scholarly journals Improving fixation strength of pedicle screw by microarc oxidation treatment: An experimental study of osteoporotic spine in sheep

2012 ◽  
Vol 30 (8) ◽  
pp. 1296-1303 ◽  
Author(s):  
Lei Shi ◽  
Ling Wang ◽  
Yang Zhang ◽  
Zheng Guo ◽  
Zi-xiang Wu ◽  
...  
Keyword(s):  
Experimental Study ◽  
Pedicle Screw ◽  
Microarc Oxidation ◽  
Fixation Strength ◽  
Oxidation Treatment

Effect of oxidation time on the microstructure and properties of ceramic coatings prepared by microarc oxidation on 7A04 superhard aluminum alloy

2017 ◽  
Vol 31 (16-19) ◽  
pp. 1744026
Author(s):  
Feng Xiao ◽  
Hui Chen ◽  
Jingguo Miao ◽  
Juan Du
Keyword(s):  
Aluminum Alloy ◽  
Microarc Oxidation ◽  
Ceramic Coatings ◽  
Ceramic Layer ◽  
X Ray Diffraction ◽  
Oxidation Treatment ◽  
X Ray ◽  
Metallurgical Bonding ◽  
Dense Ceramic ◽  
Morphology Of Surface

Under the sodium aluminates’ system, microarc oxidation treatment was conducted on the superhard aluminum alloy 7A04 for different times. The microstructure of microarc oxidation ceramic layer was investigated by using scanning electron microscopy (SEM) and X-ray diffraction (XRD). The influences of different oxidation times on the adhesion strength of ceramic layer and substrate, the morphology of surface and cross-section, the phase composition and the electrochemical properties were studied. The results indicated that the connection of the coating and substrate appears to be metallurgical bonding and dense ceramic layer, and the surface is in a “volcanic vent” morphology, which is composed of [Formula: see text]-Al2O3 and little [Formula: see text]-Al2O3. The corrosion resistance of ceramic layer is improved significantly in contrast with that of the substrate.

An Experimental Study on Initial Fixation Strength in Transpedicular Screwing Augmented With Calcium Phosphate Cement

Spine ◽  
2009 ◽  
Vol 34 (20) ◽  
pp. E724-E728 ◽  
Author(s):  
Taiga Masaki ◽  
Yutaka Sasao ◽  
Takehiko Miura ◽  
Yoshiaki Torii ◽  
Atsushi Kojima ◽  
...  
Keyword(s):  
Experimental Study ◽  
Calcium Phosphate ◽  
Calcium Phosphate Cement ◽  
Fixation Strength ◽  
Initial Fixation

Optimization of Pedicle Screw Depth in the Lumbar Spine

2013 ◽  
Author(s):  
Laura E. Buckenmeyer ◽  
Kristophe J. Karami ◽  
Ata M. Kiapour ◽  
Vijay K. Goel ◽  
Teck M. Soo ◽  
...  
Keyword(s):  
Lumbar Spine ◽  
Pedicle Screw ◽  
Pedicle Screws ◽  
Fixation Strength ◽  
Osteoporotic Patient ◽  
Insertion Depth ◽  
Anterior Cortex ◽  
Screw Insertion ◽  
Clinical Challenge ◽  
Series Of Experiments

Optimization of pedicle screw insertion depth for ideal fixation and fusion remains a clinical challenge. Improved screw purchase may improve fixation strength 1, which is especially critical in an osteoporotic patient population. Extended screw insertion depths, up to and through the anterior cortex, have yet to be compared to more commonly used shorter pedicle screws in a laboratory controlled series of experiments. The purpose of this study is to evaluate screw purchase in the osteoporotic lumbar spine as a function of insertion depth, which may be used to optimize pedicle screw-rod constructs.

scholarly journals Balancing Rigidity and Safety of Pedicle Screw Fixation via a Novel Expansion Mechanism in a Severely Osteoporotic Model

2015 ◽  
Vol 2015 ◽  
pp. 1-11 ◽  
Author(s):  
Thomas M. Shea ◽  
James J. Doulgeris ◽  
Sabrina A. Gonzalez-Blohm ◽  
William E. Lee ◽  
Kamran Aghayev ◽  
...  
Keyword(s):  
Cortical Bone ◽  
Pedicle Screw ◽  
Pedicle Screws ◽  
Pedicle Screw Fixation ◽  
Cortical Layer ◽  
Fixation Strength ◽  
Osteoporotic Bone ◽  
Pullout Strength ◽  
Initial Fixation ◽  
Increased Risk

Many successful attempts to increase pullout strength of pedicle screws in osteoporotic bone have been accompanied with an increased risk of catastrophic damage to the patient. To avoid this, a single-armed expansive pedicle screw was designed to increase fixation strength while controlling postfailure damage away from the nerves surrounding the pedicle. The screw was then subsequently tested in two severely osteoporotic models: one representing trabecular bone (with and without the presence of polymethylmethacrylate) and the other representing a combination of trabecular and cortical bone. Maximum pullout strength, stiffness, energy to failure, energy to removal, and size of the resulting block damage were statistically compared among conditions. While expandable pedicle screws produced maximum pullout forces less than or comparable to standard screws, they required a higher amount of energy to be fully removed from both models. Furthermore, damage to the cortical layer in the composite test blocks was smaller in all measured directions for tests involving expandable pedicle screws than those involving standard pedicle screws. This indicates that while initial fixation may not differ in the presence of cortical bone, the expandable pedicle screw offers an increased level of postfailure stability and safety to patients awaiting revision surgery.

Predictive Ability of Tapping Insertional Torque on Pedicle Screw Fixation Strength and Optimal Screw Size

2011 ◽  
Vol 11 (10) ◽  
pp. S160-S161
Author(s):  
Melvin Helgeson ◽  
Ronald Lehman ◽  
Anton Dmitriev ◽  
Daniel Kang ◽  
Scott Luhmann
Keyword(s):  
Pedicle Screw ◽  
Screw Fixation ◽  
Predictive Ability ◽  
Pedicle Screw Fixation ◽  
Fixation Strength ◽  
Insertional Torque

scholarly journals Experimental study of the patellar tendon fixation strength after its reconstruction

2020 ◽  
Vol 0 (4) ◽  
pp. 64-69
Author(s):  
Oleg Vyrva ◽  
Ivan Skoryk ◽  
Mykhaylo Karpinsky ◽  
Olena Karpinska
Keyword(s):  
Experimental Study ◽  
Patellar Tendon ◽  
Fixation Strength
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