The issue of cup slippage in the immediate postop
period is a controversial one.
While bone ingrowth takes around 6 wks. – the
hydroxy apatite to bone chemical reaction can occur
much more quickly.
If we surgeons feel that the
cup is not perfectly tight ( press fit) during the
surgery then we restrict activities for a 6 -8 wk
period .This is done in the hope that no
precipitating event would occur that would tilt the
balance adversely till some stability occurs as we
have not achieved primarily stability during
surgery. I must say that most of these times we are
able to ‘escape’ component loosening.
I have done this a few times in my very early cases
, many years ago. Of course these days we get such
spectacular fixation of the cup primarily that many
of my patients are visiting the gym in 5-6 days