Inclusion criteria:  Primary total hip arthroplasty with diagnosis osteoarthritis. Placed January 1st 2007 and December 31th 2017 Patients who are 18 years and older  Exclusion criteria:  Hybrid fixation type (cemented stem and uncemented acetabular component) Reverse hybrid fixation type (uncemented stem and cemented acetabular component) Metal-on-metal bearing THA