3D Finite Element Analysis of Bone Stress around Distally Osteointegrated Implant for Artificial Limb Attachment

Abstract:

Stress shielding, which occurred always around traditional one part implant applied for prosthetic artificial lower limb attachment, would cause osteoporosis and thus result in the loose and extrusion, and then the malfunction of the implant. To improve the structure of the implant, a new type of implant—multi-part implant was developed in this article. Based on CT data and under the maximal load during a normal walking cycle, 3D finite element analysis (FEA) was carried out to analyze the stress of bone around the new implant in three cases of distally truncated femur at high position、middle-position and low-position. Results reveal that stress shielding and stress concentration under the new type of implant reduced effectively compared with the traditional one-part implant, and the stress distribution is much close to the natural bone. Application for distally truncated femur at middle-position and low-position was much better, while stress concentration was marked at high-position. Meanwhile, the stability in vivo can also be maintained with the multi-part implant. The new implant is promising applied for prosthetic limb.

• Periodical: Key Engineering Materials (Volumes 288-289)
• Pages: 653-656
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.288-289.653
• Online since: June 2005
• Authors: L. Zheng, J.M. Luo, Bang Cheng Yang, Ji Yong Chen, Xing Dong Zhang
• Keywords: 3D FEA, FE Model of Femur, Maximal Load, Osseointegrated Implant

References

[1] W Xu, A D Crocombe and S C Hughes. Finite element analysis of bone stress and strain around a distal osseointegrated implant for prosthetic limb attachment. Proc Instn Mcch Engns, 2000, Vol. 214 (Part H), pp.595-202.

DOI: 10.1243/0954411001535624

[2] Harrie Weinans & Dale R. Sumner. Finite element analyses to study periprosthetic bone adaption. Bone research in biomechanics. IOS Press, 1997, pp.3-16.

[3] J.H. Kuiper. Numerical optimization of artificial hip joint designs. ISBN 90-9005958-X, Ph.D. Thesis University Nijmegen, The Netherlands, (1993).

00E+00.

[5] 00E+07.

[1] 00E+08.

[1] 50E+08.

[2] 00E+08.

[2] 50E+08.

[3] 00E+08.

[3] 50E+08.

[4] 00E+08 0 10 20 30 40 Distal Distance/cm Proximal von Mises stress/Pa a1 b1 a2 b2 a3 b3 bone.

00E+00.

[5] 00E+07.

[1] 00E+08.

[1] 50E+08.

[2] 00E+08.

[2] 50E+08.

[3] 00E+08 0 5 10 15 20 25 30 35 40 Distal Distance/cm Proximal von Mises stress/Pa a1 b1 a2 b2 a3 b3 bone Fig. 6 Path plots of stress distribution along femur at different amputated position (A) from front side of femur (B)from back side of femur (B).