I have recently had a revision of my BHR to a THR because of high ion levels, even though I had no pain, nor any evidence of pseudotumor. My only symptom was a slipping or clunking sensation deep in the joint. My experience suggests that one can be at risk for metallosis long before symptoms appear, and that patients who have a serious clunking problem that persists would probably be wise to have their metal levels checked.
My resurfacing was done by a highly experienced surgeon 18 months ago. I had a smooth recovery and was delighted to be pain free within a few weeks. The hip clunked with certain movements, but I was reassured by both the surgeon, and much of the discussion on this website, that this would be a temporary problem that would resolve itself. It didn’t, however. In fact, the clunking became more and more frequent – eventually reaching a level of many hundreds of clunks a day.
At my one year follow-up appointment everything appeared to be fine – x rays looked good, (acetabular cup at a near perfect 40 degrees), excellent range of motion, pain free, etc. However when I raised the issue of the clunking yet again, this time the surgeon was concerned and arranged for my metal ion levels to be checked. The numbers came back sky high: 1616.9 for cobalt and 840 for chromium. When the ion levels were checked again six weeks later, they had risen significantly to 2265.8 and 1219 respectively.
Given these exceptionally high levels, and the rapid rate of increase, I was immediately scheduled for surgery to remove the BHR and replace it with a THR. The surgery went well. There was a great deal of metallosis but no sign of pseudotumor and no bone damage, confirming the value of the early intervention. The surgeon was able to remove the acetabular component with minimal bone loss allowing for what we trust will be a successful replacement implant. So far (8 weeks post surgery) I am very happy with the performance of the new THR, which is pain free and clunk free. I have been tested for metal ions again recently and am awaiting the results. Hopefully they will confirm that the levels are dropping.