Scope of application: knee joint, ankle joint, foot fracture or post-injury fixation, postoperative or conservative treatment of lower limb trauma, postoperative knee joint fracture, postoperative knee ligament, bone injury or conservative treatment. Plastic parts are made of high quality PE material, non-toxic, odorless, high strength, good wear resistance and good chemical stability. Knee joint external fixation bracket, multi-row hole design Suede straps are soft, comfortable and easy to adjust. The perforated composite fabric is breathable and comfortable. It is also detachable for easy cleaning, and the surface of the plastic parts is designed with ventilation holes for comfortable use in summer. The size of the legs is adjustable, and the legs are strips for adjusting the legs. The inner and outer sides are made of high-strength aluminum alloy support frame, and the support effect is good. The angle adjuster adjusts the curvature and extension of the knee joint, overcomes the shortcomings of the non-breathable polymer material, and is comfortable to wear and not boring.