Southampton scanner maps problem hip replacements
20 February 2013 Last updated at 11:54 GMT
A new way of testing hip joints that have failed is being pioneered in Southampton.
About 5,000 patients in the area have metal joints - and some have had to be replaced because they have caused pain and problems.
Now those joints are being examined using a new scanning machine to find out what went wrong.
BBC South's health correspondent David Fenton reports.