Women most at risk from poorly performing metal-on-metal hip replacement devices, National Joint Registry Annual Report finds

The UK National Joint Registry’s annual report has been published. According to the report; “Performance for the controversial metal-on-metal (MoM) hip replacement devices continues to create cause for concern, particularly in women.”

“Revision rates (how likely it is that a patient will need an operation to remove and usually replace a prosthesis) for the devices are by far the highest for the two main categories of MoM hip devices. These two are divided into ‘Resurfacing’ devices and those known simply as ‘Metal-on-Metal’.

For ‘Resurfacing’, the report reveals latest revision rates of 11.81% and for ‘Metal-on-Metal’ as high as 13.61%. Against these, rates for the non-MoM hip prosthesis types ranged from 3.31% to 4.94%. Devices have been monitored on the NJR since 2003. The latest figures reflect the performance on the registry data at one, three and five year intervals (to December 2010).”

“Further, the year-on-year increase in revision rates for the MoM categories was dramatic. While all of the non-MoM prostheses types reported a less than 1% increase in revision rates, ‘Resurfacing’ devices increased by 1.93% and the ‘Metal-on-Metal’ group climbed 4.11%.”

“For women, the picture is even starker. Gender-based statistics are analysed at one, three and five years after devices are first implanted. At five years, revision rates for a 60-69-year old female with a resurfacing device are 12.01% and it is 7.34% for the general MoM devices. Meanwhile, the same statistics for men came in at 7.06% and 5.48%. Non-metal-on-metal five-year revision rates for females aged 60-69 range from 2.02% to 3.19%. (Note: The overall average age for hip replacement patients is now 67).
In 2010, figures from the NJR led to the worldwide recall of the DePuy ASR metal-on-metal device, which had proved particularly poorly performing.”

“The NJR is the largest database of its kind and includes 1.1million records covering hip, knee and ankle joint procedures in England and Wales, carried out since 2003 (1 April 2010 for ankles). This year saw the largest ever number of single-year submissions (179,450) and the highest-ever patient consent rates, with 88.6% of patients consented to having their information recorded.”

The full report can be found here.

Source: National Joint Registry

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