Abstract
The clinical importance of material loss at the head-stem junction is unknown. Comparison of retrievals with different stem types can provide the opportunity to understand the importance of the taper junction. This was a case-control study involving 20 retrieved 36 mm metal-on-metal Pinnacle (DePuy) hips that were paired with either a Corail (n = 10) or S-ROM (n = 10) stem. The median head taper material loss rate for the Corail group was 0.238 (0.0002-2.178) mm(3)/year and was significantly greater than the S-ROM group (p = 0.042), which had a median material loss rate of 0.132 (0.015-0.518) mm(3)/year. The only significant difference between the groups was the stem taper roughness and length: this was rougher and shorter for the Corails. Long and smooth stem taper designs are preferred when used in conjunction with metal heads.
Original language | English |
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Pages (from-to) | 91-97 |
Number of pages | 7 |
Journal | Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine |
Volume | 229 |
Issue number | 1 |
DOIs | |
Publication status | Published - Jan 2015 |
Keywords
- Adult
- Aged
- Equipment Failure Analysis
- Female
- Friction
- Hip Prosthesis
- Humans
- Metal-on-Metal Joint Prostheses
- Metals
- Middle Aged
- Particle Size
- Prosthesis Design
- Surface Properties
- Comparative Study
- Evaluation Studies
- Research Support, Non-U.S. Gov't