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Modular dual-mobility cups using ceramic liners: an original solution for selected indications?
Rocco D'Apolito1, Guido Bandettini1, Filippo Maria Piana Jacquot1
1IRCCS Istituto Ortopedico Galeazzi, Hip Department, Milan, Italy.
Summary
This study found that using a ceramic liner in a dual mobility cup for revision hip replacement was safe and effective in preventing dislocation. Further research is needed for widespread adoption.
Area of Science:
- Orthopedic surgery
- Biomaterials science
Background:
- Dual mobility (DM) total hip arthroplasty (THA) enhances stability, particularly in revision cases and for patients at high risk of dislocation.
- Modular liners address limitations of monoblock DM cups.
- Ceramic liners offer an alternative to conventional cobalt-chromium liners in titanium shells, potentially mitigating issues associated with metal-on-metal bearings.
Purpose of the Study:
- To report outcomes of revision THA using modular DM cups with ceramic liners.
- To evaluate the safety and efficacy of this "off-label" use.
- To clarify the rationale for employing ceramic liners in this context.
Main Methods:
- Retrospective case series at a single institution.
- Inclusion of patients undergoing revision THA with modular DM cups and ceramic liners.
- Clinical and radiological follow-up at 1, 3, 6 months, and annually thereafter.
Main Results:
- Five patients received ceramic liners between 2014-2019 for instability, high dislocation risk, or complications from prior metal-on-metal THA.
- Mean age at surgery was 74 years, with a mean follow-up of 36 months.
- No dislocations or implant-related adverse events were recorded.
Conclusions:
- Ceramic liners in modular DM cups show promise for selected revision THA patients, offering potential advantages.
- Encouraging short-term results suggest safety and efficacy in this small cohort.
- Further extensive studies with larger patient numbers and longer follow-up are necessary before widespread adoption.
