the articular surface of patella and femur is worn and damaged, resulting in uneven articular surface, so it is manifested in the process of flexion and extension, squatting and so on, and the cartilage surface rubs and makes a sound. Some people will disappear after exercise, because after a period of exercise, joint synovial fluid secretion will increase, which will increase joint lubrication and noise will disappear.
From a physical point of view, the movement of joints is nothing more than sliding (such as the initial bending of the knee), rolling, grinding (rotation) and so on. , not divorced from the mechanical principle, due to friction and vibration naturally produce sound. Just because the joint cavity is tightly closed and the joint synovial fluid is effective and unobstructed, the sound is too small for us to hear. ? In fact, the sound emitted by the joints can be amplified by a microphone and sound waves can be recorded. Many years ago, the joint acoustic recorder was developed, which can be used to "listen" to knee joint lesions in clinic.
In fact, not only the hip and ankle joints, but also other muscle groups, such as gluteal muscles and gluteal flexors. Anything happens to them (such as not stretching, too tight), which will affect the knee joint. In a word, what happened to my body during exercise? My knees were involved and I was lying innocently.