Of fourteen isolated avulsion fracutres of the posterior tibial
attachment of the posterior cruciate ligament, one was undisplaced and five
were minimally displaced. These six were treated conservatively, but four
of the five displaced avulsion fractures progressed to non-union and
significant functional disability. Eight displaced avulsion injuries were
treated by open reduction. In four knees the fragment was sutured back to
its origin on the posterior superior aspect of the tibia, and three of the
these united. In two knees the fragment was large enough to fix with a
screw and union ensued. There was excellent functional capacity in five of
the six that united. The other two displaced fractures, treated three and
seven months after injury, had open reduction and the fragments were
sutured to the tibia in an advanced position. Union was obtained in both
with good functional capacity.