Biomechanics of the Ilizarov external fixator

The Ilizarov external fixator exhibits more isotropic mechanical properties in bending and nonlinear axial stiffness than do unilateral and bilateral external fixators. Each frame element--wire size, tension, and orientation, as well as ring type--contributes to overall frame rigidity and stability. These factors and the specific clinical situation must be considered for the successful application of the Ilizarov fixator.