Institution: The University Oxford / Salisbury District Hospital
Investigators: Dr David Simpson, Dr Richie Gill, Professor David Murray, Mr Graham Rushforth
Stream: Clinical Fellowship
Topic: Lower Limbs/Design (Hip)
Status: Live
The Furlong HAC stem has excellent long-term survival rates, and has been reported to have a 99% survivorship at 13 – 15 years. A new uncemented stem based on the Furlong HAC has recently been introduced to overcome certain limitations of the established stem. The new device has no collar and is shorter, and has a slightly different proximal taper but the fixation method remains the same, a full length HA coating. It is not known how well this device will perform in the long-term and the hypothesis is that it will function as well as the original Furlong HAC.
RSA is an ideal tool for the early assessment of new implants since it can accurately measure the migration of the prosthesis relative to its host bone. This study aims to measure the early migration of the active uncemented stem, comparing it to its predecessor with a randomised control trial.
It is too early on in the study to interpret the current results further. One year data is useful with the full cohort, but the results only become meaningful at two years. It must be born in mind that normally implants migrate the largest distance during the first year and this migration will plateau for a stable implant over the course of the second year.
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