Journal
COMPUTER METHODS IN BIOMECHANICS AND BIOMEDICAL ENGINEERING
Volume 26, Issue 5, Pages 548-558Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/10255842.2022.2073788
Keywords
Decomposition; micromotion; fretting mode; head-neck interface; finite element modelling
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This study decomposed the complex three-dimensional micromotion at the head-neck junction of modular hip prostheses and revealed the main forms of micromotion and their relationship with motion state. The findings provide design considerations for further experimental testing and facilitate the understanding of fretting mechanisms in hip prostheses.
Fretting corrosion as one of the leading causes for failure of modular hip prostheses has been associated with micromotion at head-neck taper junction. Decomposition of micromotion is helpful to promote the development of more realistic experiments investigating failure mechanisms of the head-neck junction in total hip arthroplasty. The aim of this study was to decompose the complex three-dimensional micromotion at the head-neck junction into multiple fundamental modes, including three translational and three rotational components. A three-dimensional finite element model composed of head-neck junction, liner and acetabular cup with a typical 12/14 taper size, as well as the taper mismatch of -4', was developed during walking. The analysis was divided into three procedures: a) the assembly simulation of the head and neck during surgery, b) verification with a simplified axisymmetric model, and c) three-dimensional modelling under normal walking. This study revealed that the main forms of micromotion contained circumferential, longitudinal micromotion and longitudinal rolling toggling, and were closely related to the state of motion. The maximum translational micromotion was predicted to be 10.9 mu m during the walking gait, with the predominant modes of the circumferential translation of 9.6 mu m, the longitudinal translation of 5.5 mu m and the longitudinal rotation of 0.29 degrees along the taper junction. These findings may provide design considerations for further experimental testing about fretting and facilitate the understanding of the fretting mechanisms in hip prostheses.
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