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Related Concept Videos

Self-Locking Screw01:16

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.
Frictional Forces on Screws01:17

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...
Screw: Problem Solving01:21

Screw: Problem Solving

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...
Upward Impending Motion01:21

Upward Impending Motion

A square-threaded screw jack is a mechanical device widely used for lifting heavy loads or applying considerable force. Its operation is based on converting the force applied at its handle into a torsional moment, causing the upward impending motion of the screw. This movement is accomplished by overcoming the static friction between the threads of the screw and the jack.
To better comprehend how a screw jack functions, consider the completely unraveled thread as a block in contact with the...
Wood Fasteners01:18

Wood Fasteners

In wood construction, fasteners are essential for securing components together, with the connection strength largely dependent on the direct bearing between members. Various types of fasteners are employed, each suited to specific applications and structural requirements.
Nails are the most common fasteners, consisting of sharp-pointed metal pins that are driven into wood using a hammer or a mechanical nail gun. They come in a variety of diameters, heads, and lengths. Nailing techniques include...
Steel Fastening Techniques01:17

Steel Fastening Techniques

Steel sections can be joined together through various fastening techniques including riveting, bolting, and welding, each suitable for different structural requirements and conditions.
Rivets are cylindrical steel fasteners with a specially designed head. During application, rivets are heated until white-hot and then inserted through pre-drilled holes in the steel sections. A pneumatic hammer is used to shape the exposed end into a second head, securing the sections together.
Bolting is another...

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Related Experiment Video

Updated: Jul 20, 2026

Creating Rigidly Stabilized Fractures for Assessing Intramembranous Ossification, Distraction Osteogenesis, or Healing of Critical Sized Defects
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Published on: April 11, 2012

What do you do when you have a loose screw?

Paul C Brady1, Paolo Arrigoni, Stephen S Burkhart

  • 1Arthrex, Inc, Naples, Florida, USA.

Arthroscopy : the Journal of Arthroscopic & Related Surgery : Official Publication of the Arthroscopy Association of North America and the International Arthroscopy Association
|September 6, 2006
PubMed
Summary

The dual-anchor interference fit technique significantly enhances suture anchor pullout strength in osteoporotic bone models. This method provides superior stability compared to single anchors, proving effective in clinical settings for loose screw situations.

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10:09

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

Published on: October 9, 2014

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Materials Science

Background:

  • Osteoporotic bone presents challenges for secure fixation of orthopedic implants.
  • Suture anchors are crucial for soft tissue reattachment in arthroscopic procedures.
  • Improving anchor stability in poor-quality bone is a significant clinical need.

Purpose of the Study:

  • To compare the pullout strength of various suture anchor configurations in an osteoporotic bone model.
  • To evaluate a novel interference fit technique using a second anchor to augment pullout resistance.
  • To assess the in vivo performance of the dual-anchor interference fit technique.

Main Methods:

  • Four groups of suture anchor constructs were tested: single 5.0-mm, 5.5-mm FT, and 6.5-mm Bio-Corkscrew anchors, and a dual-anchor interference fit.
  • Anchors were tested in polyurethane foam blocks simulating osteoporotic bone, measuring cyclic displacement, yield load, and extension at yield load.
  • The interference fit technique was applied in 18 arthroscopic shoulder cases with loose screws, followed by stability assessment.

Main Results:

  • The dual-anchor interference fit (Group IV) demonstrated the highest pullout strength (305 +/- 16 N), significantly exceeding all single anchor groups.
  • Pullout strength increased sequentially: 5.0-mm < 6.5-mm < 5.5-mm FT < dual-anchor interference fit.
  • The dual-anchor group showed significantly less cyclic displacement (1.4 mm +/- 0.2) than the 6.5-mm anchor group (1.9 mm +/- 0.3).

Conclusions:

  • The dual-anchor interference fit technique is the strongest construct for resisting pullout in osteoporotic bone models.
  • This technique proved effective in vivo, achieving stable constructs in 100% of cases involving loose screws.
  • The findings provide valuable data for surgeons selecting anchor constructs for osteoporotic bone and managing loose screws.