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Dual Mobility Acetabular Systems for Total Hip Arthroplasty: A Multicenter Study and Technique Report
Hytham S Salem1, Steven F Harwin2, Geoffrey H Westrich3
1Northwell Health Orthopaedics, Lenox Hill Hospital, New York, New York.
Surgical Technology International
|November 27, 2020
Summary
Dual mobility total hip arthroplasty (THA) shows low malseating rates when surgeons use proper techniques. This study highlights surgical methods to prevent complications and ensure excellent patient outcomes.
Area of Science:
- Orthopedic Surgery
- Biomedical Engineering
- Arthroplasty Research
Background:
- Dual mobility constructs represent a significant advancement in total hip arthroplasty (THA), particularly for managing instability.
- Concerns regarding liner malseating with dual mobility THA exist, but appropriate surgical technique may mitigate this risk.
Purpose of the Study:
- To detail surgical techniques employed to ensure adequate liner seating in dual mobility THA.
- To report the incidence of malseating, dislocation, and aseptic loosening in a cohort of dual mobility THA patients.
Main Methods:
- Retrospective analysis of 1,322 patients undergoing dual mobility THA between 2010 and 2018 across four institutions.
- Exclusion criteria included less than two years of follow-up.
- Outcomes assessed included radiographic evidence of liner malseating, aseptic loosening, and dislocation.
Main Results:
- A low rate of liner malseating (0.15%) was observed, with no adverse sequelae in affected patients.
- The overall dislocation rate was 0.53%, and aseptic loosening occurred in 0.53% of cases.
- Revision THA patients had no malseating, but a 1.3% dislocation rate and 0.79% femoral component loosening rate.
Conclusions:
- Malseating is infrequent in dual mobility THA when meticulous surgical techniques are applied.
- The study emphasizes the importance of intraoperative care to ensure proper liner seating for optimal outcomes.
