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European Journal of Orthopaedic Surgery & Traumatology

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01-04-2019 | Up-to date Review and Case Report • HIP¨- ARTHROPLASTY

Modular femoral neck failure after revision of a total hip arthroplasty: a finite element analysis

Authors: Jan Zajc, Jožef Predan, Nenad Gubeljak, Andrej Moličnik, Samo K. Fokter

Published in: European Journal of Orthopaedic Surgery & Traumatology | Issue 3/2019

Abstract

The authors report on a case of modular femoral neck fracture which appeared 21 months after revision of acetabular component. The revision surgery was performed 8 years after the primary total hip arthroplasty due to aseptic loosening of the acetabular component. During acetabular revision, the primary implanted short (S, − 3.5 mm) femoral head was also exchanged with extra-long (XL, + 7.0 mm) femoral head fitting the modular femoral neck with a longer lever arm. Numerical analysis has shown that this has resulted in a 19.9% increase in tensile stress at the neck–stem coupling during normal walking cycle. This could result in microcrack initiation and propagation and finally lead to modular neck failure of the otherwise well-fixed stem. Surgeons should avoid excessive loading of the exchangeable neck (dual-modular) femoral stem designs as the stem–neck couplings are subject to corrosion and are not as reliable as monoblock stems.

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Title: Modular femoral neck failure after revision of a total hip arthroplasty: a finite element analysis
Authors: Jan Zajc
Jožef Predan
Nenad Gubeljak
Andrej Moličnik
Samo K. Fokter
Publication date: 01-04-2019
Publisher: Springer Paris
Published in: European Journal of Orthopaedic Surgery & Traumatology / Issue 3/2019
Print ISSN: 1633-8065
Electronic ISSN: 1432-1068
DOI: https://doi.org/10.1007/s00590-018-2314-8

At a glance: The STEP trials

Springer Medicine

Modular femoral neck failure after revision of a total hip arthroplasty: a finite element analysis

Abstract

At a glance: The STEP trials

Springer Medicine

Abstract

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