RESULTS	Twenty percent of the patients in the unipolar HA group displayed acetabular erosion at the 12-month follow-up compared to 5 % in the bipolar HA group ( p = 0.03 ) , and there were trends towards worse hip function and HRQoL among patients with acetabular erosion compared to those without : HHS scores 70.4 and 79.3 , respectively ( p = 0.09 ) , and EQ-5D ( index ) scores 0.48 and 0.63 , respectively ( p = 0.13 ) .\