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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,...

Eccentric Axial Loading in a Plane of Symmetry

Eccentric Axial Loading in a Plane of Symmetry

Eccentric axial loading occurs when an axial load is applied away from the centroidal axis of a structural member. This scenario is common in engineering, where structural elements may not be directly aligned due to various design or functional requirements.

Deformation of Member under Multiple Loadings

Deformation of Member under Multiple Loadings

When a rod is made of different materials or has various cross-sections, it must be divided into parts that meet the necessary conditions for determining the deformation. These parts are each characterized by their internal force, cross-sectional area, length, and modulus of elasticity. These parameters are then used to compute the deformation of the entire rod.
In the case of a member with a variable cross-section, the strain is not constant but depends on the position. The deformation of an...

Stresses under Combined Loadings

Stresses under Combined Loadings

When analyzing a bent tube with a circular cross-section subjected to multiple forces, it is crucial to determine the stress distribution in order to maintain structural integrity under varied load conditions.
The process begins by slicing the tube at critical points and analyzing the internal forces and stress components at these sections, focusing on the centroid. Normal stresses, generated by axial forces and bending moments, are either compressive or tensile and vary across the section from...

Eccentric Loading

Eccentric Loading

Eccentric loading is a crucial concept in the study of structural engineering and mechanics, particularly when analyzing the stability and stress distribution in columns. Unlike centric loading, where the force is applied along the centroidal axis, causing uniform compression, eccentric loading occurs when a force is applied off-center. This off-center application introduces not only direct compressive stress but also bending stress, significantly influencing the column's behavior under load.

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Athymic Rat Model for Evaluation of Engineered Anterior Cruciate Ligament Grafts

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Published on: March 26, 2015

ACL graft migration under cyclic loading.

Christian Staerke¹, Andreas Möhwald, Karl-Heinz Gröbel

¹Department of Orthopaedic Surgery, Otto-von-Guericke University Magdeburg, Leipziger Strasse 44, 39120, Magdeburg, Germany. Christian.Staerke@med.ovgu.de

Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA

|October 29, 2009

Summary

This summary is machine-generated.

Graft migration after anterior cruciate ligament (ACL) reconstruction occurs with cyclic loading, varying by fixation method. The Endobutton CL fixation showed significantly greater graft migration than biointerference screws or Bio-TransFix pins.

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Area of Science:

Orthopedic Surgery
Biomechanical Engineering
Sports Medicine

Background:

Elongation and migration of anterior cruciate ligament (ACL) grafts can compromise initial stability in ACL reconstructions.
Graft migration has been studied less frequently than graft elongation, particularly concerning the graft-fixation complex.
Understanding graft migration is crucial for improving ACL reconstruction outcomes and graft longevity.

Purpose of the Study:

To investigate whether cyclic tensile loads cause measurable graft migration in ACL reconstructions.
To compare graft migration across different graft and fixation combinations.
To determine if graft migration is technique-dependent and impacts initial graft stability.

Main Methods:

Three graft/fixation combinations were tested in human femora (n=7): bone-patellar tendon graft with biointerference screw (BPTG-IS), and porcine free tendon grafts with Bio-TransFix pin (FTG-TF) or Endobutton CL (FTG-EB).
Grafts were fitted with tantalum markers, and specimens were subjected to cyclic tensile loading (50-250 N, 800 cycles).
Marker positions were fluoroscopically tracked to calculate graft migration relative to intra-bone fiducial markers.

Main Results:

Graft migration was observed in all three tested groups.
The Endobutton CL (FTG-EB) group exhibited significantly greater migration (2.0 ± 1.3 mm) compared to BPTG-IS (0.3 ± 0.2 mm) and FTG-TF (0.7 ± 0.4 mm) groups (P < 0.01).
Average migration after 800 cycles varied significantly based on the fixation technique.

Conclusions:

Cyclic tensile loads induce measurable graft migration in ACL reconstructions.
Graft migration is dependent on the fixation technique, with Endobutton CL showing the highest migration.
These findings suggest that graft migration may contribute to the loss of initial stability and inform the selection of appropriate graft/fixation combinations.