... withcement. We therefore recommend that the presence of cysts within the femoral head, as long as they compriseless tha n 1/3 of the remaining prepared femoral head, beeliminated as a risk factor for ... contributionsTPG designed this study, collected the data, and drafted the manuscript. FLdesigned this study, analyzed the data, performed statistical analyses anddrafted the manuscript. All of the authors ... con-sidered poor candidates for HRA. If the alternative risks of amputating the femoral head and neck to perform astemmed THA are much lower in this group, the theoreti-cal advantage of bone preservation...