Analysis of Dual Mobility Liner Rim Damage Using Retrieved Components and Cadaver Models

The Journal of Arthroplasty
Audrey K NebergallKartik Mangudi Varadarajan

Abstract

The objective of this study was to assess the retentive rim of retrieved dual mobility liners for visible evidence of deformation from femoral neck contact and to use cadaver models to determine if anterior soft tissue impingement could contribute to such deformation. Fifteen surgically retrieved polyethylene liners were assessed for evidence of rim deformation. The average time in vivo was 31.4 months, and all patients were revised for reasons other than intraprosthetic dislocation. Liner interaction with the iliopsoas was studied visually and with fluoroscopy in cadaver specimens using a dual mobility system different than the retrieval study. For fluoroscopic visualization, a metal wire was sutured to the iliopsoas and wires were also embedded into grooves on the outer surface of the liner and the inner head. All retrievals showed evidence of femoral neck contact. The cadaver experiments showed that liner motion was impeded by impingement with the iliopsoas tendon in low flexion angles. When observing the hip during maximum hyperextension, 0°, 15°, and 30° of flexion, there was noticeable tenting of the iliopsoas caused by impingement with the liner. Liner rim deformation resulting from contact with the femoral neck likely b...Continue Reading

References

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Citations

Oct 27, 2015·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Kartik Mangudi VaradarajanOrhun K Muratoglu
Oct 23, 2018·Expert Review of Medical Devices·Thomas NeriFrederic Farizon
Dec 4, 2019·Clinical Orthopaedics and Related Research·Julien WegrzynJacques Béjui-Hugues
Mar 10, 2017·Expert Review of Medical Devices·Hamed VahediJavad Parvizi
Dec 23, 2016·International Orthopaedics·Cécile BataillerSebastien Lustig
Feb 8, 2021·The Journal of Arthroplasty·Gwo-Chin LeeP Maxwell Courtney

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