Long Construct Pedicle Screw Reduction and Residual Forces are Decreased Using aComputer-assisted Rod Bending System

Long Construct Pedicle Screw Reduction and Residual Forces are Decreased Using a Computer-assisted Rod Bending System Previous biomechanical studies have shown that reduction loads placed on pedicle screws during assembly of the construct, with a rod that does not adequately fit the screw locations, can reduce the strength of the screw-bone interfaces. In this bench top study, axial pedicle screw forces on a unilateral 7-level construct were evaluated for 2 rod bending techniques: manual and computerassisted.

[1]  Thomas R. Oxland,et al.  The Effect of Nucleotomy on Lumbar Spine Mechanics in Compression and Shear Loading , 2001, Spine.

[2]  S. Chung,et al.  Comparison of Multifidus Muscle Atrophy and Trunk Extension Muscle Strength: Percutaneous Versus Open Pedicle Screw Fixation , 2005, Spine.

[3]  Neil R Crawford,et al.  Biomechanical Assessment of Anterior Lumbar Interbody Fusion With an Anterior Lumbosacral Fixation Screw-Plate: Comparison to Stand-Alone Anterior Lumbar Interbody Fusion and Anterior Lumbar Interbody Fusion With Pedicle Screws in an Unstable Human Cadaver Model , 2006, Spine.

[4]  J. Eck,et al.  The Effect of Contouring on Fatigue Strength of Spinal Rods: Is it Okay to Re-bend and Which Materials Are Best? , 2013, Spine deformity.

[5]  Warren D. Yu,et al.  Feasibility of Minimally Invasive Sacropelvic Fixation: Percutaneous S2 Alar Iliac Fixation , 2010, Spine.

[6]  Hubert Labelle,et al.  Biomechanical Analysis of 4 Types of Pedicle Screws for Scoliotic Spine Instrumentation , 2012, Spine.

[7]  S. Cook,et al.  Effects of Bone Mineral Density on Pedicle Screw Fixation , 1994, Spine.

[8]  G. Huber,et al.  Estimation of shear load sharing in moderately degenerated human lumbar spine. , 2013, Journal of biomechanics.

[9]  A. Tencer,et al.  Caudo-cephalad loading of pedicle screws: mechanisms of loosening and methods of augmentation. , 1993, Spine.

[10]  Thomas R Oxland,et al.  Thoracolumbar spine mechanics contrasted under compression and shear loading , 2002, Journal of orthopaedic research : official publication of the Orthopaedic Research Society.

[11]  N. Anand,et al.  Minimally Invasive Multilevel Percutaneous Correction and Fusion for Adult Lumbar Degenerative Scoliosis: A Technique and Feasibility Study , 2008, Journal of spinal disorders & techniques.

[12]  Keith D K Luk,et al.  Pure Shear Properties of Lumbar Spinal Joints and the Effect of Tissue Sectioning on Load Sharing , 2005, Spine.

[13]  Z. Gokaslan,et al.  Maximizing the potential of minimally invasive spine surgery in complex spinal disorders. , 2008, Neurosurgical focus.

[14]  P. Newton,et al.  Would CoCr Rods Provide Better Correctional Forces Than Stainless Steel or Titanium for Rigid Scoliosis Curves? , 2013, Journal of spinal disorders & techniques.

[15]  Gerd Huber,et al.  Shear strength of the human lumbar spine. , 2012, Clinical biomechanics.

[16]  F. Phillips,et al.  A Prospective, Nonrandomized, Multicenter Evaluation of Extreme Lateral Interbody Fusion for the Treatment of Adult Degenerative Scoliosis: Perioperative Outcomes and Complications , 2010, Spine.

[17]  Kai-Ming G. Fu,et al.  Complications in adult spinal deformity surgery: an analysis of minimally invasive, hybrid, and open surgical techniques. , 2014, Neurosurgical focus.

[18]  J. Torner,et al.  Biomechanical comparison of single- and dual-lead pedicle screws in cadaveric spine. , 2008, Journal of neurosurgery. Spine.

[19]  R. Lehman,et al.  The biomechanical consequences of rod reduction on pedicle screws: should it be avoided? , 2011, The spine journal : official journal of the North American Spine Society.