With the development of modern cities, the incidence of vertebral compression fractures due to falls from height and trauma from car accidents is gradually increasing. It is currently considered that for vertebral compression fractures without spinal cord injury, if the compression is greater than 1/3 of the normal vertebral height, surgery is recommended to rebuild the stability of the spine and restore the vertebral height. Internal fixation with pedicle screws is the most commonly used technique for posterior spinal fixation because of its short segment and three-column fixation. However, the conventional surgical method has a large intraoperative incision and bleeding, and the stability of the posterior musculoligamentous complex is also destroyed and the postoperative period is characterized by extensive muscle fibrosis, muscle weakness and abnormal sensation, which are not suitable for patients. The application of posterior lumbar minimally invasive surgery can achieve both good repositioning ability and reduced stripping, reducing the secondary trauma of surgery. Minimally invasive surgery has the advantages of small incision, less bleeding and less tissue destruction. It is a minimally invasive internal fixation system for the treatment of thoracolumbar fractures that we designed on the basis of the traditional pedicle nail. Its innovations include: 1. The RTS self-rotating brace spine minimally invasive internal fixation system, which consists of a rod, rotating pedicle nail and locking screw. The head of the screw is designed with a unique beveled arc groove, so that the screw generates rotational force along the locking nail, and the rotation angle is such that the rod eventually fits completely with the arc groove of the screw head, and the locked screw force is transmitted from the sphere and can generate 15Kg thrust. Due to this rotation will be vertebral body propped up, to achieve fracture reset and deformity correction, the injured vertebral body to restore the normal height. 2.The unique beveled circular groove of the screw head makes the screw produce self-rotating reset thrust, and the vertebral body props up well, so that good reset can be obtained without bending the rod. It is convenient for the implantation of the connecting rod and the fixation of the locking nut, avoiding the poor reset caused by the rotation of the rod when the nut is tightened, simplifying the surgical procedure and shortening the operation time. The RTS system has excellent mechanical properties, and the axial compression stiffness, bending stiffness and torsional mechanical properties are close to those of normal vertebrae after fixation by the RTS system in the physiological functional state of thoracolumbar fracture compared with normal spine. Axial pullout force is mostly used to evaluate the strength of pedicle screw fixation. Because the shear stress between the screw and its surrounding bone tissue determines the axial pullout force, the axial pullout force can better reflect the initial strength of the bone-screw interface.