Design Of Knee Prosthesis and Analysis-Ashish Sharma

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Designed Knee implant by using designing tool Pro-Engineer 5.0 and performed mechanical analysis by using an application PRO-MECHANICA

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Design Of Knee Prosthesis and Analysis-Ashish Sharma

  1. 1. DESIGN OF KNEE PROSTHESIS Ashish Sharma
  2. 2. Common Causes of Knee Pain and Loss of Knee Function ARTHRITIS• Osteoarthritis (wear and tear)• Rheumatoid arthritisPost-traumatic arthritis caused by: • Fractures • Ligament injuries • Meniscus tears
  3. 3. Knee Prosthesis comprised of• Femoral- replaces arthritic portion of thigh bone• Tibial- replaces arthritic portion of shin bone• Tibial insert- replaces cartilage and acts as shock absorber• Patella- replaces knee cap
  4. 4. Types of Knee Prosthesis• Fixed Knee Prosthesis : The more traditional fixed bearing implant which can only flex and extend• Mobile-Bearing Prosthesis: More advanced the rotating platform knee implants move almost like a normal knee joint. They allow the knee to twist and turn (rotation) as well as flex and extend. The Rotating Platform Knee is designed to bend and rotate, move back and forth, flex and extend, helping to accommodate more normal movement.
  5. 5. Design Input KNEE REPLACEMENT SYSTEM byDistal Portion of Femur Amplitude
  6. 6. Design Dimensions
  7. 7. Features• PEGS• PATELLAR FLANGE• GROOVES ON CONDYLES• INTERNAL SUPPORT
  8. 8. METHOD Box cutSketch Rectangle (Right Plane) Anterior plane
  9. 9. SWEEP CUT• Trajectory Cut sweep dialog box Section
  10. 10. Removal of extra materialTop View of Extrude-Cut Posterior Biew
  11. 11. Patellar flangeNew Right Datum Plane Sketch Extrude
  12. 12. Intercondular notch• Sketch Top view Extrude cut Final cut
  13. 13. PEGSSketch(Right plane) Revolve Final Peg
  14. 14. Longitudnal ridges on the condular posterior surface• Sketch from the front view Final ridges
  15. 15. Longitudnal Ridges in PegsSketch Axis Pattern Final Ridge Ridges increase the holding power with bone cement
  16. 16. CUT TOOLFamily table
  17. 17. Rounds• Features1. Variable radii2. Stress prone edges moved before Sweep cut
  18. 18. Component operationTool Cut/ Bone Cuts
  19. 19. Finite Element Analysis (FEA)• Test I : Yield tensile strength test• Test II: Fatigue strength test• Loads were applied on lateral condyle to checkout the strenght in extreme situation
  20. 20. Material Used• Co-Cr-Mo• Material properties Properties Values Tensile strength 855 MPa Yield Strength 650 MPa Fatigue Strength 510 MPa Young’s Modulus 230 GPa Density 8.3 g/Cm^3
  21. 21. Constraints• One end is fixed- Displacement constraint• Other end force given on lateral condyle- Force constraint
  22. 22. Results• Max Stress without rounds
  23. 23. • Max Stress without round
  24. 24. conclusion On rounding the internal edges there is a reduction in stress and it is uniformly distributed
  25. 25. Final Assembly
  26. 26. REFRENCEShttp://www.amplitude-ortho.comhttp://orthoinfo.aaos.org/topic.cfm?topic=a00389http://www.ofc-oregon.comhttp://www.endotec.com
  27. 27. THANK YOU

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