Mechanical Comparison of Headless Screw Fixation and Locking Plate Fixation for Talar Neck Fractures

Abstract For talar neck fractures, open reduction and internal fixation have been thought to facilitate revascularization and prevent osteonecrosis. Newer screw systems allow for placement of cannulated headless screws, which provide compression by virtue of a variable pitch thread. The present stud...

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Bibliographic Details
Published in:The Journal of foot and ankle surgery 2015-09, Vol.54 (5), p.905-909
Main Authors: Karakasli, Ahmet, MD, Hapa, Onur, MD, Erduran, Mehmet, MD, Dincer, Cemal, MD, Cecen, Berivan, PhD, Havitcioglu, Hasan, MD
Format: Article
Language:English
Subjects:
Adult
Aged
Aged, 80 and over
Biomechanical Phenomena
Bone Plates
Bone Screws
Cadaver
Equipment Design
Equipment Safety
Fracture Fixation, Internal - instrumentation
Fracture Fixation, Internal - methods
Fractures, Bone - surgery
headless screw
Humans
locking plate
Middle Aged
Orthopedics
Sensitivity and Specificity
talar neck fractures
Talus - injuries
Talus - surgery
Tensile Strength
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Summary:Abstract For talar neck fractures, open reduction and internal fixation have been thought to facilitate revascularization and prevent osteonecrosis. Newer screw systems allow for placement of cannulated headless screws, which provide compression by virtue of a variable pitch thread. The present study compared the biomechanical fixation strength of cannulated headless variable-pitch screw fixation and locking plate fixation. A reproducible talar neck fracture was created in 14 fresh cadaver talar necks. Talar head fixation was then performed using 2 cannulated headless variable-pitch 4-mm/5-mm diameter (4/5) screws (Acutrak; Acumed, Hillsboro, OR) and locking plate fixation. Headless variable-pitch screw fixation had lower failure displacement than did locking plate fixation. No statistically significant differences were found in failure stiffness, yield stiffness ( p  = .655), yield load ( p  = .142), or ultimate load between the 2 fixation techniques. Cannulated headless variable-pitch screw fixation resulted in better failure displacement than locking plate fixation in a cadaveric talus model and could be considered a viable option for talus fracture fixation. Headless, fully threaded, variable-pitch screw fixation has inherent advantages compared with locking plate fixation, because it might cause less damage to the articular surface and can compress the fracture for improved reduction. Additionally, plate fixation can increase the risk of avascular necrosis owing to the wider incision and dissection of soft tissues.
ISSN:1067-2516
1542-2224
DOI:10.1053/j.jfas.2015.04.002