title: [Biomechanical test of the general spinal pedicle screw-rod orthopaedics fixation system in the treatment of diseases related to spinal instability].
abstract: OBJECTIVE
  To evaluate the biomechanical performance of the spinal universal fixation system(GSPS) in treating the diseases related to spinal instability.
  
  
  METHODS
  Four instable models and 4 fracture models were made of fresh pig's thoracolumbar specimens (T10-L3). Self-designed GSPS were used in the simulated operation. Axial loading test and torsion test were made. The stress-strain relation of the GSPS was observed. The extracting force of link bar from elastic jig was tested.
  
  
  RESULTS
  The strain value of each tested point changed linearly when the axial load changed from 0 to 600 N. There was linear relation between the torsion and the torsion angle. The latter was less than 6 degrees when the former reached 300 N x cm. The minimum extracting force of the link bar from the elastic jig was more than 3 300 N.
  
  
  CONCLUSIONS
  The GSPS has high energy and high elasticity on anti-axial and anti-torsion load. It is stable to use elastic link bar.
authors.affiliation: Department of Spine and Spinal Cord Surgery of Wendeng Orthopaedics Hospital, Weihai 264400, Shandong, China. liujun0528@yahoo.com.cn
authors.forename: Jun
authors.initials: J
authors.lastname: Liu
authors.forename: En-zhong
authors.initials: EZ
authors.lastname: Zhang
authors.forename: Yuan-chao
authors.initials: YC
authors.lastname: Tan
mesh_terms: D001696:Biomechanical Phenomena; D001863:Bone Screws; D006801:Humans; D016268:Internal Fixators; D007593:Joint Instability / Q000503:physiopathology / Q000601:surgery*; D013122:Spinal Diseases / Q000503:physiopathology / Q000601:surgery*