Please use this identifier to cite or link to this item: https://doi.org/10.15480/882.3720
Publisher DOI: 10.1177/2192568220941443
Title: Lag-screw osteosynthesis in thoracolumbar pincer fractures
Language: English
Authors: Auerswald, Marc 
Messer-Hannemann, Philipp 
Sellenschloh, Kay 
Wahlefeld, Jan 
Püschel, Klaus 
Hirschfeld Araujo, Sven 
Morlock, Michael 
Schulz, Arndt Peter 
Huber, Gerd 
Keywords: biomechanics; human specimen; lag-screw; pincer fracture; spinal fractures; spinal fusion; spine; weightbearing
Issue Date: Sep-2021
Publisher: Sage Publications
Source: Global Spine Journal 11 (7): 1089-1098 (2021-09)
Abstract (english): 
Study Design: Biomechanical. Objective: This study evaluates the biomechanical properties of lag-screws used in vertebral pincer fractures at the thoracolumbar junction. Methods: Pincer fractures were created in 18 bisegmental human specimens. The specimens were assigned to three groups depending on their treatment perspective, either bolted, with the thread positioned in the cortical or cancellous bone, or control. The specimens were mounted in a servo-hydraulic testing machine and loaded with a 500 N follower load. They were consecutively tested in 3 different conditions: intact, fractured, and bolted/control. For each condition 10 cycles in extension/flexion, torsion, and lateral bending were applied. After each tested condition, a computed tomography (CT) scan was performed. Finally, an extension/flexion fatigue loading was applied to all specimens. Results: Biomechanical results revealed a nonsignificant increase in stiffness in extension/flexion of the fractured specimens compared with the intact ones. For lateral bending and torsion, the stiffness was significantly lower. Compared with the fractured specimens, no changes in stiffness due to bolting were discovered. CT scans showed an increasing fracture gap during axial loading both in extension/flexion, torsion, and lateral bending in the control specimens. In bolted specimens, the anterior fragment was approximated, and the fracture gap nullified. This refers to both the cortical and the cancellous thread positions. Conclusion: The results of this study concerning the effect of lag-screws on pincer fractures appear promising. Though there was little effect on stiffness, CT scans reveal a bony contact in the bolted specimens, which is a requirement for bony healing.
URI: http://hdl.handle.net/11420/7698
DOI: 10.15480/882.3720
ISSN: 2192-5690
Journal: Global spine journal 
Institute: Biomechanik M-3 
Document Type: Article
License: CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives) CC BY-NC-ND 4.0 (Attribution-NonCommercial-NoDerivatives)
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