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J Foot Ankle Surg. 2015 Sep-Oct;54(5):905-9. doi: 10.1053/j.jfas.2015.04.002. Epub 2015 May 19.

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

Author information

1
Assistant Professor, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey. Electronic address: karakasliahmet@gmail.com.
2
Associate Professor, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey.
3
Orthopedist Research Assistant, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey.
4
Biomechanics Research Assistant, Department of Biomechanics, Institute of Health Sciences, Dokuz Eylul University, Izmir, Turkey.
5
Professor, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey.

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.

KEYWORDS:

headless screw; locking plate; talar neck fractures

PMID:
25998471
DOI:
10.1053/j.jfas.2015.04.002
[Indexed for MEDLINE]

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