Dual Mobility Strategies in Total Hip Arthroplasty

Dual mobility designs in total hip arthroplasty combine a small femoral head articulating within a larger polyethylene liner that itself moves within a metal acetabular shell. This dual articulation enhances jump distance and reduces the risk of dislocation, addressing stability challenges in primary and revision hip replacement. Originally developed to manage instability in high-risk patients—such as those with neuromuscular disorders, hip dysplasia or femoral neck fractures—dual mobility implants have demonstrated reliable mid-term survivorship across diverse populations. Advances in porous metal coatings, ceramic surface treatments and refined polyethylene formulations seek to balance wear resistance with biological fixation. Registry and cohort data confirm preferential use of dual mobility in anatomically complex and revision scenarios, while biomechanical studies guide component orientation and head-liner combinations. Ongoing concerns include intraprosthetic dislocation and long-term polyethylene wear, prompting continual design optimisation and patient-specific risk stratification. Dual mobility strategies have thus become integral to a personalised approach in contemporary hip arthroplasty, with global uptake reflecting their practical benefits in reducing instability without compromising functional outcome.

Research from Nature Portfolio

Recent studies have demonstrated that dual mobility cups markedly lower postoperative dislocation in hip dysplasia patients undergoing total hip arthroplasty. In a multicentre cohort covering 2015–2020, the dual mobility group exhibited zero dislocations compared with a 9 percent rate in conventional fixed-bearing controls, while hip function scores remained equivalent. These findings underscore the stability advantage of dual articulation in anatomically deformed acetabula without detriment to range of motion or patient-reported outcomes.

Dual Mobility Strategies in Total Hip Arthroplasty publication trend

The graph below shows the total number of articles in dual mobility strategies in total hip arthroplasty across all publications each year (not limited to Nature Index journals).

Technical terms

Dual mobility cup: An acetabular implant featuring two articulating surfaces to increase stability and reduce dislocation risk.

Total hip arthroplasty (THA): Surgical reconstruction of the hip joint with prosthetic femoral and acetabular components.

Intra-prosthetic dislocation (IPD): Displacement of the femoral head from the polyethylene liner within a dual mobility construct.

Osseointegration: The process by which bone grows into a porous implant surface to secure biological fixation.

Tribology: The study of friction, lubrication and wear between interacting implant surfaces.

References

1. The use of dual mobility acetabular cups in total hip replacement reduces dislocation rates in hip dysplasia patients. Scientific Reports (2023).
2. Dual Mobility Hip Arthroplasty: Innovative Technological Advances. Prosthesis (2024).
3. Outcomes of dual-mobility acetabular cup for instability in primary and revision total hip arthroplasty. Journal of Orthopaedics and Traumatology (2014).
4. Use of dual-mobility cup in revision hip arthroplasty reduces the risk for further dislocation: analysis of seven hundred and ninety one first-time revisions performed due to dislocation, reported to the Swedish Hip Arthroplasty Register. International Orthopaedics (2017).
5. Wear of dual-mobility cups: a review article. International Orthopaedics (2016).
6. Risk factors and modes of failure in the modern dual mobility implant. A systematic review and meta-analysis. BMC Musculoskeletal Disorders (2021).