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Dual mobility cemented cups have low dislocation rates in THA revisions
Frantz L Langlais1, Mickaël Ropars, François Gaucher
1University Hospital, 16 boulevard de Bulgarie, 35203 Rennes, France.
Clinical Orthopaedics and Related Research
|January 16, 2008
Summary
Cemented dual mobility cups in total hip arthroplasty (THA) revisions significantly reduce dislocation risk in high-risk patients over 70. This approach offers improved stability without increasing loosening rates, showing a 94.6% cup survival at 5 years.
Area of Science:
- Orthopedic Surgery
- Biomaterials Engineering
Background:
- Total hip arthroplasty (THA) revisions carry a high risk of dislocation, particularly in elderly patients.
- Standard cups have high dislocation rates (5.1-14.4%), while constrained tripolar cups reduce dislocation (6%) but increase loosening (9%).
Purpose of the Study:
- To evaluate the efficacy of non-constrained dual mobility cups in reducing dislocation and loosening in THA revisions.
- To assess prosthetic stability and cup survival in high-risk patients undergoing THA revision with cemented dual mobility cups.
Main Methods:
- Implantation of 88 cemented dual mobility cups in 82 patients (average age 72) at high risk for dislocation.
- Follow-up of 85 hips for 2 to 5 years to assess dislocation, loosening, and radiographic lucencies.
Main Results:
- A low traumatic dislocation rate of 1.1% was observed.
- Asymptomatic early loosening occurred in 2.3% of patients, with 3.5% showing localized radiographic lucencies.
- Cup survival rate was 94.6% at 5-year follow-up.
Conclusions:
- Cemented dual mobility cups demonstrate a low dislocation rate and high cup survival in THA revisions for patients at risk.
- These findings suggest dual mobility cups are a superior alternative to constrained cups for preventing recurrent dislocation and loosening.