Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Applications of Stress01:04

Applications of Stress

743
Consider a structure made of a boom and a rod designed to support a load. These two components are connected by a pin and stabilized by brackets and pins. The boom and the rod are detached from their supports to assess the different stresses imposed on this structure, and a free-body diagram is drawn. Then, all the forces applied, including the load acting on the structure, are identified. The reaction forces exerted on both the boom and the rod are computed using the equilibrium equations.
The...
743
Stability of structures01:14

Stability of structures

591
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,...
591
Frames: Problem Solving II01:26

Frames: Problem Solving II

542
Consider a hydraulic hoist supporting a load of 1 kN. Assuming a simplified schematic representation of this frame structure, the force acting on BD and BF members can be determined.
542
Stresses under Combined Loadings01:23

Stresses under Combined Loadings

524
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...
524
Frames01:30

Frames

872
Frames are essential components of various mechanical and structural systems used daily. These structures are known for their stability and ability to bear heavy loads. A frame is constructed using two-force and multi-force members, interconnected using pin joints. In contrast, trusses are made entirely of two-force members.
Frames are versatile and widely used in various applications such as structural supports for beams and columns, automobile chassis construction, and in the construction...
872
Frames: Problem Solving I01:24

Frames: Problem Solving I

1.1K
Consider a jib crane with an external load suspended from the pulley. The dimensions of the crane members are shown in the figure. A systematic analysis of the frame structure is required to determine the reaction forces at the pin joints, assuming that the pulleys are frictionless.
1.1K

You might also read

Related Articles

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

Sort by
Same author

Fatigue properties of the hoffmann-vidal external fixation apparatus.

Orthopedics·2014
Same author

Effects of PTH treatment on tibial bone of ovariectomized rats assessed by in vivo micro-CT.

Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA·2009
Same author

Micro-finite element simulation of trabecular-bone post-yield behaviour--effects of material model, element size and type.

Computer methods in biomechanics and biomedical engineering·2008
Same author

Indirect determination of trabecular bone effective tissue failure properties using micro-finite element simulations.

Journal of biomechanics·2008
Same author

Bone degeneration and recovery after early and late bisphosphonate treatment of ovariectomized wistar rats assessed by in vivo micro-computed tomography.

Calcified tissue international·2008
Same author

Load distribution in the healthy and osteoporotic human proximal femur during a fall to the side.

Bone·2007
Same journal

A Biomechanical Proof-of-Concept Study of Scaffold-Augmented Distraction Osteogenesis Using 3D-Printed Hyperelastic Bone™ in a Rabbit Tibial Lengthening Model.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society·2026
Same journal

Predicting Primary Stability of Stemless TSA From Preoperative Bone Density and Surgical Factors.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society·2026
Same journal

Locking Compression Plate Versus Dynamic or Limited Contact Dynamic Compression Plate Fixation for Forearm Fractures: A Systematic Review and Meta-Analysis.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society·2026
Same journal

Synovial Fluid Biomarkers Reflect Pre- and Postoperative Clinical Features in Rotator Cuff Tears, Independent of Tear Size.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society·2026
Same journal

Assessing Lateral Patellofemoral Dislocations on MRI: A Novel Contusion Grading Approach for Predicting Recurrence and Prognosis.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society·2026
Same journal

Associations Between Patient Characteristics and Cartilage T1ρ Relaxation Times Vary Over Time Following Patellar Dislocation.

Journal of orthopaedic research : official publication of the Orthopaedic Research Society·2026
See all related articles

Related Experiment Video

Updated: Mar 24, 2026

Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation
11:21

Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation

Published on: March 13, 2026

265

Guidelines for external fixation frame rigidity and stresses.

R Huiskes, E Y Chao

    Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
    |January 1, 1986
    PubMed
    Summary
    This summary is machine-generated.

    Engineers developed simple formulas to optimize external fracture fixation (EFF) devices. Adjusting parameters like side-bar separation can significantly alter frame rigidity and reduce pin stresses, minimizing complications like loosening and infection.

    More Related Videos

    Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
    10:09

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

    Published on: October 9, 2014

    23.4K
    Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects
    07:35

    Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects

    Published on: April 11, 2012

    18.9K

    Related Experiment Videos

    Last Updated: Mar 24, 2026

    Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation
    11:21

    Development of a Novel Internal Fixation Model for Rat Radial Fractures: Fracture Healing Assessment and Dorsal Root Ganglion Isolation

    Published on: March 13, 2026

    265
    Adjustable Stiffness, External Fixator for the Rat Femur Osteotomy and Segmental Bone Defect Models
    10:09

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

    Published on: October 9, 2014

    23.4K
    Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects
    07:35

    Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects

    Published on: April 11, 2012

    18.9K

    Area of Science:

    • Biomechanics
    • Biomedical Engineering
    • Orthopedic Surgery

    Background:

    • External fracture fixation (EFF) devices are crucial for bone fracture treatment.
    • Optimizing EFF design requires understanding the relationship between frame characteristics, rigidity, and stress concentrations.
    • Existing methods may lack simple analytical tools for design optimization.

    Purpose of the Study:

    • To develop simple approximate formulas relating EFF frame rigidity, pin stresses, and pin-bone interface stresses to key design parameters.
    • To provide guidelines for optimizing EFF configurations for both flexibility and stress reduction.
    • To aid in the design and application of EFF devices in clinical and experimental settings.

    Main Methods:

    • Utilized results from Finite Element Method (FEM) analyses and experimental data.
    • Applied analytical methods to derive approximate formulas.
    • Developed a nomogram for quick estimation of design relationships.

    Main Results:

    • Demonstrated the ability to vary EFF frame rigidity over a wide range (13 N/mm to 17,000 N/mm).
    • Showed a reduction in maximal pin and pin-bone stresses by a factor of 140 through parameter adjustment.
    • Identified specific parameters (side-bar separation, pin modulus) that can decrease rigidity while moderately increasing stresses.

    Conclusions:

    • The developed formulas offer valuable guidelines for balancing EFF flexibility and stress management.
    • Optimized parameter selection can reduce the risk of pin failure, loosening, and pin-tract infection.
    • The findings support the use of these analytical tools in EFF design and experimental applications.