Published online Jul 18, 2014. doi: 10.5312/wjo.v5.i3.180
Revised: February 21, 2014
Accepted: April 17, 2014
Published online: July 18, 2014
Core tip: Instability remains a significant issue after both primary and revision total hip arthroplasty. Dual mobility or tripolar unconstrained acetabular components can provide a viable alternative in preventing and treating instability. Reported outcomes of several European studies using dual mobility cups with mid- to long-term follow up support their effectiveness. Concerns such as intra-prosthetic dislocation and accelerated wear have been emphasized, although they seem to be less significant in older, low-demand patients. The use of dual mobility cups in younger patients should be viewed with caution based on a lack of current data concerning this high demand patient population.