Arthroscopic surgery of the knee does not require a cast, because the cast is not conducive to functional exercises of knee flexion and extension, but an adjustable brace is required for postoperative fixation, which enables early functional exercises of the knee joint, and can also play a role in fixation of the knee joint. This will help the patient to perform functional exercises of knee flexion and extension in bed after surgery, and also to wear a brace to support the crutches under the bed to avoid the early dislodgement or fracture of the internal fixation after arthroscopy, and to perform functional exercises under the guidance of the doctor or at home if wearing an adjustable brace, which is good for the recovery of the joint.