Finite Element Analysis of External Ilizarov Ring and Hybrid Fixators

The mechanical characteristics of an external fixator determines the biomechanical environment of a fracture, osteotomy or non-union treated by the external fixator Two main categories of fixators are in popular use. The more conventional type (e. g. hybrid). The second type of circular or semicircular fixator e. g. , ilizarov) relies on smooth, non threaded Kirschner wires of small diameter (1.5mm to 1.8mm) under tension to provide the stability needed. Biomechanically, not only are the principles different but also, the biomechanical environment of fractures by the two system is significantly different. Using Ansys Work Bench 10 the Ilizarov, hybrid1and hybrid2 were modeled and it was found that the mechanical properties ilizarov was better than the hybrid fixators.