Knee joint noise in walking mainly refers to the noise caused by abnormal friction and impact when the knee joint is moving. Friction and impact are common due to the degeneration and proliferation of knee joint bone, wear and peeling of articular cartilage, proliferation, hypertrophy and calcification of soft tissue around the joint, as well as inflammation of synovium in the joint and reduction of synovial fluid in the joint, which can cause abnormal friction and impact during activities. For example, when the bone of the knee joint degenerates and proliferates, it is possible to produce collision and friction between the hyperosteogeny bone during the bone activity. Hyperosteogeny and degeneration also lead to the ligaments and joint capsules attached to it, and friction and collision between the hyperosteogeny bone and the bone during the activity. In addition, because the cartilage between the joints is worn and peeled off, the contact surface of the cartilage is not flat, and the friction and impact generated during the movement can cause the joint to sound when walking. Common causes include knee trauma, strain, inflammation, knee degeneration, and even knee tumors, which will lead to changes in the structure around the knee and the structure of the joint itself. During the activity, due to the structural changes, there will be abnormal impact and friction, resulting in sound.
