July 24, 2013
My take on this is that it is not an unexpected response to the
generally higher than desired failure rate of MOM total hips. None of the
doctors I know will primarily recommend a MOM THR anymore. A few short years ago
these were very popular, mostly due to the fact that dislocations continue to
plague THR, representing the single biggest reason for revision THR in the USA.
Since dislocation goes down with bigger heads, and the biggest heads of all are
with MOM hips, your average hip surgeon went for the biggest heads to avoid
dislocation and used a MOM THR.
Unfortunately, as happens in technology development, there was
an unanticipated problem. The junction between the head and stem of a THR (a
“Morse taper”), is a cold weld designed back in the days of 28 and …