device for collecting stress images of subtalar joint n.
Download
Skip this Video
Loading SlideShow in 5 Seconds..
Device for Collecting Stress Images of Subtalar Joint PowerPoint Presentation
Download Presentation
Device for Collecting Stress Images of Subtalar Joint

Loading in 2 Seconds...

play fullscreen
1 / 20

Device for Collecting Stress Images of Subtalar Joint - PowerPoint PPT Presentation


  • 57 Views
  • Uploaded on

Device for Collecting Stress Images of Subtalar Joint. Final Presentation Patrick Melton Daniel Escobar 4/26/11. Hindfoot Anatomy. Purpose.

loader
I am the owner, or an agent authorized to act on behalf of the owner, of the copyrighted work described.
capcha
Download Presentation

PowerPoint Slideshow about 'Device for Collecting Stress Images of Subtalar Joint' - marny-mcfarland


Download Now An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -
Presentation Transcript
device for collecting stress images of subtalar joint

Device for Collecting Stress Images of Subtalar Joint

Final Presentation

Patrick Melton

Daniel Escobar

4/26/11

purpose
Purpose
  • Create a device that will apply stress to the subtalar joint for the best possible radiographic images to allow for accurate measurements and determine the stability of the joint.
cobey view
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.

long axial alignment view
Long Axial Alignment 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.
final design
Final Design
  • 30 degree plate inclination with additional forefoot plate that rotates 15 degrees.
  • Sliding heelcup plate for various foot sizes.
  • Allows for footstraps to be placed in multiple areas.
final design1
Final Design
  • Utilizes two bolts that act as columns to angulate the foot for optimal positioning of the subtalar joint.
dimensions bolts
Dimensions - Bolts

15°

Ø 0.5” UNF – 20 Hex Head bolt

Ø 1.125” UNF – 12 Hex Head bolt

dimensions hinges

Hinge:

Ø 0.5” Outer

Ø 0.25” Inner

Dimensions - Hinges

Hinge:

Ø 1.0” Outer

Ø 0.5” Inner

Shoulder screw - Ø ½”,

3/8”–16 thread with matching nut.

Shoulder screw – Ø ¼”

#10–24 thread with matching nut.

finite element analysis foot plate
Finite Element Analysis – Foot Plate
  • Max Displacement: .0618 in.
finite element analysis foot plate1
Finite Element Analysis – Foot Plate
  • Max Stress: 2550 psi
  • Safety Factor: 3.92
finite element analysis base plate
Finite Element Analysis – Base Plate
  • Max Displacement: .0362 in.
finite element analysis base plate1
Finite Element Analysis – Base Plate
  • Max Stress: 1180 psi
  • Safety Factor: n = 8.47
finite element analysis forefoot plate1
Finite Element Analysis – Forefoot Plate
  • Max Stress: 8970 psi
  • Safety Factor: n = 1.12
materials selection
Materials Selection
  • Most of the device will be made from a radiolucent plastic called Delrin, manufactured by DuPont.
    • Tensile strength – 400 ksi
    • Yield Strength – 10 ksi
    • Density – 1.42 g/cm3
  • Footstraps made from Nylon
  • Foam padding (Lux-R-Foam) on sliding plate, forefoot plate, and in heelcup.