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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Poller or blocking screw
Poller or blocking screws are used to stabilize fractures treated with small diameter intramedullary nails. They guide the nail like "poller" traffic devices guide vehicles. Blocking screws increase stability of distal and proximal metaphyseal fractures after nailing and can help manage malunited fractures. They work by narrowing the canal to guide the nail anteriorly and prevent sagittal plane deformity. Blocking screws are typically placed medially and laterally as close to the fracture as possible for optimal stabilization. Their placement on the concave side of deformities helps improve reduction by deflecting the nail.
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This document discusses approaches to the knee joint and describes the operation of total knee arthroplasty (TKA) in detail. It outlines various approaches to the knee including medial para-patellar, subvastus anteromedial, and anterolateral approaches. It then describes the operative technique of TKA, including preoperative planning, bone cuts of the femur and tibia using cutting guides, and the importance of soft tissue balancing and implant fixation for achieving good results.
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This document discusses femoroacetabular impingement (FAI), a condition where the femoral head and acetabulum abnormally contact each other, from the perspective of a sports physiotherapist. It describes the two main types of FAI - cam impingement caused by a nonspherical femoral head, and pincer impingement caused by excessive acetabular coverage. Most cases involve a mix of both. Conservative physiotherapy management focuses on reducing inflammation, strengthening muscles, and gentle stretching. Surgical intervention like arthroscopy may be considered if conservative treatment fails to allow athletes to return to play.
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Design Of Knee Prosthesis and Analysis-Ashish Sharma
- 1. DESIGN OF KNEE PROSTHESIS Ashish Sharma
- 2. Common Causes of Knee Pain and Loss of Knee Function ARTHRITIS • Osteoarthritis (wear and tear) • Rheumatoid arthritis Post-traumatic arthritis caused by: • Fractures • Ligament injuries • Meniscus tears
- 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. 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. Design Input KNEE REPLACEMENT SYSTEM by Distal Portion of Femur Amplitude
- 7. Features • PEGS • PATELLAR FLANGE • GROOVES ON CONDYLES • INTERNAL SUPPORT
- 8. METHOD Box cut Sketch Rectangle (Right Plane) Anterior plane
- 9. SWEEP CUT • Trajectory Cut sweep dialog box Section
- 10. Removal of extra material Top View of Extrude-Cut Posterior Biew
- 11. Patellar flange New Right Datum Plane Sketch Extrude
- 12. Intercondular notch • Sketch Top view Extrude cut Final cut
- 13. PEGS Sketch(Right plane) Revolve Final Peg
- 14. Longitudnal ridges on the condular posterior surface • Sketch from the front view Final ridges
- 15. Longitudnal Ridges in Pegs Sketch Axis Pattern Final Ridge Ridges increase the holding power with bone cement
- 17. Rounds • Features 1. Variable radii 2. Stress prone edges moved before Sweep cut
- 18. Component operation Tool Cut/ Bone Cuts
- 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. 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. Constraints • One end is fixed- Displacement constraint • Other end force given on lateral condyle- Force constraint
- 22. Results • Max Stress without rounds
- 23. • Max Stress without round
- 24. conclusion On rounding the internal edges there is a reduction in stress and it is uniformly distributed
- 25. Final Assembly
- 27. THANK YOU