Journal article
Scaphoid Fracture Fixation in a Nonunion Model: A Biomechanical Study Comparing 3 Types of Fixation
A Mandaleson, SK Tham, C Lewis, DC Ackland, ET Ek
Journal of Hand Surgery | W B SAUNDERS CO-ELSEVIER INC | Published : 2018
Abstract
Purpose: Union of a scaphoid fracture after fixation is influenced by various factors, one of which is fracture stability. This study aims to compare the biomechanical stability of 3 different types of scaphoid fracture fixation in a scaphoid nonunion model. Methods: Thirty cadaveric scaphoid specimens were assigned to one of 3 different fixation groups: (1) single 3.0-mm compression screw, (2) two 2.2-mm screws, and (3) scaphoid plate. A 3-mm volar wedge osteotomy was created at the scaphoid waist to simulate a nonunion model. The primary outcome measure was load to failure, whereas secondary outcome measures were load to 2-mm displacement, energy absorbed, stiffness, and mode of failure, r..
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Funding Acknowledgements
We gratefully acknowledge the AOA (Australian Orthopaedic Association) for a Research Grant received in support of this study. We acknowledge Conmed Linvatec for donating power tools used in preparation of the cadaveric specimens. Scaphoid screws and plates used in this project were provided by Medartis, who exercised no control over the conduct of this study. We also acknowledge Michael Tham for preparing the digital illustrations.