Mobile bearings in revision total knee arthroplasty

Mobile-bearing hinged knee replacement systems were used early on for primary and revision knee arthroplasty, but they were associated with high failure rates. Third-generation modular rotating platform hinged knee replacement systems have evolved with modular diaphyseal engaging slotted and splined stems and metaphyseal filling and loading sleeves. Additionally, significant improvement of the articulation between the rotating hinge mechanism and tibial component with broad congruent surfaces has decreased the deleterious stresses that contributed to the failures of earlier designs. The excellent mid-term results of the S-ROM modular mobile-bearing hinge and modular rotating plaform nonlinked knee replacement systems provide solid evidence for expanding the indications for rotating platform revision systems.