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Use of the AO/ASIF external fixator in children.

Sixteen children with 20 fractures were treated with the AO/ASIF tubular fixator (Synthes, Ltd., Paoli, PA). Most of the fractures were open, but the fixator was also used in closed fractures in children with head injuries or other forms of trauma. There were 10 fractures of the tibia, 5 of the femur, 3 of the pelvis, and 2 involving the humerus. Average follow-up was 26 months, with the fixators in place for an average of 7 weeks. Fracture union occurred after an average of 16 weeks. This system is easier to apply, less complicated, and lighter than other types of fixators.

Adolescent↗
PubMed1990

Stiffness characteristics of the circular Ilizarov device as opposed to conventional external fixators.

Ilizarov proposes the use of a special circular fixation device for treatment of bone defects and nonunions or for limb lengthening. Supposition was that the success of this method has to do with the specific mechanical behavior of the device. This behavior is a result of the configuration of the fixation elements. Therefore, a mechanical study of the sensitivity of the circular compression and distraction device (CDD) to configuration parameters was performed. The CDD was found to exhibit a nonlinear stiffness behavior, in particular under axial load. This may be favorable for the induction and tolerance of bone formation. Among the different parameters tested the ring radius was the most important with respect to stiffness. In general, the stiffness of the CDD allows adjustment during postoperative management. In magnitude, it is equal or lower when compared to other fixator types.

Equipment Design↗