Siljander MP, Trousdale RT, Perry KI, et al. - This research was attempted to present implant survivorship, clinical outcomes, radiographic results, and complications in patients with osteopetrosis undergoing primary total hip arthroplasty (THA). Between 1970 and 2017, researchers distinguished 7 patients (9 hips) with osteopetrosis who had undergone primary THA utilizing the total joint registry. Eight years was the mean follow-up. In patients with osteopetrosis, primary THA is correlated with good 10-year implant survivorship (89%), but a very high reoperation (58%) and periprosthetic femoral fracture rate (44%). Femoral fractures seem correlated with smaller intramedullary diameters.