Dislocation Rate in Large Diameter Metal-on-Metal Hip Replacement – Hena Ziaee 2007
Hena Ziaee discusses the dislocation rates in large diameter metal on metal hip replacements, focussing on study results and the factors that cause dislocation.
Biomedical Scientist Hena Ziaee BSc (Hons) talks about the large diameter metal on metal hip replacement arthroplasty and the rates and causes of dislocation of the implant.
Dislocation rates in conventional hip replacements can vary from three to fifteen per cent. This can depend on patient factors such as age, muscle tone and previous hip surgery. Factors regarding the surgery can also affect dislocation rate, such as the approach, cup positioning and surgeon experience.
In Derek McMinn's series of three thousand Birmingham Hip Resurfacings (BHRs), the dislocation rate is 0.2 per cent, with the mean age of patients being fifty three years old.
The large headed metal-on-metal Total Hip Replacement (THR) was originally developed to treat patients who had sustained a femoral neck fracture or femoral head collapse following hip resurfacing surgery.
In patients with a well fixed cup, it was possible to revise the femoral head with a matching modular head component fixed onto a compatible stem. The success of this device led to it being considered for use as a primary hip replacement procedure.
