Abstract
Despite being the most used ceramic biomaterial in hip joint prosthesis, Zirconia Toughened Alumina (ZTA) is liable to undergo several degradation mechanisms in vivo, which might drastically affect its structural performance over time. Our standing point in this investigation was that neither in vitro tests nor finite elements simulations are yet capable to fully reproduce the complexity of the in vivo conditions. Through accurate analyses of retrievals, we attempt to add more pieces to the puzzle of in vivo loading history and to obtain better insight into the ZTA degradation mechanisms. For doing so, we applied a previously established automated scanning protocol to investigate the coupling between a ZTA femoral head and its metal stem counterpart in a short-term (20 months) retrieved hip implant. Metal contamination on the ZTA surface was severe and polymorphic transformation widespread on the whole surface of the taper, though reaching different values depending on the specific zone of the taper. Clear signs of third body abrasive wear and fatigue crack initiation could be found by means of laser and electron microscopies, and X-ray spectroscopy. Highly resolved mapping by Raman micro-spectroscopy revealed very high monoclinic fractions and pronounced residual stress magnitudes despite the relatively short in-vivo lifetime.
| Original language | English |
|---|---|
| Pages (from-to) | 362-370 |
| Number of pages | 9 |
| Journal | Materials and Design |
| Volume | 157 |
| DOIs | |
| Publication status | Published - Nov 5 2018 |
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Keywords
- 3D-CAD
- Confocal Raman spectroscopy
- Metal contamination
- Phase transformation
- Zirconia-toughened alumina
ASJC Scopus subject areas
- Materials Science(all)
- Mechanics of Materials
- Mechanical Engineering
Cite this
Degradation phenomena occurring in the conical taper of a short-term retrieved ZTA femoral head: A case study. / Rondinella, A.; Marin, E.; Boschetto, F.; Zanocco, M.; Zhu, W.; Affatato, S.; Yamamoto, K.; Tateiwa, T.; Pezzotti, G.
In: Materials and Design, Vol. 157, 05.11.2018, p. 362-370.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Degradation phenomena occurring in the conical taper of a short-term retrieved ZTA femoral head: A case study
AU - Rondinella, A.
AU - Marin, E.
AU - Boschetto, F.
AU - Zanocco, M.
AU - Zhu, W.
AU - Affatato, S.
AU - Yamamoto, K.
AU - Tateiwa, T.
AU - Pezzotti, G.
PY - 2018/11/5
Y1 - 2018/11/5
N2 - Despite being the most used ceramic biomaterial in hip joint prosthesis, Zirconia Toughened Alumina (ZTA) is liable to undergo several degradation mechanisms in vivo, which might drastically affect its structural performance over time. Our standing point in this investigation was that neither in vitro tests nor finite elements simulations are yet capable to fully reproduce the complexity of the in vivo conditions. Through accurate analyses of retrievals, we attempt to add more pieces to the puzzle of in vivo loading history and to obtain better insight into the ZTA degradation mechanisms. For doing so, we applied a previously established automated scanning protocol to investigate the coupling between a ZTA femoral head and its metal stem counterpart in a short-term (20 months) retrieved hip implant. Metal contamination on the ZTA surface was severe and polymorphic transformation widespread on the whole surface of the taper, though reaching different values depending on the specific zone of the taper. Clear signs of third body abrasive wear and fatigue crack initiation could be found by means of laser and electron microscopies, and X-ray spectroscopy. Highly resolved mapping by Raman micro-spectroscopy revealed very high monoclinic fractions and pronounced residual stress magnitudes despite the relatively short in-vivo lifetime.
AB - Despite being the most used ceramic biomaterial in hip joint prosthesis, Zirconia Toughened Alumina (ZTA) is liable to undergo several degradation mechanisms in vivo, which might drastically affect its structural performance over time. Our standing point in this investigation was that neither in vitro tests nor finite elements simulations are yet capable to fully reproduce the complexity of the in vivo conditions. Through accurate analyses of retrievals, we attempt to add more pieces to the puzzle of in vivo loading history and to obtain better insight into the ZTA degradation mechanisms. For doing so, we applied a previously established automated scanning protocol to investigate the coupling between a ZTA femoral head and its metal stem counterpart in a short-term (20 months) retrieved hip implant. Metal contamination on the ZTA surface was severe and polymorphic transformation widespread on the whole surface of the taper, though reaching different values depending on the specific zone of the taper. Clear signs of third body abrasive wear and fatigue crack initiation could be found by means of laser and electron microscopies, and X-ray spectroscopy. Highly resolved mapping by Raman micro-spectroscopy revealed very high monoclinic fractions and pronounced residual stress magnitudes despite the relatively short in-vivo lifetime.
KW - 3D-CAD
KW - Confocal Raman spectroscopy
KW - Metal contamination
KW - Phase transformation
KW - Zirconia-toughened alumina
UR - http://www.scopus.com/inward/record.url?scp=85050890588&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85050890588&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2018.07.056
DO - 10.1016/j.matdes.2018.07.056
M3 - Article
AN - SCOPUS:85050890588
VL - 157
SP - 362
EP - 370
JO - Materials and Design
JF - Materials and Design
SN - 0264-1275
ER -