| Scoliosis is a serious threat to the physical and mental health of young people of spinal deformities, the incidence is higher. At present, the treatment of scoliosis main observation, orthopedic braces, three methods of operation. For younger patients with the treatment of scoliosis has been a thorny problem. For some patients this will not only need to be able to effectively correct the spinal deformity, but also the need to maintain the growth of the spine the ability to expand the thoracic volume, reducing the spine, thoracic malformation of the heart, lung and other important organ development. Most will try to support patients with early treatment, however, brace treatment because of the many defects and the majority of young children with difficulties in treatment often result in support of it will not be effective, once the brace treatment fails, surgery has become the only effective treatment. Standard posterior fusion can be very good although the correction of deformity but at the same time has also brought many problems, such as: As a result of early fusion in children with disproportionately short trunk, the occurrence of the crankshaft, as well as deformities affecting the growth of lung tissue leading to ventilation dysfunction and so on. For decades, the growth of foreign technology for its bars in the correction of spinal deformity in children at the same time able to retain the growth potential of the spine and spinal surgeon to be a lot of young children used in the treatment of scoliosis, and have achieved satisfactory results but at the same time there are many problems, such as complications of internal fixation (link, broken sticks, broken wire, etc.), wound infection and spontaneous spinal fusion, etc., which eventually led to the growth of the spine affecting the ability of inhibiting the growth of rod technology.To this end, we analyzed the current domestic and foreign common pedicle screw fixation system of the structural characteristics of the design of an improved pedicle screw rod system may avoid the above problems. Application of this experimental method of biomechanical testing, on the improvement of the pedicle screw-rod system and the Universal Spine System for spinal scoliosis fixed intensity, stiffness and stability of comparison, in order to provide experimental basis for clinical application.Objective: On the improvement of the pedicle screw-rod system and the Universal Spine System (USS) in the spine scoliosis fixed intensity, stiffness and stability of the biomechanical aspects of comparison, to test the improvement of the pedicle screw-rod fixation of the biological system stability mechanical properties.Methods:⑴Design of an improved pedicle screw rod system. The internal fixation devices for the ends of the middle slide lock design is characterized by growth with the retention of the growth of the spine, orthopedic pedicle screw in the automatic sliding bar to automatically do not need to extend the range of operation, a surgery, surgery less, reducing the infection and the risk of skin healing.⑵The use of 12 fresh porcine spine specimens were randomly divided into two groups, namely general spine system (USS) and improved pedicle screw rod system is fixed, and measured under different conditions of the T12 vertebral body displacement, and calculate their strength and stiffness comparison.Results: The sliding groups and universal groups in the axial compression, flexion, extension, flexor, the principal strain and displacement changes and the fixed intensity, stiffness were not significantly different (P> 0.05).Conclusion: improved pedicle screw system to the treatment of scoliosis pedicle screw system with the same general orthopedic and biomechanical effects of stability, but also can not affect the growth and development of young people. |
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