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Updated: Sep 28, 2025

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

Improving acetabular shell deformation testing.

Brian G Beitler¹, Alexander Crich², Steven M Tommasini³

¹Department of Orthopaedics and Rehabilitation, Yale School of Medicine, New Haven, CT, USA.

Journal of the Mechanical Behavior of Biomedical Materials

|April 5, 2022

Summary

This summary is machine-generated.

We developed a low-cost, open-source method to test acetabular shell deformation, meeting ISO standards. This validated system uses readily available equipment, reducing expenses for crucial implant testing.

Keywords:

Acetabular shells Medical device design Shell deformation Total hip arthroplasty

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Area of Science:

Biomechanical Engineering
Medical Device Testing
Orthopedic Implants

Background:

Acetabular shells require rigorous testing for FDA approval to ensure structural integrity and prevent implant failure.
Current ISO 7206-12 standards necessitate expensive, single-purpose devices for measuring acetabular shell deformation.
Minimizing deformation under peak loads is critical for the longevity of acetabular implants.

Purpose of the Study:

To present an open-access, low-cost methodology for testing acetabular shell deformation.
To provide a validated alternative to expensive, specialized testing equipment.
To ensure compliance with ISO 7206-12:2016 standards for acetabular implant evaluation.

Main Methods:

Utilized a standard servohydraulic materials testing device (Instron) common in biomechanics labs.
Developed an inexpensive acetabular screw fastener as a versatile adaptor for various shell types.
Validated deformation measurements using optical data for enhanced accuracy.

Main Results:

The developed system effectively tests acetabular shell deformation.
Measurements obtained using the Instron device were validated optically.
Bland-Altman analysis showed a low standard deviation of bias (0.046 mm) and no significant systemic bias between methods.

Conclusions:

A low-cost, open-source system for testing acetabular shell deformation has been developed and validated.
The methodology meets ISO standards and offers a cost-effective solution for implant manufacturers.
This approach facilitates rigorous validation of acetabular shells, enhancing patient safety.