Cadaver-Specific Models for Finite-Element Analysis of Iliopsoas Impingement in Dual-Mobility Hip Implants

The Journal of Arthroplasty
Thomas ZumbrunnKartik M Varadarajan

Abstract

Joint dislocation is a major cause of failure in total hip arthroplasty. Dual-mobility implants provide a femoral head diameter that can match the native hip size for greater stability against dislocation. However, such large heads are prone to impingement against surrounding soft tissues. To address this concern, the concept of an anatomically contoured dual-mobility implant was evaluated using cadaver-specific finite-element analysis (FEA). The stiffness of 10 iliopsoas tendons was measured and also 3D bone models, contact pressure, and iliopsoas tendon stress were evaluated for 2 implant designs according to a previous cadaveric experiment. The iliopsoas interaction with an anatomically contoured and conventional dual-mobility implant was analyzed throughout hip flexion. The tensile test of cadaveric iliopsoas tendons revealed an average linear stiffness of 339.4 N/mm, which was used as an input for the FEA. Tendon-liner contact pressure and tendon von Mises stress decreased with increasing hip flexion for both implants. Average contact pressure and von Mises stresses were lower in the anatomically contoured design compared with the conventional implant across all specimens and hip flexion angles. This study was built upon a...Continue Reading

Citations

Sep 12, 2020·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Christian KlemtYoung-Min Kwon
Feb 8, 2021·The Journal of Arthroplasty·Gwo-Chin LeeP Maxwell Courtney
Sep 10, 2021·Zeitschrift für Orthopädie und Unfallchirurgie·Petri BellovaKlaus-Peter Günther

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