Knee osteoarthritis, also known as knee osteoarthrosis, degenerative arthritis, proliferative arthritis, and age-related arthritis, is a degenerative joint disease characterized by degenerative changes in joint cartilage as well as bone proliferation. Knee osteoarthritis starts slowly, and symptoms usually appear after the age of 40, mainly manifesting as knee discomfort or dull pain, knee swelling, and inconvenience in walking up and down stairs, which is progressively aggravated; if the proliferated bone flab is shed to form free body, joint interlocking may appear; joint effusion and joint swelling may appear in the acute aggravation period, which may be accompanied by muscle atrophy or muscle spasm. In severe cases, the knee joint may become deformed and unable to walk normally. Typical radiographs show osteophytes and narrowing of the joint space. Commonly used treatments include oral anti-inflammatory painkillers, chondroprotective agents, joint cavity injection of sodium glacial, knee brace, and artificial knee replacement. Knee brace is a type of brace developed in recent years, which has been clinically observed and researched to have a therapeutic effect on knee osteoarthritis with inversion or valgus deformity. The principle of action is to increase the stability of the knee joint, correct the deformity of the knee joint, reduce the load on the knee joint, restore the neutral line of the knee joint, and protect the knee joint, thus relieving the symptoms of knee pain without any side effects. It is an effective treatment for early and mid-stage knee osteoarthritis, and can also be used to treat patients with severe knee osteoarthritis who are unwilling or unable to undergo surgery.