The Ortho-SUV frame (OSF) is a novel hexapod\ncircular external fixator which draws upon the innovation\nof the Ilizarov method and the advantages of\nhexapod construction in the three-dimensional control of\nbone segments. Stability of fixation is critical to the success\nor failure of an external circular fixator for fracture or osteotomy\nhealing. In vitro biomechanical modelling study\nwas performed comparing the stability of the OSF under\nload in both original form and after dynamisation to the\nIlizarov fixator in all zones of the femur utilising optimal\nframe configuration. A superior performance of the OSF in\nterms of resistance to deforming forces in both original and\ndynamised forms over that of the original Ilizarov fixator\nwas found. The OSF shows higher rigidity than the Ilizarov\nin the control of forces acting upon the femur. This suggests\nbetter stabilisation of femoral fractures and osteotomies\nand thus improved healing with a reduced\nincidence of instability-related bone segment deformity,\nnon-union and delayed union.
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