Table 1.

Secondary outcome parameters

1.	polyethylene wear at 1, 3, 5 and 7 years postoperatively
2.	relative decrease/increase in acetabular bone mineral density (BMD) at 1 and 2 years postoperatively
3.	acetabular and proximal femoral osteolytic changes at 1, 3, 5, 7 and 10 years postoperatively
4.	patient-reported functional outcome (HOOS and SQUASH) at 6 weeks and at 1, 3, 5, 7 and 10 years postoperatively
5.	physician-reported functional outcome (Harris Hip Score) at 6 weeks and at 1, 3, 5 and 10 years postoperatively
6.	survival (number of revisions) determined at 5 and 10 years postoperatively

Other study parameters: gender, age, BMI, severity of arthrosis, complications, size and inclination of the cup, surgical time and intraoperative blood loss.