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In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...

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Related Experiment Video

Updated: Jun 2, 2026

Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models

Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models

Published on: October 9, 2014

Strength of the Joshi External Stabilising System.

Rajeev Kumar¹, Anupam Gupta, V P Sharma

¹Department of Mechanical Engineering, Institute of Engineering and Technology, Lucknow, UP, India.

Journal of Orthopaedic Surgery (Hong Kong)

|April 27, 2011

Summary

This summary is machine-generated.

The Joshi External Stabilising System (JESS) shows limited strength for tibial fracture fixation, being only one-fourth as strong as the Ilizarov fixator. This makes it unsuitable for full weight-bearing activities.

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Area of Science:

Orthopedic biomechanics
Biomaterials science
Surgical device engineering

Background:

Tibial fractures require robust stabilization for effective healing.
External fixation devices offer an alternative to internal fixation, especially in complex cases.
Assessing the mechanical properties of new fixation systems is crucial for clinical application.

Purpose of the Study:

To evaluate the in vitro mechanical strength of the Joshi External Stabilising System (JESS).
To compare the JESS's performance against established benchmarks for tibial fracture stabilization.

Main Methods:

Mechanical testing of JESS constructs using cadaveric tibia and stainless steel rods.
Application of axial compressive load to failure using a universal testing machine.
Finite element analysis (FEA) to model JESS behavior under load and compare with experimental data.

Main Results:

The mean strength of the JESS was determined to be 32.5 N/mm experimentally and 35.3 N/mm via FEA.
A close agreement (8.4% difference) was observed between experimental and FEA results.
Interfragmentary displacement was found to be directly proportional to the applied axial compressive load.

Conclusions:

The JESS exhibits significantly lower strength compared to the Ilizarov fixator.
The JESS is not recommended for applications requiring full load-bearing capacity in tibial fracture stabilization.