A biomechanical assessment of infra-laminar hooks as an alternative to supra-laminar hooks in thoracolumbar fixation

Spine
Hideki MurakamiWilliam C Hutton

Abstract

Biomechanical study, using human cadaveric spines, of two types of posterior fixation in the thoracolumbar spine. To compare fixation in the thoracolumbar spine using pedicle screws combined with infra-laminar hooks (at both the cranial and caudal ends of the same vertebra) with fixation using pedicle screws alone. The standard method of using laminar hooks is to place supra-laminar hooks at the level above the vertebra being fixed by the cranial pedicle screws, and infra-laminar hooks at the level of the vertebra receiving the caudal pedicle screws. However, using this method, a single normal motion segment is killed. In the proposed technique, infra-laminar hooks will be used at the same level as the cranial pedicle screws, thus sparing the superior adjacent segment. PEDICLE SCREW LOOSENING TEST: Nine vertebrae (T9-L2) had pedicle screws inserted into both pedicles. On one side, the pedicle screw was connected to a fixation rod, while on the other side the pedicle screw was combined with an infra-laminar hook and connected to a rod. The rod on one side was then pushed with increasing force until loosening of the screw. The same test was repeated on the other rod until loosening of the screw. The reverse test (i.e., pulling un...Continue Reading

References

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Citations

Jan 7, 2010·Journal of Spinal Disorders & Techniques·Takahiko HamasakiWilliam C Hutton
Jul 14, 2016·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Hans-Joachim WilkeMichael Rauschmann
Jun 16, 2018·Journal of Neurosurgery. Spine·Amirali ToossiVivian K Mushahwar
May 20, 2020·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Haruo KannoEiji Itoi

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