Biomechanical evaluation of pedicle screw fixation system in spinal adjacent levels using polyetheretherketone, carbon-fiber-reinforced polyetheretherketone, and traditional titanium as rod materials

2017 ◽  
Vol 130 ◽  
pp. 248-256 ◽  
Author(s):  
Kyoung-Tak Kang ◽  
Yong-Gon Koh ◽  
Juhyun Son ◽  
Jin S. Yeom ◽  
Joon-Hee Park ◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Fiber Reinforced ◽  
Biomechanical Evaluation ◽  
Carbon Fiber Reinforced ◽  
Fixation System

Clinical outcomes and complications associated with pedicle screw fixation—augmented lumbar interbody fusion

2004 ◽  
Vol 1 (3) ◽  
pp. 261-266 ◽  
Author(s):  
Dennis J. Rivet ◽  
David Jeck ◽  
James Brennan ◽  
Adrian Epstein ◽  
Carl Lauryssen
Keyword(s):  
Carbon Fiber ◽  
Pedicle Screw ◽  
Interbody Fusion ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Lumbar Interbody Fusion ◽  
Content Type ◽  
Repeated Surgery ◽  
Fine Print

Object. The authors conducted a prospective study to evaluate the clinical and radiological outcomes and complications associated with uni- and bilateral transforaminal lumbar interbody fusion (TLIF) performed using carbon fiber Brantigan I/F Cages and pedicle screw fixation. Methods. Forty-two consecutive patients who had undergone uni- or bilateral TLIF between February 1999 and July 2000 were prospectively evaluated. Clinical outcome was graded using a modified Prolo Scale, the McGill Pain Index Scale, a follow-up questionnaire, and charts. An independent radiologist assessed radiological outcomes. All patients were followed for at least 1 year. Based on Prolo Scale scores, an excellent or good 1-year outcome was achieved in 73% of patients; 90% of patients responded that they would undergo the procedure again. At 1 year, radiographic fusion was demonstrated in 74% and was statistically related to clinical outcome (p < 0.05). There were no deaths or major hardware failures. Complications requiring repeated surgery included one case of cerebrospinal fluid (CSF) leakage and one case in which the hemovac drain was retained. There were four cases involving minor wound infections, eight involving CSF leaks, and none requiring repeated surgery. On routine follow-up radiography one pedicle screw was found to be broken; the patient remained asymptomatic and fusion occurred. Conclusions. Unilateral and bilateral TLIF involving placement of carbon fiber cages and pedicle screw fixation are effective treatment options in patients with indications for lumbar arthrodesis. The procedures result in acceptable rates of fusion and clinical success, and a minimal incidence of morbidity when performed by an experienced surgeon.

Biomechanical evaluation of a dynamic pedicle screw fixation device

2006 ◽  
Vol 21 (4) ◽  
pp. 330-336 ◽  
Author(s):  
Hua-Zi Xu ◽  
Xiang-Yang Wang ◽  
Yong-Long Chi ◽  
Qing-An Zhu ◽  
Yan Lin ◽  
...  
Keyword(s):  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Fixation Device ◽  
Biomechanical Evaluation

The Wiltse Pedicle Screw Fixation System

Orthopedics ◽  
1988 ◽  
Vol 11 (10) ◽  
pp. 1455-1460
Author(s):  
David W Guyer ◽  
Leon L Wiltse ◽  
Richard D Peek
Keyword(s):  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Fixation System

Hook—rod with pedicle screw fixation for unstable spinal fracture

2000 ◽  
Vol 92 (1) ◽  
pp. 117-121
Author(s):  
Marin F. Stančić ◽  
Vladimir Mićcović ◽  
Mark Potočnjak
Keyword(s):  
Pedicle Screw ◽  
Screw Fixation ◽  
Spinal Fracture ◽  
Pedicle Screw Fixation ◽  
Neurological Deficits ◽  
Content Type ◽  
Fixation System ◽  
Fine Print

U A technique is described in which spinal fracture repositioning, decompression, and stabilization are achieved by a combination of hook—rod and pedicle screw fixation. This straightforward technique is useful for performing acute decompression in patients with partial neurological deficits and multisystem injuries. A laminectomy allows for placement of a stiffer fixation system, and it improves the insufficient canal clearance obtained when performing annulotaxis alone.

scholarly journals Development and Biomechanical Analysis of a New Anterior Cervical Pedicle Screw Fixation System

2021 ◽  
Author(s):  
Maji Sun ◽  
Qiuan Wang ◽  
Xingchen Zhang ◽  
Rui Zhao ◽  
Kaijin Guo ◽  
...  
Keyword(s):  
Cervical Spine ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Cervical Pedicle Screw ◽  
Cervical Pedicle ◽  
Group B ◽  
Group D ◽  
Fixation System ◽  
Better Than

