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Final Deliverables

THE PROBLEM:
BEFORE
Art Vanderlay has osteoarthritis in his right hip, which developed from his underlying hip dysplasia. He experiences immense pain which is interfering with his ability to be independent in post-secondary school. He requires a hip implant, however due to his hip dysplasia, his right leg is
2.5 cm shorter than his left. Since this difference in leg lengths is not accounted for in most commercial implants, Art needs a unique implant that will meet his needs.
OUR SOLUTION:
Our proposed solution, the Bone Booster, is a cement-less hip resurfacing device featuring a uniquely shaped acetabular cup and textured stem on the femoral cap. The shape of the acetabular cup serves to accommodate for Art's difference in leg lengths by shifting his right femur downwards. The textured stem on the femoral cap promotes bone growth into the implant, also known as osseointegration, to better secure it within the body without the use of cement.
​
A hip resurfacing device was chosen over a total hip arthroplasty to preserve bone. Due to Art's young age (19 years old), given the typical lifespan of hip implants (20 years), it is highly probable that Art would require a replacement in his lifetime. By preserving more bone in this hip resurfacing, it will be easier for him to receive a total hip arthroplasty should he need one in the future.
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AFTER
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3d-printed Final prototype

The components of the Bone Booster prototype were modelled using Autodesk Inventor and 3D printed.

solid model components

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Acetabular Cup
  • fixated to acetabulum with 4 screws
  • made of Ti-6Al-7Nb alloy which is highly biocompatible and wear-resistant
  • direct metal laser sintering is used to 3D print the component with 30-35% porosity to mimic bone density and promote osseointegration
  • plasma electrolytic oxidation is used to coat it with hydroxyapatite to promote osseointegration
  • unique shape to accommodate difference in leg length
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Acetabular Liner
  • reduces friction between the acetabular cup and femoral cap during joint movement
  • made of poly-ether-ether-ketone (PEEK), reinforced with carbon fibres to reduce wear
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Assembly of the Bone Booster
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Femoral Cap
  • inserted into the top of the femur
  • the dome of the cap is made of cobalt-chrome to reduce friction with the acetabular liner
  • selective laser melting is used to create the truss pattern on the surface of the stem to promote osseointegration
  • the stem component of the cap is made of Ti-6Al-7Nb alloy

poster board presentation

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The lovely team behind the Bone Booster!
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From left to right:
James, Marissa, Hamrish, Tammy
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