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Related Experiment Video

Updated: Dec 9, 2025

In Vivo Quantification of Hip Arthrokinematics during Dynamic Weight-bearing Activities using Dual Fluoroscopy
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Modular Dual-Mobility Liner Malseating: A Radiographic Analysis.

Brian P Chalmers1, Jeremy Dubin1, Geoffrey H Westrich1

  • 1Department of Orthopedic Surgery, Adult Reconstruction and Joint Replacement, Hospital for Special Surgery, New York, NY, USA.

Arthroplasty Today
|September 14, 2020
PubMed
Summary
This summary is machine-generated.

Malseating of modular dual-mobility (MDM) liners in total hip arthroplasty occurred in 1.3% of cases. Consistent surgical technique for testing liner seating resulted in a low incidence of malseating, with no short-term clinical implications observed.

Keywords:
DislocationDual mobilityInstabilityIntraprosthetic dislocationLiner dissociationLiner malseatingModular dual mobilityTotal hip arthroplasty

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Area of Science:

  • Orthopedic Surgery
  • Biomaterials Engineering
  • Radiology

Background:

  • Dislocation is a major cause of revision surgery after total hip arthroplasty (THA).
  • Modular dual-mobility (MDM) constructs are increasingly used to reduce THA instability.
  • Modularity introduces potential complications, such as liner malseating.

Purpose of the Study:

  • To radiographically analyze the incidence of MDM liner malseating.
  • To evaluate the early clinical outcomes associated with MDM liner malseating.

Main Methods:

  • Retrospective analysis of 305 primary THAs using MDM liners from a single manufacturer.
  • Inclusion of patients with anteroposterior and cross-table lateral radiographs at ≥6 weeks postoperatively.
  • Assessment of dislocations and reoperations at 1-year follow-up; intraoperative 4-quadrant test for liner seating.

Main Results:

  • Radiographic malseating of MDM liners was observed in 1.3% (4/305) of cases.
  • Malseating was more frequent in thinner 2D ongrowth shells (2.0%) than thicker 3D shells (0.6%).
  • No MDM liner dissociations or dislocations occurred within 1 year; 1.6% of patients required unrelated reoperations.

Conclusions:

  • Surgeons must be aware of the potential for MDM liner malseating.
  • A consistent surgical technique for testing liner seating yielded a low radiographic incidence of malseating (1%).
  • While no short-term clinical issues were noted, long-term follow-up is necessary.