Evidence brief
Dual Mobility Cups in Total Hip Arthroplasty
Dual mobility significantly reduces dislocation risk
Dislocation rates <1% vs 3-5% for standard implants
Mechanism: large effective head diameter, two articulation points
Concerns: intraprosthetic dislocation, wear at second articulation
Increasingly used in revision and high-risk primary THA
Dual mobility cups have emerged as an effective strategy for preventing dislocation in high-risk patients (revision, elderly, neuromuscular disease). Long-term data on wear and IPD is accumulating.
Know dual mobility indications: revision for instability, primary in high-risk patients (>75 years, cognitive impairment, neuromuscular disease, tumor). Understand mechanism (two articulations), potential complications (IPD, wear at capture mechanism). Reference AOANJRR data.
Bouchet R et al. Posterior approach and dislocation after primary total hip arthroplasty. A comparative study on 90 patients with or without dual-mobility cup. Int Orthop. 2011;35(9):1469-1473.
Level III
Retrospective comparative study or case-control study