• The primary outcome of the study is to record and measure bone density and growth using Xray and DEXA scans between the two groups. [ Time Frame: Pre-operatively, 6 months, 1 year, 2 years. ] [ Designated as safety issue: No ]
  

• Secondary outcomes are functional assessment using Harris Hip Score and Clinical Assessment using Oxford Hip Score and Womac Score. [ Time Frame: Pre-operatively, 6 months, 1 year, 2 years. ] [ Designated as safety issue: No ]
  

The patients will be identified by the orthopaedic surgeon in the orthopaedic clinic and deemed suitable for the study if all inclusion and exclusion criteria are met. 210 patients will be recruited to the study and each patient will be randomised into either of the groups allowing 105 patients into each group. Patients will be followed up at 6 months, 1 year and 2 years after the surgery. All patients will have radiographic assessments at these follow-up intervals, as well as Harris Hip, Oxford Hip and Womac scores. This will allow comparison of the two groups.

The BoneMaster coating has been extensively tested in cell and animal studies and has been evaluated in one previous clinical study and showed favorable results. Further investigation is required to ensure the new coating may enhance bony growth allowing better fixation of the hips in the early period after the operation and also over a longer period of time. The growth needs to be measured using a more sensitive scan than radiographic assessment alone, called DEXA which was also used in the previous study.