When the bone is weak/osteoporotic there is a general but undocumented recommendation of cemented over uncemented THA fixation. It has been shown that uncemented hip stems migrate more than cemented components in osteopenic and osteoporotic bone wherefore cemented stem fixation is recommended. However, Danish hip surgeons favour uncemented fixation even in the fragile and osteoporotic elderly because it reduces the surgical time, minimizes the risk of intraoperative cement disease/fat embolism and dead, and makes revision surgery in case of infection or peri-prosthetic fracture easier to re-operate. In 2012, 7364 acetabular cups were inserted uncemented versus 1015 uncemented - for all indications for THA in Denmark. Reoperation of the same hips within 2 years after primary THA due to new femoral neck fracture or complications following treatment of proximal femoral fracture was 4.7 %. There is clinical conviction that cemented cups are easier to place in the correct inclination and anteversion position. However, due to the posterior-lateral overhang of dual mobility cups the postero-lateral edge-cementation is likely to be insufficient leading to micromotion and aseptic loosening. In the clinical experience this is a lesser risk with cementless cups. Compared to other Nordic countries, Denmark has the lowest incidence of aseptic cup loosening of 34.8% and respectively 47.3% and 50.4% for Norway and Sweden. The reason for revision due to dislocation is 33.5% in Denmark compared to Norway and Sweden, respectively 23.8% and 23.4% and may be related to an overall difference in surgical approach (postero-lateral approach in Denmark but antero-lateral approach in Norway and Sweden). Approximately 96% are operated with posterior approach in Denmark whereas 23.8% and 60.3% were operated by posterior approach in Norway and Sweden, respectively.