Abstract ObjectiveA new anterior cervical pedicle screw fixation system was developed based on the relevant anatomical structure of the cervical spine, and its biomechanical properties were evaluated on fresh cadaver cervical spine specimens to provide a basis for preliminary clinical application. MethodsThree-dimensional parameters of the new nail plate system were obtained from the anatomical data of cervical spine specimens, and the system was produced by 3D printing technology. Fresh adult cadaver cervical spine specimens were used to measure biomechanical stability in the intact state (group A: complete group) and to establish a C5-7 instability model in which fixation with the traditional cervical anterior nail plate system was performed (group B). Anterior cervical spine displacement, strength, stiffness, torsion torque, etc. were measured under the fixed state when 4 screws were used for fixation with the pedicle screw system (group C) and 6 screws were used for the anterior cervical pedicle screw system (group D). ResultsIn terms of the load-displacement relationship, the results showed that the average displacement difference between group D and group C after the test was 25%, that between group D and group B was 30%, that between groups C and B was 18%, and the differences were statistically significant (P <0.05). In terms of the axial stiffness of the cervical spine, that of group D was 20% higher than that of group C and 40% higher than that of group B, that of group C was 20% higher than that of group B when fixed, and those of group D and C were both better than that of group A, the blank control group; all the differences were statistically significant (P<0.05). In terms of torsion mechanical properties of the cervical spine, the experimental results showed that that of group D was higher than that of group C by 21% and higher than that of group B by 40%, that of group C was higher than that of group B by 30%, and the differences were statistically significant (P<0.05). The biomechanical tests showed that in terms of load-displacement, axial stiffness and torsional mechanical properties, the anterior cervical pedicle locking and guiding internal fixation system was slightly better than the complete method. The 6 nail fixation method was better than the 4 nail fixation method. ConclusionThe new anterior cervical pedicle screw fixation system conforms to the anatomy of Chinese individuals and has better mechanical stability than do traditional fixation methods. It is a new, reliable anterior cervical pedicle internal fixation system for clinical practice.List of Abbreviations: ACPS: anterior cervical pedicle screw.

scholarly journals Retropharyngeal Reduction Plate for Treatment of Irreducible Atlantoaxial Dislocation: A Cadaveric Test and Finite Element Analysis

2020 ◽  
Author(s):  
Yukun Du ◽  
Zhao Meng ◽  
Jianyi Li ◽  
Zheng Zhao ◽  
Xiangyang Wang ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pedicle Screw ◽  
Screw Fixation ◽  
Pedicle Screw Fixation ◽  
Atlantoaxial Dislocation ◽  
Element Analysis ◽  
Irreducible Atlantoaxial Dislocation ◽  
Plate System ◽  
Fixation System

Abstract Background: Clinical studies have shown that irreducible atlantoaxial dislocation (IAAD) can achieve reduction, decompression, fixation and fusion by transoral, posterior, and other traditional approaches. The present study aims to introduced a newly designed reduction plate through the retropharyngeal approach and evaluate its feasibility by cadaveric test and finite element analysis.Methods: A cadaveric specimen and a 45-year-old postoperative female patient diagnosed with IAAD who underwent the traditional posterior fixation were enrolled in this scientific study. The retropharyngeal approach involved placing the reduction plate into a cadaveric specimen’s cervical spine. Spiral CT thinly scanning (0.05 mm) from the base of the occipital bone to C7 vertebrae was performed and reconstructed for three-dimensional (3D) finite element analysis using Mimics software based on the Dicom data of two different fixations. Biomechanical distribution was compared between two fixations under different stress conditions, including flexion, extension, bending and rotation, respectively.Results: There was no significant difference in maximum stress between the retropharyngeal reduction plate system and the posterior atlantoaxial pedicle screw fixation system during flexion. Under states of extension, bending and rotation, the maximum stress of the reduction plate system was significantly lower than that of the posterior atlantoaxial pedicle screw fixation system. Both of the maximum stresses between two fixations were far lower than the maximum yield strength (795-827 MPa) and ultimate strength (860-896 MPa) of the titanium alloys. There was no significantly stress concentration between retropharyngeal reduction plate system and the posterior atlantoaxial pedicle screw fixation system under different movement.Conclusions: The cadaveric test showed that it is feasible to place the reduction plate using the retropharyngeal approach. The finite element analysis indicated that the retropharyngeal reduction plate system may provide relatively reliable fixation compared with traditional posterior fixation. A new choice of designing a surgical plan for treating atlantoaxial dislocation is presented.

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