One-screw fixation provides similar stability to that of two-screw fixation for type II dens fractures.

Clinical Orthopaedics and Related Research
Gang FengArndt P Schulz

Abstract

Anterior screw fixation has been widely adopted for the treatment of type II dens fractures. However, there is still controversy regarding whether one- or two-screw fixation is more appropriate. We addressed three questions: (1) Do one- and two-screw fixation techniques differ regarding shear stiffness and rotational stiffness? (2) Can shear stiffness and rotational stiffness after screw fixation be restored to normal? (3) Does stiffness after screw fixation correlate with bone mineral density (BMD)? We randomly assigned 14 fresh axes into two groups (seven axes each): one receiving one-screw fixation and another receiving two-screw fixation. Shear and torsional stiffness were measured using a nondestructive low-load test in six directions. A transverse osteotomy then was created at the base of the dens and fixed using one or two screws. Shear and torsional stiffness were tested again under the same testing conditions. Mean stiffness in all directions after screw fixation was similar in both groups. The stiffness after one- and two-screw fixation was not restored to normal: the mean shear stiffness restored ratio was less than 50% and the mean torsional stiffness restored ratio was less than 6% in both groups. BMD did not corre...Continue Reading

References

Jul 1, 1992·Spine·M B SchafflerS R Garfin
Aug 1, 1992·Spine·J G HellerS R Garfin
Oct 1, 1991·Spine·S I Esses, D A Bednar
Jun 1, 1991·Journal of Spinal Disorders·B JeanneretF Magerl
Jun 1, 1991·Spine·R H WittenbergW C Hayes
Jul 1, 1988·Spine·M PanjabiH U Bueff
Aug 1, 1987·The Journal of Trauma·A D Hanssen, M E Cabanela
Nov 1, 1994·Spine·T L HalvorsonS D Cook
Oct 15, 1993·Spine·M H Heggeness, B J Doherty
Nov 7, 1999·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·E J MüllerG Muhr
Jun 29, 2000·The Journal of Bone and Joint Surgery. British Volume·A D HenryA Grosse
Sep 30, 2000·Journal of Neurosurgery·R I ApfelbaumA Casey
Jan 2, 2001·Journal of Spinal Disorders·H ElSaghir, H Böhm
Feb 22, 2005·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Palaniappan LakshmananKathleen Lyons
Mar 3, 2005·Journal of Neurosurgery. Spine·Jonathan S HottNeil R Crawford
Mar 3, 2005·Journal of Neurosurgery. Spine·Christopher P AmesVolker K H Sonntag
Sep 17, 2005·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Matthias GebauerMichael Amling
Mar 28, 2006·Neurology India·Ganesh Rao, Ronald I Apfelbaum
Jul 25, 2006·Neurosurgical Focus·T D JulienT C Ryken
Aug 3, 2007·The Journal of Bone and Joint Surgery. American Volume·Patrick PlatzerChristian Gaebler
Nov 13, 2008·The Journal of Trauma·Iona Collins, Woo-Kie Min

❮ Previous
Next ❯

Citations

Mar 12, 2016·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Christoph JostenUlrich J Spiegl
Feb 11, 2018·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Lívia Gaspar FernandesOlavo Biraghi Letaif
Feb 15, 2017·Case Reports in Medicine·L LeitnerR Radl
Jan 20, 2021·BMC Musculoskeletal Disorders·Yan WangHaijiang Lu

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.