Ninety-eight percent of the hip replacements done in this country are successful, so let’s start with that.  But when (or if) they fail, they are more likely to fail in women—almost 30-percent more likely within in the first three years.  This is all new research that just shows they need to do a little more research on what women need when it comes to hip replacements.
Doctors think this failure is in part due to women having smaller bones and therefore needing smaller implants so the ball that is replaced in the socket is smaller.   While that could be the answer, I would assume women had smaller balls entering the socket anyway.
Biomechanist and blogger (although she seems like a lot more than just these two descriptions) Katy Bowman, thinks the cause might be mechanical, which might even explain the cause of needing to get the hip replaced in the first place.   It might be, partly, as simple as women standing with their feet too close together.  In general, women have wider pelvises than men, stand with their feet together rather than hip distance apart which equates to a lot more pressure and torque on your pelvis where the femur (thigh bone) and the pelvis meet.
So, women, what have you got to lose? Spread those legs a little.  Don’t take them as wide as shoulder width, but check in when you stand up in a line or at the gas station.  Make sure your feet are neither touching nor wider than your entire pelvis.  Where do your feet land?  Lately, I’ve been noticing that I not only bring my feet together, I cross them when I stand.  Yikes.  So I’ll be working on this with you.
Note: I snapped this photo at the Gap the other day.  Where are their feet?  Too close together, that’s where.