Psoas tendinitis is an important reason for groin
pain in resurfacing surgery.
This is peculiar to resurfacing as the cup for
resurfacing is a very large profile ie half a sphere.
Nearly all THR cups are only portions ( arc) of a
Hence if the antero-posterior orientation i.e., version
of the cup is marginally off the ideal , it would not be
a problem with THR. However in resurfacing, due to the
very large profile , if the version is less than ideal
the ant edge of the cup will protrude out of the bony
front wall of the acetabulum . The psoas tendon will rub
on this and patients will typically complain of pain
when attempting to lift their leg in a standing position
For this reason we now take extra care to get the
version right and most resurfacing surgeons leave a 3mm
rim of osteophytes over the ant edge as a safety
precaution to avoid this problem.
with best regards