The effect of starting point placement technique on thoracic transverse process strength: an ex vivo biomechanical study.

Scoliosis
Barrett S BrownMarc A Asher

Abstract

The use of thoracic pedicle screws in spinal deformity, trauma, and tumor reconstruction is becoming more common. Unsuccessful screw placement may require salvage techniques utilizing transverse process hooks. The effect of different starting point placement techniques on the strength of the transverse process has not previously been reported. The purpose of this paper is to determine the biomechanical properties of the thoracic transverse process following various pedicle screw starting point placement techniques. Forty-seven fresh-frozen human cadaveric thoracic vertebrae from T2 to T9 were disarticulated and matched by bone mineral density (BMD) and transverse process (TP) cross-sectional area. Specimens were randomized to one of four groups: A, control, and three others based on thoracic pedicle screw placement technique; B, straightforward; C, funnel; and D, in-out-in. Initial cortical bone removal for pedicle screw placement was made using a burr at the location on the transverse process or transverse process-laminar junction as published in the original description of each technique. The transverse process was tested measuring load-to-failure simulating a hook in compression mode. Analysis of covariance and Pearson corre...Continue Reading

References

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Citations

Jun 8, 2011·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Zoltán CsernátonyLászló Kiss
Mar 23, 2017·Clinical Spine Surgery : a Spine Publication·Rohan-Jean BiancoCarl-Éric Aubin

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