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Insert
Thickness
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Back
in 1986 Bartel3
recommended 8 to 10 mm thick polyethylene in order to
prevent the polyethylene from deteriorating rapidly and to
reduce creeping.
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Collier8
conducted an important survey, analysing 111 deteriorated
modular acetabular cups removed in the United States, within
a very short period - 8 months to 66 months - after the
operation. The main cause of the deterioration was the
excessive thinness of the polyethylene due to a 10 to 15 mm
thick metal cup , and 32 mm heads.
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Rapid deterioration of an
excessively thin insert
According to Tradonski23
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Great
polyethylene thickness is essential. Polyethylene creeping
occurs in the thickness of the material if the material is
thick enough, and if it is too thin, the creeping affects
the external convex surface of the cup, leading to conflicts
with, and possibly holes in the metal back.
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Creeping in thick
polyethylene
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Creeping affecting convexity
in too thin polyethylene.
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Esop®'
cup is only 2.5 mm thick, allowing for optimum polyethylene
thickness. We recommend using small size heads, allowing for
polyethylene thickness equal to or higher than 10 mm.
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More
information
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Our 10 year + without osteolysis
confirm the concept
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More
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Welcome
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various Esop -
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stability -
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stability -
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analysis -
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inventor -
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