Hi krishnendu, welcome to the site!
Sorry that you have to worry about this. I assume that you have the ASR and that prompted your surgeon to do the metal ion test and the MRI.
There are several limits used as rules of thumb for metal ion testing, what is the upper limit. The most stringent is from a new study that came up in 2012, which set some strict limits. This is from researchers who also recognize that other surgical groups accept higher limits for the two metals tested for.
My surgeon is happy with anything under 7 for both, but to use the most stringent study to date, the latest accepted upper limits for both are:
(from this source: http://www.hipresurfacingnews.com/categories/20-Metal-Ion-Issues
Chromium - 4.6 for one hip, 7.4 for bilats
Cobalt - 4.0 for one hip, 5.0 for both.
From the numbers from your test, it seems like you're slightly above the curve (5.64) on Chromium for this study, well below on Cobalt (1.24), based on one hip results (for two hips you're fine).
Your MRI results seem stellar, so there is no symptom to beware of present. No soft tissue mass, so on.
Remember, the numbers I quoted are the strictest out there, other surgical bodies recognize higher. The Medicines and Healthcare Products Regulatory Agency in the UK uses 7 ug/l as its upper end, which puts you below their threshold for concern.
One thing to consider is that the ASR, while it failed significantly more than other HR components, also succeeded in a large number of patients. The average percent revisions for that device over the years noted in the Australian registry study:
- 0-3 months - 1.66
- 3Mth - 1.5Yr - 1.95
- 1.5Yr - 4.5Yr - 4.21
- 4.5Yr - 5Yr - 9.56
- 5Yr+ - 6.40
Cumulative, the revision rate is 23.4% at seven years. So the success rate for this device, which was considered defective and pulled out of circulation is still 76.6% at seven years.
If you have the ASR, have no symptoms and the metal tests are reasonable, it seems fine, but I am not a medical person
, and you should discuss these concerns with your surgeon, who will be much more able to tell you what he or she considers safe or worth observing.
Good luck and welcome again!