Abstract
The hip joint is subjected to cyclic loading and motion during activities of daily living and this can induce micromotions at the bone-implant interface of cementless total hip replacements. Initial stability has been identified as a crucial factor to achieve osseointegration and long-term survival. Whilst fixation of femoral stems achieves good clinical results, the fixation of acetabular components remains a challenge. In vitro methods assessing cup stability keep the hip joint in a fixed position, overlooking the effect of hip motion. The effect of hip motion on cup micromotion using a hip motion simulator replicating hip flexion-extension and a six degrees of freedom measurement system was investigated. The results show an increase in cup micromotion under dynamic hip motion compared to Static Flexion. This highlights the need to incorporate hip motion and measure all degrees of freedom when assessing cup micromotion. In addition, comparison of two press-fit acetabular cups with different surface coatings suggested similar stability between the two cups. This new method provides a basis for a more representative protocol for future pre-clinical evaluation of different cup designs.
Original language | English |
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Pages (from-to) | 717-724 |
Number of pages | 8 |
Journal | Medical Engineering & Physics |
Volume | 38 |
Issue number | 8 |
Early online date | 19 May 2016 |
DOIs | |
Publication status | Published - 1 Aug 2016 |
Keywords
- Total hip replacement
- acetabular cups
- press-fit fixation
- initial stability
- biomechanical study
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Dive into the research topics of 'The effect of dynamic hip motion on the micromotion of press-fit acetabular cups in six degrees of freedom'. Together they form a unique fingerprint.Profiles
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Patrick Keogh
- Department of Mechanical Engineering - Head of Department
- Centre for Digital, Manufacturing & Design (dMaDe)
Person: Research & Teaching, Core staff
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Tony Miles
- Department of Mechanical Engineering - Professor Emeritus
Person: Honorary / Visiting Staff