<qa>  What is the purpose of this study?The purpose of this study is to measure quantitatively the implant stability and implant related remodeling of the periprosthetic femoral bone of the new uncemented Echo Bi-Metric Full proximal Profile total hip arthroplasty THA stem, and compare it to the classical uncemented Bi-Metric Porous Primary THA stem by measuring migration of the stem assessed by model-based radiosteriometric analysis MB-RSA and measuring the periprosthetic adaptive bone remodeling assessed by dual-energy x-ray absorptiometry DXA. 