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Device for Collecting Stress Images of Subtalar Joint

Device for Collecting Stress Images of Subtalar Joint. Patrick Melton Daniel Escobar 12/2/10. Introduction.

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Device for Collecting Stress Images of Subtalar Joint

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  1. Device for Collecting Stress Images of Subtalar Joint Patrick Melton Daniel Escobar 12/2/10

  2. Introduction • It is difficult to determine if the subtalar joint is unstable through current methods of examination due to the cost and difficulty of use of the equipment necessary to make reliable measurements. • Producing radiographs to allow for accurate measurements of the subtalar joint for stability analysis has been refined for more practical uses.

  3. Purpose • Create a device that will align the subtalar joint to allow for the best possible radiograph and measurements to determine the stability of the joint.

  4. Hindfoot Anatomy

  5. Literature Review – Radiography

  6. Cobey View Reilingh, M., Beimers, L., Tuijthof, G., Stufkens, S., Maas, M., & van Dijk, C. (2010). Measuring hindfoot alignment radiographically: the long axial view is more reliable than the hindfoot alignment view. Skeletal Radiology, 39(11), 1103-1108.

  7. Long Axial Alignment View • Most reliable and accurate measurements, highest correlation coefficients. • Reilingh, M., Beimers, L., Tuijthof, G., Stufkens, S., Maas, M., & van Dijk, C. (2010). Measuring hindfoot alignment radiographically: the long axial view is more reliable than the hindfoot alignment view. Skeletal Radiology, 39(11), 1103-1108.

  8. Current Progress • Weekly meetings with project advisors discussing literature review, conceptual designs, and future objectives. • Literature Review • Subtalar joint anatomy • Methods of radiographing the subtalar joint for best possible measurements. • Telos device – same concept but difficult to use.

  9. Current Progress (cont’d.) • Considering conceptual designs for stress device • Meeting with Portsmouth Naval Surgeon to discuss potential design ideas • Modeling preliminary designs in Solid Works

  10. Design Considerations • Design allows for inversion of the calcaneus for hindfoot assessment in weight bearing position. Price, Mark. (Designer). (2006). Measuring hindfoot with dynastat. [Web]. Retrieved from http://www.gp-training.net/rheum/gait/gait2.jpg

  11. Design Considerations (Ctd) • Applies non-weight bearing inversion stress. • Allows for analysis of subtalar tilt angle. Brantigan, JW, Pedegana, LR, Lippert, FGInstability of the subtalar joint. Diagnosis by stress tomography in three casesJ Bone Joint Surg Am 1977 59: 321-324

  12. Initial Design

  13. Initial Design (Ctd)

  14. Future Objectives • Model the designs in Solid Works and analyze Finite Element model for stresses and factors of safety. • Discuss designs with advisors and make any necessary modifications. • Determine materials needed for constructing device and the cost of the design.

  15. Schedule

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