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Archives of Orthopaedic and Trauma Surgery

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05.10.2023 | Hip Arthroplasty

Biomechanical analysis of different THA cementless femoral stem designs in physiological and osteoporotic bone during static loading conditions

verfasst von: Matteo Formica, Andrea Zanirato, Edoardo Bori, Tullio Andrea Revetria, Juljana Ditting, Bernardo Innocenti

Erschienen in: Archives of Orthopaedic and Trauma Surgery | Ausgabe 2/2024

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Abstract

Background

The influence of THA stem design on periprosthetic femoral fractures (PFFs) risk is subject of debate. This study aims to compare the effects of different cementless stem designs on stress–strain distributions in both physiological and osteoporotic femur under various loading conditions.

Materials

A biomechanical study using finite-element analysis was conducted. Four models were developed: three with implanted femurs and a native one chosen as control. Each model was analyzed for both healthy and osteoporotic bone. The following stem designs were examined: short anatomical stem with femoral neck preservation, double-wedge stem, and anatomical standard stem. Three loading conditions were assessed: gait, sideways falling, and four-point bending.

Results

During gait in physiological bone, the anatomical stem and the short anatomical stem with femoral neck preservation showed stress distribution similar to the native model. The double-wedge stem reduced stress in the proximal area but concentrated it in the meta-diaphysis. In osteoporotic bone, the double-wedge stem design increased average stress by up to 10%. During sideways falling, the double-wedge stem exhibited higher stresses in osteoporotic bone. No significant differences in average stress were found in any of the studied models during four-point bending.

Conclusion

In physiological bone, anatomical stems demonstrated stress distribution comparable to the native model. The double-wedge stem showed uneven stress distribution, which may contribute to long-term stress shielding. In the case of osteoporotic bone, the double-wedge stem design resulted in a significant increase in average stress during both gait and sideways falling, potentially indicating a higher theoretical risk of PFF.

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Titel: Biomechanical analysis of different THA cementless femoral stem designs in physiological and osteoporotic bone during static loading conditions
verfasst von: Matteo Formica
Andrea Zanirato
Edoardo Bori
Tullio Andrea Revetria
Juljana Ditting
Bernardo Innocenti
Publikationsdatum: 05.10.2023
Verlag: Springer Berlin Heidelberg
Erschienen in: Archives of Orthopaedic and Trauma Surgery / Ausgabe 2/2024
Print ISSN: 0936-8051
Elektronische ISSN: 1434-3916
DOI: https://doi.org/10.1007/s00402-023-05080-w

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Biomechanical analysis of different THA cementless femoral stem designs in physiological and osteoporotic bone during static loading conditions