8. Subjects requiring a simultaneous bilateral hip at the time of consent will be excluded; there can be only one Actis™ study hip. This also means that even if another hip system is used for the contralateral hip during simultaneous THAs, the Subject will be excluded. As noted above, Subjects who have an existing contralateral total hip replacement greater than 6 months postoperatively at the time of consent may be entered into this study if they qualify based upon the eligibility criteria and the approved labeling requirements.