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Outcomes of a Cementless Nonmodular Dual Mobility Acetabular Cup Inserted via Posterior Approach Without Technology:
Vishal Sundaram1, Braden V Saba1, Andrew White1
1NYU Langone Orthopedic Hospital, NYU Langone Health, New York, New York.
The Journal of Arthroplasty
|April 19, 2026
Summary
Non-modular dual mobility cups in total hip arthroplasty show excellent outcomes, with no dislocations in 604 cases. This study supports their use for stable hip replacements.
Area of Science:
- Orthopedic Surgery
- Biomaterials Science
- Medical Device Engineering
Background:
- Non-modular dual mobility (DM) articulations in total hip arthroplasty (THA) are designed to minimize dislocation risk and wear.
- While not yet common in the US, DM cups may offer dislocation protection.
Purpose of the Study:
- To evaluate the clinical outcomes of cementless, non-modular DM acetabular cups in primary THA.
- Assess dislocation rates, revision rates, and implant survivorship at a minimum two-year follow-up.
Main Methods:
- Retrospective review of 604 primary THAs using cementless non-modular DM acetabular cups.
- Surgeries performed via posterior approach by a single surgeon, using digital templating and manual instruments.
- Collected data on 90-day readmission/revision rates, reasons for revision, and dislocations.
Main Results:
- High implant survivorship of 99.8% for all-cause and aseptic acetabular cup revision at a mean 2.0-year follow-up.
- Zero dislocations observed; no revisions for instability.
- Six revisions occurred for other reasons: cup dissociation (1), periprosthetic femoral fracture (2), femoral loosening (1), and periprosthetic joint infection (2).
Conclusions:
- Cementless non-modular DM acetabular cups demonstrate excellent clinical outcomes in primary THA.
- High implant survivorship and absence of dislocations support their use for achieving stability and fixation.
- Viable option for THA, even with a posterior approach and without advanced enabling technology.
