The Sheffield hybrid fixator--a clinical and biomechanical review.

The Sheffield hybrid fixator (SHF) was developed to complement and extend the use of current monolateral fixation systems. Unlike other hybrid designs, it relies on rings for the diaphyseal as well as the metaphyseal support. Since it is an all ring system it may be used to cross joints and perform progressive deformity and contracture correction. Unlike the Ilizarov system only one ring is required at each level and diaphyseal transfixation is avoided. Initial biomechanical testing has demonstrated similar mechanical characteristics to an all wire Ilizarov fixator, however, increased shear motion was noted due to the stiffness asymmetry between the segments controlled by wires and screws. The first 100 cases were reviewed with good patient compliance and satisfactory results. Minor component problems were identified and corrected during this period and no significant complications occurred. The device is recommended for a wide range of complex trauma and limb reconstruction uses.