The students' effort had a head diameter of 88.9 cm (35 in) and a shaft width of 35.24 cm (13.87 in).

CNN: February 5, 2013 -- Updated 1840 GMT (0240 HKT)

The Medicines and Healthcare products Regulatory Agency (MHRA) has issued new advice saying patients with these large head diameter metal-on-metal hips will need monitoring for the life-time of the implant.

BBC: Annual checks for patients with all-metal hips

But concern has been emerging for some time about certain types of metal-on-metal hips, in particular those where the ball head has a diameter of 36mm or more.

BBC: Annual checks for patients with all-metal hips