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 316 L 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 316 L stainless steel in the stem can suppress the squeaking.
► Adding a whole damping layer of UHMWPE to the acetabular part can suppress squeaking.