INTERPRETATION There was a clinical ly relevant association between early migration of acetabular cups  and late revision due to loosening .
BACKGROUND AND PURPOSE The association between excessive early migration of acetabular cups  and late aseptic revision has been scantily reported .
We therefore performed 2 parallel systematic review s and meta-analyses to determine the association between early migration of acetabular cups  and late aseptic revision .
Wagner resurfacing hip arthroplasty. The results of one hundred consecutive arthroplasties after eight to ten years.
In a prospect i ve study of 100 consecutive Wagner resurfacing hip arthroplasties in ninety-three patients , the outcomes for all hips were determined for an eight to ten-year follow-up period . By survivorship analysis , the rate of survival of the arthroplasty was calculated to be 70 per cent at five years , but only 40 per cent at eight years . The major cause of failure was aseptic loosening of the acetabular or femoral component , or both . Fracture of the neck of the femur occurred in three hips . Although the medium-term results ( at fifty-six to eighty-three months ) were better than those in most comparable studies of resurfacing arthroplasty , the poor long-term results ( at ninety-one to 118 months ) show that meaningful studies of new prosthetic design s must continue for at least eight years , and , if at all possible , must include 100 per cent follow-up . The survival curve for the resurfacing arthroplasties in this study can serve as the basis for comparison of the early , medium , and long-term results of future design s of resurfacing hip prostheses
INTERPRETATION There was a clinical ly relevant association between early migration of acetabular cups  and late revision due to loosening .
BACKGROUND AND PURPOSE The association between excessive early migration of acetabular cups  and late aseptic revision has been scantily reported .
We therefore performed 2 parallel systematic review s and meta-analyses to determine the association between early migration of acetabular cups  and late aseptic revision .