Ministry of HealthFriday 26 October 2012, 3:57PM
Media release from Ministry of Health
Surgeons in New Zealand have been asked some months ago to carry
out annual monitoring of all patients with metal-on-metal hip
implants following alerts some devices need to be replaced earlier
Medsafe have been advised the Durom Acetabular Cup, a device no
being used in New Zealand, is subject to an international hazard
The New Zealand Joint Registry reports the device, which was
discontinued by its manufacturer in June 2011, was used in 252 hip
implants in New Zealand.
Medsafe Group Manager Dr Stewart Jessamine says patient health is
not at risk - some people will simply require their implant to be
replaced earlier than expected.
"On average 90 per cent of people with a metal on metal hip implant
will have no problems with their implant at 10 years - a revision
rate of 1.00 per 100 component years.
"For the Durom device around 84 per cent of patients will not have
problems at 10 years. The slightly higher revision rate of 1.68 per
100 component years is the reason why the product is being
recalled. They do not pose any additional health risk to
"There is a greater awareness by manufacturers and regulators about
these devices, which is why we are seeing more of these alerts, say
"Regulators around the world, including Australia, have responded
in a similar way as Medsafe to the finding that some hip device
products have higher revision rates.
Medsafe will continue to work with manufacturers to ensure that
when an alert is issued, surgeons are fully informed and follow up
with their patients.
"If patients have any concerns or experience any discomfort or
pain, they should see
their GP or surgeon, as they normally would following any surgery
on a joint."
Metal-on-metal implants have been used in around 8% of the total
hip implants during the last decade and this rate is
Information for consumers about metal-on-metal implants has been
published on the Medsafe website at:
and made available to surgeons.
This component was first used in New Zealand in 2003, but
discontinued as a product by its manufacturer in June 2011.
Information about joint implants and revisions is collected by a
register run by the New Zealand Orthopaedic Association: http://www.nzoa.org.nz
This is the fifth action in New Zealand relating to the use of
metal-on-metal implant components, starting with De Puy ASR in 2010
(525 devices in New Zealand), and earlier in this year, the Mitch
TR (41), the Smith and Nephew R3 (139) and the Birmingham Hip
Modular Head (396).