|
|
|
Insert Thickness
|
|
Back in 1986 Bartel3 recommended 8 to 10 mm thick polyethylene in
order to prevent the polyethylene from deteriorating rapidly
and to reduce creeping.
|
|
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.
|
Rapid deterioration
of an excessively thin insert
According to Tradonski23
|
|
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.
|
Creeping in thick
polyethylene
|
Creeping affecting
convexity in too thin polyethylene.
|
|
Atlas®' 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.
|
More
information
|
|
|
|
|
Our 10 year + without
osteolysis confirm the concept
|
More
information
|
|
Welcome - The
various Atlas -
Primary
stability -
Insert
stability -
Insert
thickness -
Secondary
stability -
Alumina/Alumina - Explant
analysis
Low-friction - Surgical
procedure -
Clinical
data - Quality
requirement -
The
inventor -
Contact - International
distribution
|