 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. 