Conclusion Based on the current data , the use of DM acetabular components are effective in minimising the risk of instability after both primary and revision THA .
This benefit must be balanced against continuing concerns about the additional modularity , and the new mode of failure of intraprosthetic dislocation .
Aims The aim of this systematic review was to report the rate of dislocation following the use of dual mobility ( DM ) acetabular components in primary and revision total hip arthroplasty ( THA ) .
Clinical outcomes, survivorship and adverse events with mobile-bearings versus fixed-bearings in hip arthroplasty-a prospective comparative cohort study of 143 ADM versus 130 trident cups at 2 to 6-year follow-up.
The principle of dual mobility cups , often called " tripolar " , has been developed to overcome the problem of instability following primary hip arthroplasty . We prospect ively compared two cohorts which differed only by the type of bearings , i.e. " mobile bearing hip " ( MBH ) in a 143- study cohort of ADM cups versus " fixed bearing hip " ( FBH ) of 130 Trident PSL cups  , at a follow-up at 2 - 6years . The survival rates at 4.13-years , with instability as endpoint was significantly ( P=0.0176 ) in favor of mobile bearings at 100 % with no dislocation reported , versus 94.8 % with fixed bearings . These mobile bearings , matching both " modern " dual mobility cups and annealed highly crossed polyethylene , would appear to offer at longer follow-up a valuable solution to clinical outcomes in acetabular arthroplasty
Conclusion Based on the current data , the use of DM acetabular components are effective in minimising the risk of instability after both primary and revision THA .
This benefit must be balanced against continuing concerns about the additional modularity , and the new mode of failure of intraprosthetic dislocation .
Aims The aim of this systematic review was to report the rate of dislocation following the use of dual mobility ( DM ) acetabular components in primary and revision total hip arthroplasty ( THA ) .