文摘
Total joint arthroplasty is regarded as a significant advance in the treatment of painful and disabling joint pathologies. Ceramic-on-ceramic (CoC) artificial joints have been shown to produce substantially less wear debris than traditional metal-on-polyethylene bearings. However, with the recent increase in popularity of CoC bearing, postoperative audible squeaking has become a recognized clinical complication. Although the nature of squeaking is a multifactorial combination of interaction among patient, surgery and implant, it is generally agreed that friction is the driving force inducing the vibration and sound emission. Thus, biotribologically induced acoustic issues have become the new problems for CoC artificial joints. In this study, a finite element model containing human pelvis, ceramic hip endoprosthesis and femur is established to analyze the mechanism of clinical squeaking phenomenon in CoC artificial joints. Complex eigenvalue method is used to study friction-induced dynamic response of the whole model. By comparing the vibration characteristics of all the components, the generation mechanism of squeaking is discussed. Results show that the main cause of the squeaking is the bending and torsional resonance of the femoral component, while pelvis is involved in the sound emission as well. Keywords Ceramic on ceramic Squeaking Artificial joint Pelvis