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International Orthopaedics

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01-03-2020 | Dynamic Hip Screw | Original Paper

Traditional and bionic dynamic hip screw fixation for the treatment of intertrochanteric fracture: a finite element analysis

Authors: Yunwei Cun, Chenhou Dou, Siyu Tian, Ming Li, Yanbin Zhu, Xiaodong Cheng, Wei Chen

Published in: International Orthopaedics | Issue 3/2020

Abstract

Purpose

The dynamic hip screw (DHS) is widely used for fixing intertrochanteric femur fractures. A porous bionic DHS was developed recently to avoid the stress concentration and risk of post-operative complications associated with titanium alloy DHSs. The purpose of this study was to compare the effects of traditional titanium alloy, bionic titanium alloy, and bionic magnesium alloy DHS fixation for treatment of intertrochanteric fractures using finite element analysis.

Methods

A three-dimensional model of the proximal femur was established by human computed tomography images. An intertrochanteric fracture was created on the model, which was fixed using traditional and porous bionic DHS, respectively. The von Mises stress, maximum principal stress, and minimum principal stress were calculated to evaluate the effect of bone ingrowth on stress distribution of the proximal femur after fixation.

Results

Stress concentration of the bionic DHS model was lower compared with traditional DHS fixation models. The von Mises stress, maximum principal stress, and minimum principal stress distributions of bionic magnesium alloy DHS models improved, along with simulation of the bone healing process and magnesium alloy degeneration, assumed to biodegrade completely 12 months post-operatively. The distribution of maximum principal stress in the secondary tension zone of the bionic DHS model was close to the intact bone. In the minimum principal stress, the region of minimum stress value less than − 10 MPa was significantly improved compared with traditional DHS models.

Conclusion

The bionic magnesium alloy DHS implant can improve the stress distribution of fractured bone close to that of intact bone while reducing the risk of post-operative complications associated with traditional internal fixations.

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Title: Traditional and bionic dynamic hip screw fixation for the treatment of intertrochanteric fracture: a finite element analysis
Authors: Yunwei Cun
Chenhou Dou
Siyu Tian
Ming Li
Yanbin Zhu
Xiaodong Cheng
Wei Chen
Publication date: 01-03-2020
Publisher: Springer Berlin Heidelberg
Keyword: Dynamic Hip Screw
Published in: International Orthopaedics / Issue 3/2020
Print ISSN: 0341-2695
Electronic ISSN: 1432-5195
DOI: https://doi.org/10.1007/s00264-019-04478-9

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Traditional and bionic dynamic hip screw fixation for the treatment of intertrochanteric fracture: a finite element analysis

Abstract

Purpose

Methods

Results

Conclusion

Keynote webinar | Spotlight on medication adherence

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusion

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