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Failure analysis of a total hip prosthesis implanted in active patient
M A L Hernandez-Rodriguez1, J A Ortega-Saenz, Geo R Contreras-Hernandez
1Universidad Autónoma de Nuevo León, FIME, CIIDIT, Mexico. malhdz@gmail.com
Journal of the Mechanical Behavior of Biomedical Materials
|September 10, 2010
Summary
A fractured total hip prosthesis stem in a male patient was analyzed. Fatigue crack propagation due to high stress concentration at the anterolateral corner caused premature failure.
Area of Science:
- Biomaterials Science
- Mechanical Engineering
- Orthopedic Surgery
Background:
- Premature failure of total hip prostheses can lead to revision surgeries.
- Understanding failure mechanisms is crucial for improving implant design and longevity.
Purpose of the Study:
- To investigate the cause of premature failure of a total hip prosthesis stem.
- To identify the origin and propagation mechanism of the fracture.
Main Methods:
- Visual inspection of the fractured femoral stem.
- Microscopic analysis using optical microscopy (OM) and scanning electron microscopy (SEM).
- Elemental analysis using energy-dispersive spectroscopy (EDS).
Main Results:
- The fracture originated from a high stress concentration at the anterolateral corner of the stem.
- Surface discontinuities acted as crack initiation sites.
- The crack propagated via fatigue, leading to catastrophic failure under patient load.
Conclusions:
- The premature failure was attributed to fatigue crack propagation initiated at a stress-concentrated region.
- Implant surface integrity and stress distribution are critical factors in total hip prosthesis survival.
- Design considerations should address stress risers to prevent fatigue failure in orthopedic implants.
