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Related Concept Videos

Method and Instrumented Fixture for Femoral Fracture Testing in a Sideways Fall-on-the-Hip Position06:58

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

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In this manuscript, we present a protocol to fracture test cadaveric proximal femora in a sideways fall on the hip configuration using instrumented fixtures mounted on a standard servo hydraulic frame. Nine digitized signals comprising forces, moments, and displacement along with two high speed video streams are acquired during...
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In this protocol, the femur surface strains are estimated during fracture testing using the digital image correlation technique. The novelty of the method involves application of a high-contrast stochastic speckle pattern on the femur surface, carefully specified illumination, high speed video capture, and digital image correlation analysis for strain calculations.
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Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis08:04

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We present a robust protocol on how to carefully preserve and prepare cadaveric femora for fracture testing and quantitative computed tomography imaging. The method provides precise control over input conditions for the purpose of determining relationships between bone mineral density, fracture strength, and defining finite element model geometry and...
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Related Experiment Video

Updated: Jan 20, 2026

Method and Instrumented Fixture for Femoral Fracture Testing in a Sideways Fall-on-the-Hip Position
06:58

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

Published on: August 17, 2017

10.4K

Mechanical testing setups affect spine segment fracture outcomes.

Asghar Rezaei1, Hugo Giambini2, Kent D Carlson3

  • 1Department of Physiology and Biomedical Engineering, Mayo Clinic, Rochester, MN, USA; Department of Orthopedic Surgery, Mayo Clinic, Rochester, MN, USA.

Journal of the Mechanical Behavior of Biomedical Materials
|September 4, 2019
PubMed
Summary
This summary is machine-generated.

Developing a reliable laboratory setup for studying spinal fractures is crucial. This study refined a testing fixture to accurately induce bending compression fractures in spine segments, improving experimental validity.

Keywords:
Biomechanical analysisFlexion bending momentMechanical testing fixtureSpine fractureSpine motion segment

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Related Experiment Videos

Last Updated: Jan 20, 2026

Method and Instrumented Fixture for Femoral Fracture Testing in a Sideways Fall-on-the-Hip Position
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Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis
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Proximal Cadaveric Femur Preparation for Fracture Strength Testing and Quantitative CT-based Finite Element Analysis

Published on: March 11, 2017

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Area of Science:

  • Biomechanics
  • Orthopedic Surgery
  • Spinal Research

Background:

  • Accurate biomechanical testing of spinal structures is essential for understanding fracture mechanisms.
  • Previous experimental setups have faced challenges in reliably inducing specific fracture types, such as flexion-induced injuries.

Purpose of the Study:

  • To design and validate an experimental testing configuration capable of generating bending compression fractures in a laboratory setting.
  • To optimize a fixture for applying off-centric compressive loading to create controlled flexion-type motion in three-level spine segments.

Main Methods:

  • A custom fixture was designed and fabricated to hold three-level spine segments.
  • Initial testing (Fixture A) involved off-centric compressive loading, with forces and moments measured by a six-channel load cell.
  • Modifications led to Fixture B, incorporating wedges to achieve consistent flexion-type loading, validated with synthetic and cadaveric specimens.

Main Results:

  • Fixture A unexpectedly produced extension outcomes in most specimens due to unintended shear forces.
  • Fixture B, utilizing a 15° wedge, consistently generated the intended flexion-type loading.
  • Significant differences in biomechanical parameters (force, moment, displacement) were observed between Fixture A and Fixture B.

Conclusions:

  • Fixture design critically influences experimental outcomes in spinal fracture testing.
  • The modified fixture (Fixture B) provides a more accurate method for inducing and studying bending compression fractures.
  • Optimized fixture design is paramount for reliable biomechanical analysis of spinal injuries.