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Stress Application Device for the Subtalar Joint

Stress Application Device for the Subtalar Joint. Status Report 1 Patrick Melton Daniel Escobar. Recap - Objective.

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Stress Application Device for the Subtalar Joint

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  1. Stress Application Device for the Subtalar Joint Status Report 1 Patrick Melton Daniel Escobar

  2. Recap - Objective • The objective is to utilize the research of the medical literature gathered and translate the findings to design a device that will position the ankle for improved visualization of the subtalar joint and allow for enhanced stability analysis.

  3. Recap – Radiographic Views • Cobey view • Hindfoot Alignment view • Long axial view • Stress Broden view

  4. Update – Stress Broden View • Two articles concluded that the Stress Broden view is not ideal for subtalar joint analysis. • Compared subtalar tilt in unstable and normal ankles using Stress Broden view vs. CT scan – measurements were not statistically significant. • Stress Broden view recorded high degree of subtalar tilt in both normal ankles and unstable ankles – accurate measurements could not be obtained.

  5. Roadblocks • How does the subtalar joint act under different areas of stress application? • What is the best way to open the subtalar joint by applying stress to the ankle for an ideal radiographic view?

  6. Possible Solution • Obtain kinematic model of the hindfoot so that we can simulate the application of stress on the subtalar joint. • Forefoot is not included, so it will be difficult to accurately simulate our device using the kinematic model.

  7. Possible Solution • Article used a combination of supination and dorsiflexion. Ishii, T., S. Miyagawa, et al. (1996). "SUBTALAR STRESS RADIOGRAPHY USING FORCED DORSIFLEXION AND SUPINATION." J Bone Joint Surg Br 78-B(1): 56-60.

  8. Update - Design • Should have different size heel cups, or a single adjustable heel cup. • Three layers: Base plate, full foot plate, forefoot plate. • Base plate: foundation for adjustable locking mechanism and heelcup. • Full foot plate: allows for angular adjustment of entire foot, enabling supination. • Forefoot plate: will allow for additional adjustment of forefoot, enabling dorsiflexion.

  9. Device Preliminary Model

  10. Update – Gantt Chart

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