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Updated: Oct 16, 2025

Design and Fabrication of an Elastomeric Unit for Soft Modular Robots in Minimally Invasive Surgery

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Published on: November 14, 2015

Malseating of modular dual mobility liners.

Jonathan Guntin¹, Darren Plummer¹, Craig Della Valle¹

¹Department of Orthopaedic Surgery, Rush University Medical Center, Chicago, Illinois, USA.

Bone & Joint Open

|October 18, 2021

Summary

This summary is machine-generated.

Dual mobility hip implant liners can become dislodged, with smaller component sizes increasing the risk. This study found a 5.0% incidence of malseating without immediate clinical consequences.

Keywords:

MDM Metal ion Univariate analysis acetabular components acetabular shell clinical outcomes dual mobility dual mobility implants malseating patient-reported outcome measures (PROMs)radiographs revision surgery revision total hip arthroplasties

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Area of Science:

Orthopedic Surgery
Biomedical Engineering
Radiology

Background:

Modular dual mobility liners are used in total hip arthroplasty.
Previous studies report a malseating incidence ranging from 5.8% to 16.4%.

Purpose of the Study:

Determine the incidence of dual mobility liner malseating at our institution.
Identify risk factors associated with liner malseating.
Evaluate the clinical impact of liner malseating on patient outcomes.

Main Methods:

Retrospective review of 239 total hip arthroplasties with modular dual mobility liners.
Radiographic assessment for malseating by two independent reviewers, with a third as tiebreaker.
Univariate analysis to identify risk factors and Youden's index for cut-off points.

Main Results:

A 5.0% incidence of radiological malseating was observed (12/239 liners).
Component size of 50 mm or less was significantly associated with malseating (p=0.031).
No associated clinical consequences or revision surgeries were noted at a mean follow-up of 14 months.

Conclusions:

The incidence of liner malseating is 5.0%, consistent with prior literature.
Smaller component size (<50 mm) is a risk factor for malseating.
Further investigation into implant design and instrumentation is recommended to mitigate malseating risk.