|Author||Kocagoz et al.|
In this study, researchers from Drexel University quantified the volumetric material loss from the head bore and stem cone tapers of a matched cohort of ceramic and metal heads. A quantitative method was developed to estimate volumetric material loss from the head and stem taper in previously matched retrieval cohorts of 50 ceramic and 50 CoCr head-stem pairs. An order of magnitude reduction in volumetric material loss was found when a ceramic head was used instead of a CoCr head. The researchers found that ceramic femoral heads were an effective means by which to reduce metal release caused by taper fretting and corrosion at the head bore-stem cone modular interface in THAs.
|Author||Fredette et al.|
|Field||BioMed Res Int|
Metal transfer has been observed on retrieved THA femoral heads for both CoCr and ceramic bearing materials. Researchers investigated the extent of metal transfer on the bearing surface of CoCr and ceramic femoral heads and identified prevalent morphologies. Three bearing couple cohorts were studied: M-PE (n=50), C-PE (n=35), and C-C (n=15). Surface area coverage and curved median surface area were similar among the three cohorts. The most prevalent metal transfer patterns observed were random stripes, longitudinal stripes, and random patches. Metal transfer arc length was shorter in the M-PE cohort.
|Author||Kurtz et al.|
Researchers from Drexel University have investigated whether ceramic femoral heads reduce taper fretting and corrosion damage when compared with cobalt chrome (CoCr) alloy femoral heads. A matched cohort design was used in which 50 ceramic head-stem pairs were matched with 50 CoCr head-stem pairs. The results suggest that using a ceramic femoral head mitigates CoCr fretting and corrosion from the modular head-neck taper interface.
|Author||Huet et al.|
This review paper summarizes the published literature regarding alumina ceramic femoral heads and tries to identify areas where uncertainties remain. We will discuss the following topics: (1) the fracture mechanics of ceramic materials; (2) design-related stresses acting on the femoral head, especially at the interface between the stem trunnion and the head; (3) gradual loss of strength in service by fatigue or slow crack growth and simulation using a proof test; and (4) information that can be gathered from examination of fractured explants.
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