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

Screw: Problem Solving01:21

Screw: Problem Solving

677
In mechanical engineering, the interaction between a threaded screw shaft and a plate gear involves analyzing the resisting torque on the plate gear that can be overpowered when a specific torsional moment is applied to the shaft. To better comprehend this concept, consider a generic situation with a threaded screw shaft with a given mean radius and lead and a plate gear with a specified mean radius. The coefficient of static friction between the screw and gear is also provided.
To evaluate the...
677
Self-Locking Screw01:16

Self-Locking Screw

2.4K
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.
2.4K
Frictional Forces on Screws01:17

Frictional Forces on Screws

1.5K
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...
1.5K
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

740
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the torque...
740
Design of Transmission Shafts - Stress Analysis01:15

Design of Transmission Shafts - Stress Analysis

704
Designing a transmission shaft requires a thorough understanding of the stresses induced by bending moments and torques, especially in systems where power is transferred through gears. These forces create force-couple systems at the centers of the shaft's cross-sections, leading to both transverse and torsional loading. Although shearing stresses from transverse loads are typically smaller than those from torques and are often overlooked, the significant normal stresses from these loads...
704
Machines: Problem Solving I01:22

Machines: Problem Solving I

670
A toggle clamp is a mechanical device commonly used for holding and clamping objects in various applications, such as woodworking, metalworking, and assembly operations. Consider a toggle clamp subjected to a force of 200 N at the handle. The vertical clamping force can be calculated, provided the dimensions of the toggle clamp are known.
The toggle clamp system is a machine structure consisting of movable, pin-connected multi-force members that form a stabilized system to transmit forces. The...
670

You might also read

Related Articles

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

Sort by
Same author

Are continuous locking headless bone screws with locking plate fixation effective for bridging fracture gaps in far cortical locking constructs? An in vitro biomechanical and finite element study under simplified axial loading.

Frontiers in bioengineering and biotechnology·2026
Same author

Biomechanical Comparison of Different Fixation Methods for Treating Jones Fracture of the Fifth Metatarsal.

Bioengineering (Basel, Switzerland)·2026
Same author

[Development Path and Driving Factors of Sink Enhancement and Emission Reduction in Shaanxi Province Based on STIRPAT-LEAP Modeling].

Huan jing ke xue= Huanjing kexue·2026
Same author

On Construction of Tibial Plateau Fracture Detection in Different Radiographic Views Using YOLO Models.

Diagnostics (Basel, Switzerland)·2026
Same author

Conservative treatments for non-surgically managed osteoporotic vertebral compression fractures: a network meta-analysis of long-term pain and quality of life.

Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA·2026
Same author

Utility of Quantitative and Semi-Quantitative SPECT/CT Metrics in Differentiating Mueller-Weiss Syndrome.

Diagnostics (Basel, Switzerland)·2026

Related Experiment Video

Updated: Jan 11, 2026

Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches
10:58

Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches

Published on: July 22, 2025

590

Mechanical optimization of plate-screw interfaces in variable-angle locking systems: a parametric study.

Chen-Chiang Lin1, Shun-Ping Wang2,3, Kun-Jhih Lin4

  • 1Department of Orthopedics, National Taiwan University Hospital Yunlin Branch, Yunlin, Taiwan.

Frontiers in Bioengineering and Biotechnology
|November 17, 2025
PubMed
Summary

Optimizing variable-angle locking systems (VALS) involves refining plate hole design. A specific design with a 1.3mm slot, three thread columns, and a 22° cone angle demonstrated superior mechanical stability for fracture fixation.

Keywords:
angulationbending momentbiomechanical studybone platevariable angle locking

More Related Videos

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
09:04

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

Published on: June 1, 2022

3.6K
Application of Design Aspects in Uniaxial Loading Machine Development
05:23

Application of Design Aspects in Uniaxial Loading Machine Development

Published on: September 19, 2018

6.3K

Related Experiment Videos

Last Updated: Jan 11, 2026

Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches
10:58

Parametric Optimization Design Method for Friction Plates of Hydro-Viscous Clutches

Published on: July 22, 2025

590
A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump
09:04

A Modeling and Simulation Method for Preliminary Design of an Electro-Variable Displacement Pump

Published on: June 1, 2022

3.6K
Application of Design Aspects in Uniaxial Loading Machine Development
05:23

Application of Design Aspects in Uniaxial Loading Machine Development

Published on: September 19, 2018

6.3K

Area of Science:

  • Orthopedic biomechanics
  • Surgical device engineering

Background:

  • Variable-angle locking systems (VALS) enhance surgical flexibility with off-axis screw insertion.
  • Clinical use faces challenges like screw loosening and limited mechanical stability data.

Purpose of the Study:

  • To evaluate how plate hole design parameters affect the locking strength of the plate-screw head interface.
  • To analyze this impact under various screw insertion angles for optimizing VALS in fracture fixation.

Main Methods:

  • Investigated a Point-Loading Thread-In variable-angle locking system.
  • Varied locking hole parameters: slot size (1.3mm vs. 1.5mm), thread columns (3 vs. 4), and cone angle (20° vs. 22°).
  • Tested screws inserted at 0°-15° angles using a cantilever load-to-failure test to determine ultimate bending moment and failure modes.

Main Results:

  • Bending strength decreased with increased screw angulation for all designs.
  • All designs exceeded 1 Nm at 0° but fell below 1 Nm at 15°.
  • The optimal design (1.3mm slot, 3 thread columns, 22° cone angle) exhibited the highest bending moment across all insertion angles.

Conclusions:

  • Plate hole design parameters (slot size, thread number, cone angle) significantly influence locking strength.
  • The optimal design provides superior mechanical stability for VALS.
  • Findings guide the optimization of VALS for improved fracture fixation outcomes.