Title: Topology optimisation of transtibial prosthesis socket using finite element analysis

Authors: Chitresh Nayak; Amit Singh; Himanshu Chaudhary

Addresses: Department of Mechanical Engineering, Malaviya National Institute of Technology, Jaipur, India ' Department of Mechanical Engineering, Malaviya National Institute of Technology, Jaipur, India ' Department of Mechanical Engineering, Malaviya National Institute of Technology, Jaipur, India

Abstract: The objective of this work is to identify optimum pressure distribution of the prosthetic socket under specific load using finite element analysis (FEA). In addition, this study includes the topology optimisation of the socket using Altair's OptiStruct software. The socket needs to be flexible, but strong, to permit normal gait movement, but not twist/bend under pressure. Plaster of Paris (PoP) sockets of different clinical cases and below knee (BK) amputees having different stump geometries have been considered in this paper. The CAD model is developed by using point cloud data and meshing approach used for creating a volume mesh. The quantification of location, intensity and distribution of stress-strain on the socket leads to improved socket design. The proposed method redesigns the socket to improve patient comfort using FEA along with reverse engineering techniques. Further, the patients would feel comfortable with lightweight due to customised prosthetic sockets. The results of the study are in sync with the available literature.

Keywords: CAD model; FE analysis; limb-socket interface; residual limb; topology optimisation.

DOI: 10.1504/IJBET.2017.085438

International Journal of Biomedical Engineering and Technology, 2017 Vol.24 No.4, pp.323 - 337

Received: 07 Mar 2016
Accepted: 04 Jul 2016
Published online: 26 Jul 2017 *

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