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Fatigue

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Fatigue occurs when materials rupture under repeated or fluctuating loads, even at stress levels far below their static breaking strength. It typically results in brittle failure, even for ductile materials. It is a critical consideration in designing machines and structural components subjected to repetitive or varying loads. The nature of these loadings can range from fluctuating loads like unbalanced pump impellers causing vibrations to repeatedly bending a thin steel rod wire back and forth...

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Updated: Jun 13, 2026

Imaging of the Microstructural Failure Mechanism in the Human Hip

Imaging of the Microstructural Failure Mechanism in the Human Hip

Published on: September 29, 2023

Fatigue Fractures of First Generation Porous Coated Non-cemented Hip Prostheses.

W Plötz¹, I Schittich, H Rechl

¹Department of Orthopaedics of the Technical University of Munich, Germany.

Acta Chirurgiae Orthopaedicae Et Traumatologiae Cechoslovaca

|May 7, 2010

Summary

Fatigue fractures in porous coated total hip prostheses can occur due to increased tensile stresses and manufacturing weaknesses. Standardized processes and stem design are crucial for preventing fatigue fractures in cementless hip implants.

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Last Updated: Jun 13, 2026

Imaging of the Microstructural Failure Mechanism in the Human Hip

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Published on: September 29, 2023

Potentiodynamic Corrosion Testing

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Published on: September 4, 2016

Method and Instrumented Fixture for Femoral Fracture Testing in a Sideways Fall-on-the-Hip Position

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Published on: August 17, 2017

Area of Science:

Orthopedic surgery
Biomaterials science
Mechanical engineering

Background:

Non-cemented porous coated total hip prostheses are increasingly used, particularly in young, active patients.
Fatigue fractures of the prosthesis stem represent a significant clinical concern.
These fractures are often associated with high tensile stresses and implant design factors.

Purpose of the Study:

To investigate the causes of fatigue fractures in non-cemented porous coated total hip prostheses.
To highlight the biomechanical factors contributing to stem failure.
To propose recommendations for improving the design and manufacturing of these implants.

Main Methods:

Analysis of two case reports detailing fatigue fractures in porous coated total hip prostheses.
Examination of stress distribution in the prosthesis stem, considering surface irregularities and coating thickness.
Evaluation of the impact of manufacturing processes on stem integrity.

Main Results:

Fatigue fractures predominantly occur in areas of highest tensile stress.
Porous coating surface irregularities increase tensile stresses on the stem surface.
A thick porous coating reduces the stem's cross-sectional area, potentially weakening it.
The manufacturing process, including porous layer application, can compromise stem strength.

Conclusions:

Standardized manufacturing processes and rigorous fatigue strength testing are essential for cementless porous coated hip prostheses.
A minimum stem core diameter is recommended to mitigate the risk of fatigue fractures.
Further research into implant design and material properties is needed to enhance the longevity of these devices.