Effect of geometric parameters in the design of customized hip implants

Abstract

In this paper, the effects of geometric parameters on the development of stress in custom cementless hip implant have been studied. Taguchi methods and analysis of variance (ANOVA) were used to find out which geometric parameters are statistically significant for the maximum von Mises stresses in the hip implant. The multiple regression analysis was also performed, to replace the FE solver and accurately and quickly predict the stress values for new patients. Three parameters horizontal offset (HO), vertical offset and neck shaft angle (NSA), with three levels have been selected. Based on L9 orthogonal array, nine hip implant shapes with three different geometric parameters were modelled. Stress analysis was carried out by using finite element analysis. ANOVA results showed that HO has the maximum impact on von Mises stresses followed by the NSA. It is shown that as the HO increases, the stress at the given region increases, however, as the neck shaft (NSA) increases the stress at the given region decreases. Good agreement is found between von Mises stresses, calculated from multiple regression analysis and obtained from FE analysis. To redesign customised hip implant for the minimum stresses, the results of this work will be important.

Static structural analysis of different stem designs used in total hip arthroplasty using finite element method

“…In this work, the circular shaped profile 1 stem was considered for mesh dependency. Several mesh size was developed by varying the mesh size from 5mm to 0.25mm [22]. The result of different mesh size in terms of stresses developed are presented in Fig.…”

“…Mangesh et al. [22] followed the ISO 7206–4 and ASTM F2996-13 static loading boundary conditions. There is clear lack of uniformity in the type of boundary conditions applied and the type of design and/or material that would be best suitable for hip joint prosthesis.…”

Advancement in total hip implant: a comprehensive review of mechanics and performance parameters across diverse novelties

“…Moreover, Dharme et al reported in ref. 188 that as the shaft angle reduces, the horizontal offset increases, resulting in higher stress at the provided location, and as NSA expands, the stress at the particular region reduces.…”

Comparative Study of Femur Bone Having Different Boundary Conditions and Bone Structure Using Finite Element Method

“…The comprehensive biomechanical properties of the cancellous bone of distal femur are generally accomplished through a series of mechanical tests, comprising of tensile test, compression test, torsion test, shear test, bending test and impact test [2,3]. The accurate determination of biomechanical properties of bone is a precondition and is relevant especially for research related to the design and manufacture of artificial joint, rectification device, and implants [4]. The biomechanical properties obtained from the experimental studies are very sensitive to the test conditions and methods used [5].…”