Introduction. Ankle arthrodesis is performed in a variety of methods.We propose a new technique for tibiotalar arthrodesis using a\nnewly designed intramedullary nail. Methods.We proposed development of an intramedullary device for ankle arthrodesis which\nspared the subtalar joint using a sinus tarsi approach. Standard saw bones models and computer assisted modeling and stress\nanalysis were used to develop different nail design geometries and determine the feasibility of insertion. After the final design was\nconstructed, the device was tested on three cadaveric specimens. Results. Four basic nail geometries were developed. The optimal\ndesign was composed of two relatively straight segments, each with a different radius of curvature for their respective tibial and talar\ncomponent. We successfully implemented this design into three cadaveric specimens. Conclusion. Our newly designed tibiotalar\nnail provides a new technique for isolated tibiotalar fusion. It utilizes the advantages of a tibiotalar calcaneal nail and spares the\nsubtalar joint. This design serves as the foundation for future research to include compression options across the tibiotalar joint\nand eventual transition to clinical practice.
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