Spine
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Case Reports
Irreducible dislocations of the cervical spine with a prolapsed disc: preliminary results from a treatment technique.
The preliminary results from a treatment technique for irreducible dislocations of the cervical spine with prolapsed disk are reported. ⋯ The reported technique was used successfully in the treatment of four patients with irreducible dislocations of the cervical spine.
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A case report of a bilateral lumbosacral dislocation without a fracture is presented. ⋯ Lumbosacral dislocations are rare injuries. The authors demonstrate the feasibility of a posterior lumbar interbody fusion procedure in combination with posterolateral instrumentation and fusion.
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Comparative Study
Biomechanical comparison of cervical spine interbody fusion cages.
An in vitro biomechanical study of cervical spine interbody fusion cages using a sheep model was conducted. ⋯ The biomechanical results indicate that design variations in screw and cylinder design groups are of little importance. In this study, however, cages with a cylinder design were able to control extension and bending more effectively than cages with a screw design.
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Cineradiography was used to analyze continuous dynamic motion in the lumbar spine. ⋯ Motion analyses using cineradiography helped to explain the phenomena of lumbar spine kinematics. Based on continuous dynamic-motion analysis with cineradiography, large f-e angle and disordered motion pattern during the flexion-backward course in the DS group I was considered to be caused by segmental instability. The decreased translation and disordered motion pattern throughout the flexion course in the DS group II was considered to be caused by restabilization.