Balancing Rigidity and Safety of Pedicle Screw Fixation via a Novel Expansion Mechanism in a Severely Osteoporotic Model
Joint Authors
Doulgeris, James J.
Lee, William E.
Vrionis, Frank D.
Gonzalez-Blohm, Sabrina A.
Shea, Thomas M.
Aghayev, Kamran
Source
Issue
Vol. 2015, Issue 2015 (31 Dec. 2015), pp.1-11, 11 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2015-02-01
Country of Publication
Egypt
No. of Pages
11
Main Subjects
Abstract EN
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.
American Psychological Association (APA)
Shea, Thomas M.& Doulgeris, James J.& Gonzalez-Blohm, Sabrina A.& Lee, William E.& Aghayev, Kamran& Vrionis, Frank D.. 2015. Balancing Rigidity and Safety of Pedicle Screw Fixation via a Novel Expansion Mechanism in a Severely Osteoporotic Model. BioMed Research International،Vol. 2015, no. 2015, pp.1-11.
https://search.emarefa.net/detail/BIM-1055038
Modern Language Association (MLA)
Shea, Thomas M.…[et al.]. Balancing Rigidity and Safety of Pedicle Screw Fixation via a Novel Expansion Mechanism in a Severely Osteoporotic Model. BioMed Research International No. 2015 (2015), pp.1-11.
https://search.emarefa.net/detail/BIM-1055038
American Medical Association (AMA)
Shea, Thomas M.& Doulgeris, James J.& Gonzalez-Blohm, Sabrina A.& Lee, William E.& Aghayev, Kamran& Vrionis, Frank D.. Balancing Rigidity and Safety of Pedicle Screw Fixation via a Novel Expansion Mechanism in a Severely Osteoporotic Model. BioMed Research International. 2015. Vol. 2015, no. 2015, pp.1-11.
https://search.emarefa.net/detail/BIM-1055038
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1055038