New Technique for Tibiotalar Arthrodesis Using a NewIntramedullary Nail Device: A Cadaveric Study

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