Author(s): Hansen M, Le L, Wertheimer S, Meyer E, Haut R, Hansen M, Le L, Wertheimer S, Meyer E, Haut R, Hansen M, Le L, Wertheimer S, Meyer E, Haut R, Hansen M, Le L, Wertheimer S, Meyer E, Haut R
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Abstract The effect of shear stress on a fixated distal syndesmosis of the ankle was evaluated with a servohydraulic materials-testing machine. Eighteen syndesmoses were fixated in a quadricortical technique using 3.5-mm cortical and 4.5-mm cortical stainless steel screws. A shear stress was applied via an axial load in an attempt to simulate weightbearing. The 4.5-mm quadricortical screws produced a higher yield load and peak load (484.3 +/- 93.8 N and 597.7 +/- 81.4 N) when compared with the 3.5-mm quadricortical syndesmotic screws (412.8 +/- 55 N, P = .033 and 511.2 +/- 64.4 N). These findings suggest that a larger diameter screw provides greater resistance to an applied shear stress at the distal syndesmosis.
This article was published in J Foot Ankle Surg
and referenced in Journal of Arthritis