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Biomechanical Stability of a Cross-Rod Connection with a Pedicle Screw System

Tetsutaro Mizuno, Toshihiko Sakakibara, Takamasa Yoshikawa, Tadashi Inaba, Takaya Kato, Yuichi Kasai

(Department of Spinal Surgery and Medical Engineering, Mie University Graduate School of Medicine, Tsu, Mie, Japan)

Med Sci Monit Basic Res 2018; 24:26-30

DOI: 10.12659/MSMBR.906339


BACKGROUND: Surgery with pedicle screw instrumentation does not provide sufficient torsional stability. This leads to pseudoarthrosis, loosening of the pedicle screws, and, ultimately, implant failure.
MATERIAL AND METHODS: Functional spinal units from 18 deer were evaluated using a 6-axis material testing machine. As specimen models, we prepared an intact model, a damaged model, a cross-rod model, and a cross-link model. We measured the range of motion (ROM) during bending and rotation tests.
RESULTS: The range of motions of cross-rod model were almost equal to those of cross-link model during the bending test. In the rotation test, the average ranges of motion of the intact, cross-rod, and cross-link models were 2.9°, 3.1°, and 3.9° during right rotation and 2.9°, 3.1°, and 4.1° during left rotation, respectively. The range of motions of the cross-rod model were significantly smaller than those of the cross-link model during the rotation test. The range of motions of the intact model were significantly smaller than those of the cross-link model during the rotation test, but there were no statistically significant differences between the range of motions of intact model and cross-rod model during the rotation test.
CONCLUSIONS: The stability of spinal fixation such as cross-rod model is equal to the fixation using the pedicle screw system during bending tests and equal to that of the intact spine during rotation tests.

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