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 .
100 Cemented Versus 100 Noncemented Stems With Comparison of 25 Matched Pairs
Two series of 100 consecutive primary total hip arthroplasties , each using a single design of noncemented or cemented femoral component ( all 28 mm heads ) , were compared . One cemented and two noncemented stems underwent revision for aseptic loosening . Of unrevised hips , outcome data statistically favored cemented , rather than noncemented , stems . The data for cemented and noncemented stems , respectively , were : An excellent to good result in 97 % versus 88 % ; thigh pain in 3 % versus 40 % ; subsidence in 0 % versus 22 % ; and endosteal cavitation in 6 % versus 12 % . For patients with 25 unrevised matched pairs , selected by gender , age , diagnosis , and weight , outcome data also statistically favored cemented over noncemented stems , respectively : an excellent or good result in 25 versus 20 hips ; thigh pain in two versus eight hips ; and subsidence in none versus six hips . Midterm followup data for these concurrent total hip arthroplasty series of a mid1980s design revealed prevalence of mechanical failure of 1 % for cemented stems and 4 % for noncemented stems . Corroborating matched pair comparison neutralized selection bias as a causative factor for these differences . These data indicate contemporary cemented femoral stem fixation is superior to second generation noncemented femoral stem fixation . Controlled comparative studies at midterm to long term followup , such as in this report , are needed to define outcome and indications for current third generation noncemented stem fixation
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 .