Dual Mobility for Chronic Instability

A dual mobility cup consists of a large, fixed, porous coated acetabular component and a bipolar femoral component (a “tripolar” implant). The cup was developed to reduce the incidence of dislocation in patients at risk of instability who required primary or revision total hip replacement. The currently available long term clinical results indicate that the cup provides stability and is durable in this patient population. Recent new developments of the concept include: 1) an anatomically shaped shell; 2) use of highly crosslinked polyethylene; and 3) a modular shell.