In order to investigate the role of acetabular cup screw holes for the transport of osteolysis-inducing particles in a total hip arthroplasty articulation, the investigators compare the amount of bone loss around acetabular cups with and without holes. Bone loss is measured with computed tomography at 7 years and 15 - 18 years of follow-up.
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Periacetabular osteolysis frequency change between 7 and 18 years
Timeframe: Change between 7 to 18 years after surgery
Periacetabular osteolysis size change between 7 and 18 years
Timeframe: Change between 7 to 18 years after surgery