Search research articles

ABOUT JoVE

Overview Leadership Blog JoVE Help Center

AUTHORS

Publishing Process Editorial Board Scope & Policies Peer Review FAQ Submit

LIBRARIANS

Testimonials Subscriptions Access Resources Library Advisory Board FAQ

RESEARCH

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archive

EDUCATION

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Faculty Resource Center Faculty Site

Terms & Conditions of Use

Related Concept Videos

Frictional Forces on Screws

Frictional Forces on Screws

Screws are characterized by a helical ridge known as a thread wrapped around a cylindrical shaft. They are commonly used as fasteners to hold objects together or to transmit power and motion in machines. One type of screw that is particularly useful for transmitting power is the square-threaded screw.
A jack with a square-threaded screw is a mechanical device used to lift heavy loads by applying a force at its handle. When the force is applied, the screw turns, raising the load. The screw can...

Self-Locking Screw

Self-Locking Screw

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. One of the key features that can make a screw jack more effective and reliable is its self-locking capability.
A square-threaded screw jack carrying a load is considered self-locking if the screw retains its position even after the moment applied to it is removed.

Fractures: Bone Repair

Fractures: Bone Repair

Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the procedure...

Plastic Deformation in Circular Shafts

Plastic Deformation in Circular Shafts

When materials are subjected to forces that surpass their yield strength, they undergo a process known as plastic deformation. This results in a permanent alteration or strain in their structure. This concept can be specifically applied to circular shafts, where the deformation leads to a change in its shape. The precise evaluation of this plastic deformation requires understanding the stress distribution within the circular shaft, which is achieved by calculating the maximum shearing stress in...

Normal Strain under Axial Loading

Normal Strain under Axial Loading

Normal strain under axial loading is an important concept in the field of mechanics of materials. Axial loading implies the application of a force along the axis of a material, like a column or bar. This force can either compress or stretch the material. In the context of axial loading, normal strain is the deformation experienced by the material in the direction of the loading force. It's calculated as the change in length divided by the original length of the material. This unitless ratio...

General Case of Eccentric Axial Loading

General Case of Eccentric Axial Loading

Unsymmetrical bending occurs when the bending moment applied to a structural member does not align with its principal axis. This misalignment leads to complex stress distributions and deflection patterns that differ from symmetrical bending, which are essential for designing structures to withstand different loading conditions.
Consider a member subjected to equal and opposite forces that are applied along a line that does not coincide with the member's neutral axis. In unsymmetrical bending,...

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by

Same author

Mechanical Characterization of Thrombi Retrieved With Endovascular Thrombectomy in Patients With Acute Ischemic Stroke.

Stroke·2021

Same author

Influence of multi-axial dynamic constraint on cell alignment and contractility in engineered tissues.

Journal of the mechanical behavior of biomedical materials·2020

Same author

Investigating the Mechanical Behavior of Clot Analogues Through Experimental and Computational Analysis.

Annals of biomedical engineering·2020

Same author

An experimental and computational investigation of the material behaviour of discrete homogenous iliofemoral and carotid atherosclerotic plaque constituents.

Journal of biomechanics·2020

Same author

Mechanical behavior of in vitro blood clots and the implications for acute ischemic stroke treatment.

Journal of neurointerventional surgery·2019

Same author

Thermodynamic Modeling of the Statistics of Cell Spreading on Ligand-Coated Elastic Substrates.

Biophysical journal·2018

Same journal

Influence of iliofemoral ligament laxity on hip joint contact forces during gait.

Journal of biomechanics·2026

Same journal

Associations of sagittal spinal alignment with shear wave velocity, thickness, and echo intensity of muscles attached to the spine and pelvis in healthy women.

Journal of biomechanics·2026

Same journal

The gait lab effect: symmetry restoration strategy after anterior cruciate ligament reconstruction is different in natural environments than the gait laboratory.

Journal of biomechanics·2026

Same journal

Mediolateral trunk control, rather than temporal gait control, is associated with treadmill walking adaptation in healthy older adults.

Journal of biomechanics·2026

Same journal

Examination of participant sex bias in international society of biomechanics conference abstract submissions: patterns across cohorts, countries, and contexts.

Journal of biomechanics·2026

Same journal

Shear wave velocity of biceps femoris and medial gastrocnemius in different positions and intensities: a cross-sectional study in healthy young males.

Journal of biomechanics·2026

See all related articles

Search research articles

Related Experiment Video

Updated: May 23, 2026

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model

Published on: May 31, 2017

Cortical bone failure mechanisms during screw pullout.

Emer M Feerick¹, J Patrick McGarry

¹Department of Mechanical and Biomedical Engineering, National University of Ireland, Galway, Ireland.

Journal of Biomechanics

|April 24, 2012

Summary

This summary is machine-generated.

This study reveals how bone structure affects screw removal. Different bone orientations lead to distinct crack patterns and forces during screw pullout, validated by novel experimental and computational models.

More Related Videos

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

Published on: November 8, 2024

Related Experiment Videos

Last Updated: May 23, 2026

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model

An Anesthesia, Surgery, and Harvest Method for the Evaluation of Transpedicular Screws Using an In Vivo Porcine Lumbar Spine Model

Published on: May 31, 2017

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device

Published on: November 8, 2024

Area of Science:

Biomaterials Engineering
Orthopaedic Biomechanics
Bone Tissue Mechanics

Background:

Cortical bone's anisotropic properties influence orthopaedic screw fixation.
Understanding screw pullout mechanics is crucial for implant design and failure analysis.

Purpose of the Study:

To experimentally and computationally investigate screw pullout from cortical bone.
To analyze the effect of osteon alignment on screw pullout failure mechanisms.
To develop and validate a computational model for predicting screw pullout behavior.

Main Methods:

A novel experimental setup with real-time imaging for screw pullout testing.
Screw pullout tests conducted with longitudinal and transverse osteon orientations.
Finite element analysis (FEA) incorporating material damage and crack propagation models.

Main Results:

Distinct failure mechanisms observed for longitudinal (vertical cracks) and transverse (horizontal cracks) pullout.
FEA with a bi-layered composite model accurately predicted experimental crack propagation and pullout forces.
Transverse pullout exhibited higher forces and horizontal crack paths compared to longitudinal pullout.

Conclusions:

Cortical bone microstructure significantly impacts screw pullout mechanics.
A bi-layered composite model effectively captures bone's anisotropic behavior in FEA.
Accurate modeling of bone microstructure is essential for predicting orthopaedic screw performance.