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THREE-DIMENSIONAL (3D) MODELLING OF THE ANKLE
IMPLANTS
By Dr. S. P. ANGELINE KIRUBHA
Assistant Professor(Sr.G) Department of Biomedical Engineering
School of Bioengineering
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To construct Customized Ankle Implant and conventional ankle Implant
Aim
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To construct the 3D model of the Ankle joint.
To design the conventional Ankle implant To design the New Wave Implant To perform stress analysis for both the
implant. To perform the comparison of stresses for
both the implants.
Objective
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Need For Ankle Implant
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In the field of sports and rehabilitation and pathological situation the Ankle implant helps the patient to walk on his own legs.
The New WAVE implant helps the patient to move ankle joint like original ankle.
Need For Ankle Implant
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Patient CT Scan MIMICS Geomagics Catia ProE Hypermesh Ansys
Requirements
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Experimental Procedure
IMPORT
Geomagic Surface Generation from point cloud
ProE for design and Drafting of implant
ProE for Fitting of implantHypermesh for quality meshingMaterial assignment based on ISO standardsValidation(stress test) using Ansys
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Segmentation in MIMICS
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65 year old Woman with Arthrities
65 years old lady with Arthrities was taken into study.
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65 year old Woman with Arthritis
Internal ViewExternal ViewHypersensitivity Type 3 reaction leads to joint inflamation
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Import Mimics Data Gemagics
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Surface Generation in Geomagics
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loosening 22-75%◦ greater in constrained designs◦ cemented prosthesis
wound complications with subsequent infection◦ amputation rate not insignificant
ankylosis following arthroplasty difficult salvage including arthrodesis
Modes of Failure of Ankle Arthroplasty
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2D Drawing of STAR Ankle ImplantAnd Drafting in ProE For Polymer Component
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2D Drawing of STAR Ankle ImplantAnd Drafting in ProE For Talar Component
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2D Drawing of STAR Ankle ImplantAnd Drafting in ProE For Tibia Component
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3D View of STAR Implant Created in ProE
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3D Modelling of Tibia Component oF WAVE Implant
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3D Modelling of Cartilage Component Component oF WAVE Implant
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3D Modelling of TalusComponent oF WAVE Implant
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Cutting of The Bone to Fix Implant
3mm
3mm
D6
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The Implant are Fixed in the Bone
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Fits like lock and key No restriction in motion Patient specific Cheap New Doctors Can Easily Fit it The implant is made for the old women
considering her physical activity like it is under stood that she cannot jump from a height she can do her daily life activity but the sports man can do many activity
Advantage of Wave implant
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Meshing in Hypermesh as per CT image
CT image Measurement
Intact Model STAR implant Fitted Model
WAVE implant Fitted Model
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Axis of Rotation in Talar Joint
Intact Model STAR implant Fitted Model
WAVE implant Fitted Model
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Material PropertiesComponent Material Young’s
Modulus E (Mpa)
Poisson’s Ratio,V
Cortical Bone 19000 0.3Trabecular Bone 500 0.3
Cartilage 1 0.4Interosseous Membrane
99.5 0.49
Polyethylene Component
UHMWPE 557 0.46
Talar and Tibia component of (STAR)
Co-Cr-Mo 210000 0.3
Talar and Tibia component of (WAVE)
Ti 110000 0.33
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Force Acting on Tibia and Fibula
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Moment Acting on Tibia and Fibula
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FE model with boundary condition
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Finite Element Analysis After meshing the the geometry contains
finite number of elements and Vonmises stress is applied as it acts on all the directions
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Intact Model
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Star Implant
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Wave Implant
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Position Neutral(0 degree)Concentrated Force(N)Z-Component(axial Force) 1343.27Y-Component(anterior –posterior Force)
-144.116
X-Component (interior – Exterior Force)
220.303
Moment (N)Z-Component(axial Torque) -2172.71
Y-Component(anterior –posterior Torque)
10103.8
X-Component (interior – Exterior Torque)
31151.1
Force and Momentum applied To the Tibia in Neutral Position(0 degree)
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Intact Model
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Star Implant
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Wave Implant
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Discussion Load By Arvicar work
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Discussion Load by Sofia Work
Intact Model
Star Implant
Wave Implant
0 50 100 150
Maximum StressMinimum Stress
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The total ankle arthroplasty (TAA) is an alternative procedure to the arthrodesis as the cartilage cannot grow and damaged cartilage leads to pain. In the treatment of advanced arthritis in the ankle joint and joint damage due to physical injury, total ankle arthroplasty (TAA) is an alternative procedure
The use of CAD and CAM helps us to make the bone joint like the original one
Conclusion
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Thank You
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[1] van den Heuvel, A., Van Bouwel, S., and Dereymaeker, G., Total ankle replacement. Design evolution and results. Acta Orthop Belg, 2010. 76(2): p. 150-61.
[2] American Academy of Orthopaedic Surgeons [cited 2013 February 16]; Available from: http://orthoinfo.aaos.org/topic.cfm?topic=A00214.
[3] PubMed Health Home. [cited 2013 February 16]; Available from: http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0002223.
[4] WebMD®. [cited 2013 February 16]; Available from: http://www.webmd.com/osteoarthritis/guide/arthritis-basics.
[5] Arhritis Foundation®. [cited 2013 February 16]; Available from: http://www.arthritis.org/conditions-treatments/understanding-arthritis/.
[6] Centers for Disease Control and PreventionTM [cited 2013 February 16]; Available from: http://www.cdc.gov/arthritis/basics/osteoarthritis.htm.
[7] Chou, L.B., Coughlin, M.T., Hansen, S., Jr., Haskell, A., Lundeen, G., Saltzman, C.L., and Mann, R.A., Osteoarthritis of the ankle: the role of arthroplasty. J Am Acad Orthop Surg, 2008. 16(5): p. 249-59.
Refrences