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Chao-Hung Kuo, Wen-Cheng Huang, Jau-Ching Wu, Tsung-Hsi Tu, Li-Yu Fay, Ching-Lan Wu and Henrich Cheng

Wu JC , Huang WC , Tsai HW , Ko CC , Wu CL , Tu TH , : Pedicle screw loosening in dynamic stabilization: incidence, risk, and outcome in 126 patients . Neurosurg Focus 31 ( 4 ): E9 , 2011 10.3171/2011.7.FOCUS11125 21961872 38 Yee TJ , Terman SW , La Marca F , Park P : Comparison of adjacent segment disease after minimally invasive or open transforaminal lumbar interbody fusion . J Clin Neurosci 21 : 1796 – 1801 , 2014 10.1016/j.jocn.2014.03.010 24880486

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Daryl R. Fourney, Dima Abi-Said, Frederick F. Lang, Ian E. McCutcheon and Ziya L. Gokaslan

one serious medical condition, although subgroup analysis for diabetes, myelosuppression, and other medical diseases revealed no other associations. Our 30-day mortality rate was only 1%. With regard to instrumentation failure, we had only one case of pedicle screw loosening and one case of pedicle screw fracture; thus, the rate of pedicle screw—related late instrumentation failure was only 2%. The low rate of pedicle screw failure, even in long-term survivors, is likely related to our emphasis on the reconstruction of the anterior spinal column to restore the

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functional outcome measurements related to spinal stiffness following spinal arthrodesis. Conclusion: Among asymptomatic volunteers, limitations due to lumbar spine stiffness were low. In addition, LSDI score worsened with advancing age. Neurosurg Focus Neurosurgical Focus FOC 1092-0684 American Association of Neurological Surgeons 2013.1.FOC-LSRSABSTRACTS Poster Abstract Poster 6. Comparison Of Cortical Trajectory And Traditional Pedicle Screw Loosening In Lumbar Spine With Cyclic Loading Erkan Alci , MD , and