Early acetabular cup migration is associated with long-term aseptic loosening: investigation of 1-year and 2-year radiostereometric analysis cohort migration thresholds against acetabular cup survivorship from two national registries

Background and purpose: 2-year proximal migration thresholds for acetabular cups used at primary total hip arthroplasty were first established in 2012 by matching radiostereometric analysis (RSA)…