Hydrothermal Stability of Ceramic Femoral Heads

Corfield, Vicki; Khan, Irfan; Scott, Robert G.

doi:10.1007/978-3-7985-1783-7_7

Cited by 6 publications

(8 citation statements)

References 6 publications

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“…This same value was again reported in a separate paper published in 2012 [41]. Values of ~80 kN were also reported in a study by Corfield et al, with retention of this strength after 50 h of hydrothermal ageing [42]. In the most recent publication by Garino, the burst strength of BIOLOX ® delta was reported to be 101 ± 7 kN.…”

Section: Discussionsupporting

confidence: 81%

“…Moreover, previous literature reported that the burst strength of ZTA was unaffected by hydrothermal ageing up to 20 h [48] or even 50 h [42]. The values of ultimate load measured at 150 and 165 h of loading and hydrothermal ageing treatment (Figure 2) suggest that small losses were already present even at 20 and 50 h, but the amount of loss could not be measured precisely due to the large scatter within the data points.…”

Section: Discussionmentioning

confidence: 84%

“…Two materials are typically used-A titanium alloy (TI6Al4V) and a cobalt-chromium alloy (CoCr). Literature also shows some lower burst-test results (around 70 kN) for components subjected to hydrothermal ageing [42]. Perhaps these parts were tested using CoCr trunnions.…”

Section: Discussionmentioning

confidence: 99%

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Burst Strength of BIOLOX®delta Femoral Heads and Its Dependence on Low-Temperature Environmental Degradation

et al. 2020

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Zirconia-toughened alumina (ZTA) currently represents the bioceramic gold standard for load-bearing components in artificial hip joints. ZTA is long known for its high flexural strength and fracture toughness, both properties arising from a microscopic crack-tip shielding mechanism due to the stress-induced tetragonal-to-monoclinic (t→m) polymorphic transformation of zirconia. However, there have been concerns over the years regarding the long-term structural performance of ZTA since the t→m transformation also spontaneously occurs at the material’s surface under low-temperature environmental conditions with a concomitant degradation of mechanical properties. Spontaneous surface degradation has been extensively studied in vitro, but predictive algorithms have underestimated the extent of in vivo degradation observed in retrievals. The present research focused on burst-strength assessments of Ø28 mm ZTA femoral before and after long-term in vitro hydrothermal ageing according to ISO 7206-10. An average burst strength of 52 kN was measured for pristine femoral heads. This value was ~36% lower than results obtained under the same standard conditions by other authors. A further loss of burst strength (~13% in ultimate load) was observed after hydrothermal ageing, with increased surface monoclinic content ranging from ~6% to >50%. Nevertheless, the repetitively stressed and hydrothermally treated ZTA heads exceeded the minimum burst strength stipulated by the US Food and Drug Administration (FDA) despite severe test conditions. Lastly, Raman spectroscopic assessments of phase transformation and residual stresses on the fracture surface of the femoral heads were used to clarify burst-strength fluctuations and the effect of hydrothermal ageing on the material’s overall strength degradation.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 84%

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Burst Strength of BIOLOX®delta Femoral Heads and Its Dependence on Low-Temperature Environmental Degradation

et al. 2020

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“…25%) and strontium platelets plus chrome oxide are added. the percentage of zirconia still contains a metastable tetragonal phase, but it was shown that surface roughening due to ageing did not occur (Corfield et al, 2007). the stiffness and hardness of Biolox ® delta ceramic is in the range of alumina, while its flexural strength is almost twice as high.…”

Section: Composite Ceramicmentioning

confidence: 96%

“…3-4%, hence ageing of zirconia may result in surface roughening. Zirconia has a lower hardness, stiffness and grain size and a higher density and flexural strength than alumina, resulting in a lower risk of breakage in orthopaedic applications (Blaise et al, 2001;Corfield et al, 2007;clarke and Willmann, 1994;cales and stefani, 1995).…”

Section: Zirconiamentioning

confidence: 96%