The evaluation of artificial talus implant on ankle joint contact characteristics: a finite element study based on four subjects

Customized talus implants have been regarded as a better treatment alternative to talus avascular necrosis than traditional surgical fusion because of its ability to maintain joint mobility while ameliorating pain. Despite the use of ankle hemiarthroplasty clinically, the cartilage contact characteristics of adjacent bones remain unclear. This study aims to use finite element modeling to evaluate the contact characteristics of three types of cobalt-chrome talus implants in three postures, in four subjects. This study also compared the contact area, contact pressure, and peak contact pressure of the implant models with a reference biological model. Among the various biological and implant models, our results showed that the biological models generally had the largest contact areas and smallest peak contact pressures, whereas the implant-type models had smaller contact areas and relatively larger peak contact pressure. Moreover, among the three implant types, customized-scale models showed a larger total contact area than that of the SSM-scale and universal-scale models, but their variation was relatively limited. The results from this study can have significance in future endeavors into ankle joint modeling, as well as being able to improve implant design to enhance recovery outcomes for patients who may benefit from talar replacement. Graphical abstract