The primary purpose of the current study is to investigate if the CONSERVE® A-Class Total Hip with BFH technology will lead to lower blood ion levels in patients, as compared to patients in a recent study who received the CONSERVE® Plus Total Resurfacing Hip System, another metal-on-metal device. We are also comparing functional and radiographic (x-rays) outcomes between patients who receive the CONSERVE® A-Class Total Hip compared to those who have received the CONSERVE® Plus Total Resurfacing Hip System.