I received an article on Trunion ware from someone who sent in an unpublished paper. Here is a brief summary of what I got from the paper which I suppose will be published at some point.
As a background to this post:
Last week I was speaking with the hospital Path department who are responding to requests to have the explants sent for examination. When I asked what parts she had of my explant, I expected her to say:
- Taper/Stem/trunion (I think these are all the same.)
Results from the Tunion study:
Paper can be found here (note/no author and no publication so I am not sure of the origin of this paper. One of the readers sent it to me.) http://www.jbjs.org.uk/media/55176/27749-resub.pdf
have had a chance to read it now. Seems consistent with the comments on other papers re the wear debris generated from the trunion/taper/stem.
the key things I got out of this paper:
after reviewing 111 of the component hips, the tapers/stem/trunion from 3 manufactures (Dupuy, Smith and Nephew and Zimmer) findings follow :
-showed that 102 of the 111 stems showed signs of corrosion.
-corrosion did not influence the levels of Co or Cr in the blood (interesting)
-seems that the study claims this was the first study to quantify the severity of the MOM THR devices
-claims also that this was the largest analysis of retrieved ASR MOM hips performed to date.
-their hypothesis was that the ASSR device would demonstrate more corrosion than the other two hips given its recall I guess. This was not the case however according to this unpublished paper.
Most important point was that the paper overall supported the view that the head-trunnion junction is a significant source of material loss and thus may be a contributor towards the accumulation of the metal ions in the blood.
All very interesting.