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Monoaxial Pedicle Screws Are Superior to Polyaxial Pedicle Screws and the Two Pin External Fixator for Subcutaneous Anterior Pelvic Fixation in a Biomechanical Analysis
Joint Authors
Vaidya, Rahul
Roth, Matthew
Onwudiwe, Ndidi
Sethi, Anil
Source
Issue
Vol. 2013, Issue 2013 (31 Dec. 2013), pp.1-6, 6 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2013-12-03
Country of Publication
Egypt
No. of Pages
6
Main Subjects
Abstract EN
Purpose.
Comparison of monoaxial and polyaxial screws with the use of subcutaneous anterior pelvic fixation.
Methods.
Four different groups each having 5 constructs were tested in distraction within the elastic range.
Once that was completed, 3 components were tested in torsion within the elastic range, 2 to torsional failure and 3 in distraction until failure.
Results.
The pedicle screw systems showed higher stiffness (4.008 ± 0.113 Nmm monoaxial, 3.638 ± 0.108 Nmm Click-x; 3.634 ± 0.147 Nmm Pangea) than the exfix system (2.882 ± 0.054 Nmm) in distraction.
In failure testing, monoaxial pedicle screw system was stronger (360 N) than exfixes (160 N) and polyaxial devices which failed if distracted greater than 4 cm (157 N Click-x or 138 N Pangea).
The exfix had higher peak torque and torsional stiffness than all pedicle systems.
In torsion, the yield strengths were the same for all constructs.
Conclusion.
The infix device constructed with polyaxial or monoaxial pedicle screws is stiffer than the 2 pin external fixator in distraction testing.
In extreme cases, the use of reinforcement or monoaxial systems which do not fail even at 360 N is a better option.
In torsional testing, the 2 pin external fixator is stiffer than the pedicle screw systems.
American Psychological Association (APA)
Vaidya, Rahul& Onwudiwe, Ndidi& Roth, Matthew& Sethi, Anil. 2013. Monoaxial Pedicle Screws Are Superior to Polyaxial Pedicle Screws and the Two Pin External Fixator for Subcutaneous Anterior Pelvic Fixation in a Biomechanical Analysis. Advances in Orthopedics،Vol. 2013, no. 2013, pp.1-6.
https://search.emarefa.net/detail/BIM-490225
Modern Language Association (MLA)
Vaidya, Rahul…[et al.]. Monoaxial Pedicle Screws Are Superior to Polyaxial Pedicle Screws and the Two Pin External Fixator for Subcutaneous Anterior Pelvic Fixation in a Biomechanical Analysis. Advances in Orthopedics No. 2013 (2013), pp.1-6.
https://search.emarefa.net/detail/BIM-490225
American Medical Association (AMA)
Vaidya, Rahul& Onwudiwe, Ndidi& Roth, Matthew& Sethi, Anil. Monoaxial Pedicle Screws Are Superior to Polyaxial Pedicle Screws and the Two Pin External Fixator for Subcutaneous Anterior Pelvic Fixation in a Biomechanical Analysis. Advances in Orthopedics. 2013. Vol. 2013, no. 2013, pp.1-6.
https://search.emarefa.net/detail/BIM-490225
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-490225