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The influence of surface roughness on stem-cement gaps.
A Race1, M A Miller, D C Ayers
1Institute for Human Performance, Musculoskeletal Science Research Centre, SUNY Upstate Medical University, Syracuse, New York 13210, USA.
The Journal of Bone and Joint Surgery. British Volume
|December 5, 2002
Summary
Grit-blasting hip implants created larger gaps at the stem-cement interface compared to standard satin finishes. This suggests increased surface roughness may not improve clinical cement bonding in hip arthroplasty.
Area of Science:
- Biomaterials science
- Orthopedic surgery
- Medical device engineering
Background:
- The stem-cement interface is critical for hip arthroplasty success.
- Surface modifications aim to enhance implant fixation.
- Grit-blasting is a surface treatment used to increase roughness.
Purpose of the Study:
- To compare interface morphology between standard satin-finished and grit-blasted Charnley hip stems.
- To evaluate the effect of proximal grit-blasting on stem-cement gap formation.
- To assess the clinical relevance of surface roughness on cement bonding.
Main Methods:
- Comparison of standard (Ra = 0.75 microm) and grit-blasted (Ra = 5.3 microm) Charnley stems.
- Cementation into cadaver femora using contemporary techniques.
- Transverse sectioning to determine percentage of stem perimeter with interface gaps.
Main Results:
- Grit-blasted regions showed substantial stem-cement gaps (mean 31.4 +/- 17.1%).
- This gap percentage was significantly higher than for satin-finished stems (mean 7.7 +/- 11.7%).
- P-value of 0.0054 indicates a statistically significant difference.
Conclusions:
- Increased surface roughness from grit-blasting did not reduce interface gaps in clinical conditions.
- The assumption that increased roughness improves bond strength may not hold for cemented hip arthroplasty.
- Further research is needed to optimize surface treatments for improved implant fixation.
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