Abstract:

BACKGROUND: Posterior pedicle screw fixation system is the most common treatment for lumbar fractures, characterized as easy operation, short time, small damage and little bleeding.
OBJECTIVE: To analyze the mechanical properties of pedicle screw-rod fixation system under different conditions.
METHODS: The author retrieved PubMed and Wanfang databases (1990/2010) for articles about lumbar fracture treatment, clinical application, mechanical parameters, intensity, fatigue and safety of pedicle screw-rod fixation system as well as relevant finite element studies.
RESULTS AND CONCLUSION: Pedicle screw-rod fixation system can effectively restore vertebral body height and curvature to correct deformity and maintain the three-dimensional position of the spine. The design, implant angle, and implant depth of the different implants as well as the number of fixed segments result in different mechanical properties. We can get the best fixation effect based on the understanding of these properties, proper implanting method and fixation of appropriate units.