By Dr. S. P. ANGELINE KIRUBHAAssistant Professor(Sr.G) Department of Biomedical Engineering School of Bioengineering

1. By
Dr. S. P. ANGELINE KIRUBHA
Assistant Professor(Sr.G)
Department of Biomedical Engineering
School of Bioengineering

2. To construct Customized Ankle Implant and
conventional ankle Implant

3.  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.

5.  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.

6.  Patient
 CT Scan
 MIMICS
 Geomagics
 Catia
 ProE
 Hypermesh
 Ansys

7. IMPORT
Geomagic Surface Generation from
point cloud
ProE for design and Drafting of
implant
ProE for Fitting of implantHypermesh for quality meshing
Material assignment based on ISO
standards
Validation(stress test) using Ansys

9. 65 years old lady with
Arthrities was taken
into study.

10. Internal ViewExternal View
Hypersensitivity Type 3 reaction
leads to joint inflamation

13.  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

21. 3mm
3mm
D6

23.  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

24. CT image
Measurement
Intact Model
STAR implant
Fitted Model
WAVE implant
Fitted Model

25. Intact Model STAR implant Fitted
Model
WAVE implant
Fitted Model

26. Component Material Young’s Modulus
E (Mpa)
Poisson’s Ratio,V
Cortical Bone 19000 0.3
Trabecular Bone 500 0.3
Cartilage 1 0.4
Interosseous
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

30. After meshing the the geometry contains
finite number of elements and Vonmises
stress is applied as it acts on all the
directions

35. Position Neutral(0 degree)
Concentrated Force(N)
Z-Component(axial Force) 1343.27
Y-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

40. 0 50 100 150
Intact Model
Star Implant
Wave Implant
Maximum Stress
Minimum Stress

41.  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

43. [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.