Previous guidance issued in 2010 by the Medicines and Healthcare Products Regulatory Agency said patients with metal-on-metal implants only needed to be followed up for 5 years.
But the Regulatory Agency has now issued new guidance, saying that all patients with metal hip implants made from a metal cup with a 36mm ball or larger should have regular blood tests to see if metal ions have leaked into the blood.
The test should be repeated every three months. If the metal ion level has risen the patient should be given a MRI scan to check for muscle damage.
Dr Susanne Ludgate, Clinical Director of the MHRA, said: "We recognise there is a toxicity association with very high levels of cobalt and chromium levels.
"As far as we can find there have been nine cases of patients who have had such high levels (of metal ions in the blood) that it has manifested itself in symptoms like neurological problems and in all these cases this was reversed when the hip was taken out."