Removable foot pad: It is made of comfortable materials, and the foot pad is used to support the sole of the foot, increase the height of the sole of the foot, and make it more comfortable to wear. Precise chuck adjustment: The extension angle of the knee joint is adjustable in the range of -10°-90°, and the bending degree is adjustable in the range of -10°-120°. Removable breathable inner lining: The foot pad is made of comfortable and breathable fabric, which is comfortable to wear and not stuffy, and the pad is removable for easy cleaning. Reinforced ring buckle: easy adjustment, comfortable and convenient to wear, safe and reinforced, long-lasting durability. Scope of application : knee joint, ankle joint, foot fracture or post-injury fixation, postoperative or conservative treatment of lower extremity trauma, postoperative knee joint fracture, postoperative knee ligament, bone injury or conservative treatment.