Primary stability of uncemented acetabular liner of a total hip prosthesis using an axisymmetric finite element method based on computed tomography

8th International Conference on Advanced Concepts in Mechanical Engineering

Capitanu, L.^1 ; Badita, L.L.^2 ; Florescu, V.^3

Institute of Solid Mechanics of the Romanian Academy, Bucharest, Romania^1

National Institute of Research and Development for Mechatronics and Measurement Technique, Bucharest, Romania^2

Institute of Civil Engineering, Bucharest, Romania^3

关键词: Acetabular components;    Acetabular liners;    Axisymmetric finite element methods;    Contact parameters;    Optimization algorithms;    Primary stabilities;    Short term stability;    Total hip prosthesis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/444/3/032001/pdf
DOI  :  10.1088/1757-899X/444/3/032001

来源: IOP

【 摘 要 】

Primary stability has a great influence on behaviour during day-to-day activities and on the long-term success of uncemented acetabular components. Achieving this stability by pushing the acetabular bush (uncemented fixation) is a common practice today. In this paper, it was tried to establish a criterion for the success of fixing the acetabular cup by evaluating the short-term stability. The influence of the contact parameters established between the cup and the peripheral area of the acetabulum was investigated in this paper. These parameters depend on the intraoperative procedures: reaming and fixation. Reaming is considered without residual stress, but the acetabulum has been remodelled (a sphere has been adapted through an optimization algorithm). Uncemented fixation (press fit) involves a series of load impulses applied to the cup, simulating the impact strokes through the surgeon's hammer. Finite Element Method (FEM) was used for this simulation along with a pelvis model based on computed tomography (CT) data. Consequently, there is a postoperative state of residual effort. Assessing this state of effort could lead to a good estimation of short-term stability.