Phase Transformation and Residual Stresses in Retrieved Zirconia Ball Implant

Clarke, Ian C.; Pezzotti, Giuseppe; Sakakura, S.; Sugano, N.

doi:10.4028/www.scientific.net/kem.240-242.777

Cited by 7 publications

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“…This appears to be the first examination of Y‐TZP zirconia bearings for phase transformation in a simulator wear model 12, 23, 44, 45. At 10 million cycles duration, microscopic examination by a highly spatially‐resolved, confocal Raman probe did not detect any transformation on the surfaces of the zirconia condyles.…”

Section: Discussionmentioning

confidence: 80%

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Y‐TZP zirconia run against highly crosslinked UHMWPE tibial inserts: Knee simulator wear and phase‐transformation studies

et al. 2007

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Section: Discussionmentioning

confidence: 80%

“…The confocal Raman Spectrometer was used to provide precise mapping of the transformation process. The zirconia femoral condyles were entirely scanned with the confocal microprobe and the Raman spectra belonging to their surface recorded and analyzed 22, 44–46…”

Section: Methodsmentioning

confidence: 99%

Y‐TZP zirconia run against highly crosslinked UHMWPE tibial inserts: Knee simulator wear and phase‐transformation studies

et al. 2007

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“…The addition of such realistic features to conventional wear simulation tests certainly represents a fundamental step in properly assessing the reliability of the hip joint on the macroscopic scale; however, improvements in microstructural design of hip‐joint materials also call for a better understanding of the microscopic mechanisms behind wear degradation of the joint surface. From this latter point of view, the major concerns are the physical modifications of the ceramic joint surface arising from the combined effects of biological environment and wear, and the consequent presence of mechanical (residual) stresses 5,6 . These requirements are particularly urgent in view of recent developments in artificial hip‐joint design, including ceramic femoral heads coupled with ceramic acetabular cups.…”

Section: Introductionmentioning

confidence: 99%

“…From this latter point of view, the major concerns are the physical modifications of the ceramic joint surface arising from the combined effects of biological environment and wear, and the consequent presence of mechanical (residual) stresses. 5,6 These requirements are particularly urgent in view of recent developments in artificial hipjoint design, including ceramic femoral heads coupled with ceramic acetabular cups. In this context, the development of an advanced spectroscopic analytical tool, capable of quantitatively analyzing the joint surface not only in its entireness but also with high spatial resolution, is mandatory.…”

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confidence: 99%

Raman Spectroscopic Analysis of Advanced Ceramic Composite for Hip Prosthesis

Pezzotti

Yamada

Sakakura

et al. 2008

Journal of the American Ceramic Society

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A ceramic hip‐joint femoral head, made of a zirconia‐toughened alumina‐matrix material with the addition of small amounts of mixed oxides, has been evaluated with respect to environmental surface degradation in a moist environment. Microscopic insight into environmental surface degradation could be obtained according to Raman and fluorescence microprobe spectroscopies. By adopting an optimized confocal configuration for the optical probe, spectroscopic assessments could be performed in very shallow volumes, thus minimizing the effect on the spectra of sub‐surface portions of the material. Two main phenomena have been envisaged: (i) transformation of zirconia dispersoids from tetragonal to monoclinic polymorph, induced by aging periods at 121°C (0.1 MPa) in a vapor environment (in addition to a fraction of a monoclinic polymorph ≅20 vol% present in the as‐received femoral head); (ii) evolution of the (equilibrium) residual stress field stored within the joint surface from a tensile field in the as‐received material to a slightly compressive stress field after several hours of aging in a moist atmosphere. Exposures in vapor >50 h brought the joint surface into an increasingly tensile stress state. This residual stress field on the material surface may hinder the long‐term wear resistance of the load‐bearing femoral head, especially in the presence of microscopic impingements by microseparation contact and third‐body wear.

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“…Surface deterioration of retrieved ceramic balls has recently been studied using high‐resolution fluorescence spectroscopic techniques 14–16. Fluorescence spectroscopy provides an improved understanding of the microscopic phenomena behind ceramic wear because it can reveal the residual stress fields stored on the bearing surface of the alumina joint 14.…”

Section: Introductionmentioning

confidence: 99%

Surface micro‐analyses of long‐term worn retrieved “Osteal™” alumina ceramic total hip replacement

et al. 2007

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We analyzed wear pattern of long-term retrieved alumina-alumina hip prostheses from Osteal, which were implanted for 15-19 years. A comparison was carried out with our previous study of 17-year Biolox alumina-on-alumina hip prostheses, (Shishido et al., J Biomed Mater Res B 2003;67:638-647) and all-alumina total hip replacement run under microseparation simulator tests. Of particular interest was the occurrence of stripe wear in these first generation alumina ceramic bearings. Two balls of Osteal revealed only one stripe wear as did the respective liners on their rim areas. In these latter balls, the stripes were shallower than those previously observed in Biolox implants. A microscopic analysis of the bearing surface was carried out using scanning electron microscopy and fluorescence microprobe spectroscopy. On average, the Osteal retrievals had one grade lower wear than Biolox retrievals. Fluorescence microprobe maps showed that Biolox ball surfaces had higher compressive stress than the Osteal likely due to severe impingement and microseparation promoted by the bulky implant design.

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Phase Transformation and Residual Stresses in Retrieved Zirconia Ball Implant

Cited by 7 publications

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Y‐TZP zirconia run against highly crosslinked UHMWPE tibial inserts: Knee simulator wear and phase‐transformation studies

Y‐TZP zirconia run against highly crosslinked UHMWPE tibial inserts: Knee simulator wear and phase‐transformation studies

Raman Spectroscopic Analysis of Advanced Ceramic Composite for Hip Prosthesis

Surface micro‐analyses of long‐term worn retrieved “Osteal™” alumina ceramic total hip replacement

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