Numerical study of squeaking suppresses for ceramic-on-ceramic hip endoprosthesis

A finite element model of a ceramic hip endoprosthesis system is established with ABAQUS 6.7 and the motion stability of the model is studied using the complex eigenvalue method. Numerical results reveal that a torsional vibration and a flexural vibration of the femoral component are responsible for squeaking. Increasing Young's modulus of the stem, adding CoCrMo alloy as well as 316L stainless steel in the stem and adding a whole damping layer of UHMWPE to the acetabular component can improve the vibrant stability of the system, then, suppress the squeaking. ► We study the motion stability of a ceramic hip endoprosthesis system. ► Unstable vibration of the femoral component is responsible for squeaking. ► Increasing Young's modulus of the stem can suppress the squeaking, vice versa. ► Adding CoCrMo alloy and 316L stainless steel in the stem can suppress the squeaking. ► Adding a whole damping layer of UHMWPE to the acetabular part can suppress squeaking.