Knee braces are a frequent medical care product in the field of sports injuries. The majority of patients with knee injuries who have undergone surgery are protected by a special knee brace under medical supervision. Some patients, however, will also require appropriate functional rehabilitation under the protection of a brace during conservative treatment after a knee injury. As a type of orthosis, the main types of braces currently used in clinical practice can be broadly divided into rehabilitation braces and functional braces. The former is mostly used after surgery and is designed for a specific combination of protection and exercise. It is characterized by a protective effect, while helping the patient to perform the necessary functional exercises as much as possible. Traditionally, the knee has been fixed in a plaster cast after surgery, which is a less expensive material, but is heavier, less breathable, and very uncomfortable for the patient after molding. Modern knee braces are lighter in weight and at the same time have sufficient strength. Some of the better designed products are easy to use and allow the patient to disassemble themselves, making it easier to strike a balance between protection and exercise. Rehabilitative knee braces have adjustable or non-adjustable joint movements, depending on the doctor’s recommendation. The most common type of functional brace used in China today is the “knee brace”, which is the simplest form of brace. However, for people who have special sporting requirements, or who have joint disease but also have sporting needs, a simple “knee brace” is far from being able to accomplish the task. It is necessary to wear a specific brace, with the help of a doctor, in order to function during sports. Most of these braces are custom-made and costly. The materials are lightweight, and carbon fiber products are now available. They can help patients with minor injuries to perform better even at high levels of competition. ”How do I choose a brace?” As a product with a medical purpose, a brace is not just an everyday consumer product that can be used as you wish. Especially after knee surgery, different patients need to pay close attention to different issues during the rehabilitation process, the degree of recovery of joint movement varies, and the use of braces, timing and precautions are different. Some patients, in the pursuit of “affordability”, choose unregulated and shoddy products on the market, which not only fail to protect the joint, but also increase the risk of re-injury after surgery, and may prevent the functional rehabilitation of the joint. Therefore, we recommend that when you have special needs, it is important to communicate with your doctor to make the right choice of knee brace.