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There were 7 cases of explant within the first
3 years after the operation, 10 between 4 and 6 years, 8
between 7 and 9 years and 5 after 10 years or more.
All explants were studied
under the microscope, first of all over the whole convexity,
for friction signs, then in the unpolished-looking
tightening area.
  Microscope study
The convexity shows the marks left by the
machining tool.
 
Enlarged machining marks
(LNE)
The tightening area shows grooves in the
impaction axis, small enlargement in our labs, strong
enlargement at the Laboratoire National d'Essai,
LNE.
These grooves were made when the cup was
impacted, with the rough internal surface allows for
rotation stabilisation.
Tightening grooves : enlarged
25 times
Tightening grooves found by
the LNE : enlarged 300 times
The slot is clearly visible
after 11 years and 9 months
Conclusion
Nowhere on any explant did we observe that the
marks disappears, which rules out friction on the insert
convexity.
Observing the area opposite the slot shows that without
clamping at that place, the machining marks are still there,
even after 10 years. The clear outline in strong enlargement
images points to the absence of micromobility.
No
micromobility
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