Design and Analysis of a Topology Optimized Transtibial Prosthetic Socket Using Combined Static Gait Analysis

Date
2022
Authors
Carbonell, R.M.
Crawford, R.H.
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Abstract

This paper presents the design and analysis of an optimized transtibial prosthetic socket developed using the ground structure method of topology optimization (GSM). The socket wall between the distal 25% of the original socket and a proximal brim is replaced with an optimized truss geometry and a thin wall (1 mm). Separate trusses are developed for the loading conditions of three critical stances: heel strike, vertical (standing), and toe-off. The truss models are combined with critical components to create the final design. The proposed socket is 81.58% of the original socket volume and is designed for manufacturing using Selective Laser Sintering (SLS) and nylon- 12. The socket design is analyzed, with the material properties for sintered nylon-12, at 10% increments between heel strike and toe-off to determine the viability of both the socket and the corresponding methodology. Simulation results indicate that the design exceeds requirements for all tested stances.

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