title: 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 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.
authors.affiliation: Assistant Professor, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey. Electronic address: karakasliahmet@gmail.com.
authors.forename: Ahmet
authors.initials: A
authors.lastname: Karakasli
authors.affiliation: Associate Professor, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey.
authors.forename: Onur
authors.initials: O
authors.lastname: Hapa
authors.affiliation: Associate Professor, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey.
authors.forename: Mehmet
authors.initials: M
authors.lastname: Erduran
authors.affiliation: Orthopedist Research Assistant, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey.
authors.forename: Cemal
authors.initials: C
authors.lastname: Dincer
authors.affiliation: Biomechanics Research Assistant, Department of Biomechanics, Institute of Health Sciences, Dokuz Eylul University, Izmir, Turkey.
authors.forename: Berivan
authors.initials: B
authors.lastname: Cecen
authors.affiliation: Professor, Department of Orthopaedics and Traumatology, Dokuz Eylul University Faculty of Medicine, Izmir, Turkey.
authors.forename: Hasan
authors.initials: H
authors.lastname: Havitcioglu
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001696:Biomechanical Phenomena; D001860:Bone Plates; D001863:Bone Screws; D002102:Cadaver; D004867:Equipment Design; D004869:Equipment Safety; D005593:Fracture Fixation, Internal / Q000295:instrumentation* / Q000379:methods; D050723:Fractures, Bone / Q000601:surgery*; D006801:Humans; D008875:Middle Aged; D012680:Sensitivity and Specificity; D013628:Talus / Q000293:injuries / Q000601:surgery*; D013718:Tensile Strength
keywords: headless screw; locking plate; talar neck fractures