Outcomes of Augmented Dual Mobility Acetabular Cups

Area of Science:

• Orthopedic Surgery
• Arthroplasty
• Biomaterials

Background:

• Total hip arthroplasty (THA) in patients with acetabular bone defects carries high risks of dislocation and aseptic loosening.
• Limited research exists on uncemented and augmented dual mobility cups (DMC) for acetabular defects.

Purpose of the Study:

• To evaluate the efficacy of augmented DMC in patients with acetabular bone defects.
• To assess the rates of dislocation and bone integration with augmented DMC in this patient group.

Main Methods:

• A continuous multicenter study included 93 patients with acetabular bone loss (Paprosky 2A-3A) receiving augmented DMC.
• Indications included revisions for aseptic loosening, septic loosening, fractures, and primary arthroplasty.
• Clinical assessment used Harris hip and Merle d'Aubigné Postel scores; radiographic evaluation was performed.

Main Results:

• At a mean 5.3-year follow-up, overall cup survivorship was 94.6%, with 96.8% survivorship for aseptic loosening.
• Only 3% of patients experienced dislocation.
• Significant improvements in functional scores (MDP and HHS) were observed postoperatively.

Conclusions:

• Uncemented and augmented DMC provide satisfactory medium-term results in acetabular bone defects.
• This technique demonstrates low rates of dislocation and loosening.
• The study recommends augmented DMC for THA in patients with acetabular bone defects.