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Self-Locking Screw01:16

Self-Locking Screw

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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.
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Wood Fasteners01:18

Wood Fasteners

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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.
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Thin-Walled Hollow Shafts01:15

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In analyzing a thin-walled hollow shaft subjected to torsional loading, a segment with width dx is isolated for examination. Despite its equilibrium state, this segment faces torsional shearing forces at its ends. These forces are quantitatively described by the product of the longitudinal shearing stress on the segment's minor surface and the area of this surface, leading to the concept of shear flow. This shear flow is consistent throughout the structure, indicating a uniform distribution of...
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Steel Fastening Techniques01:17

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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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Frictional Forces on Screws01:17

Frictional Forces on Screws

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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...
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Related Experiment Video

Updated: Apr 23, 2026

Pedicle Screw Placement Using an Augmented Reality Head-Mounted Display in a Porcine Model
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Pedicle Screw Placement Using an Augmented Reality Head-Mounted Display in a Porcine Model

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Cannulated screw with solid core insert: stronger than cannulated screws.

John M Dundon1, Gregory C Gould, Michael A Herbenick

  • 1Department of Orthopaedic Surgery, Sports Medicine, and Rehabilition, Boonshoft School of Medicine, Wright State University, Dayton, OH. dundon.3@wright.edu.

American Journal of Orthopedics (Belle Mead, N.J.)
|September 25, 2014
PubMed
Summary
This summary is machine-generated.

Solid core screws demonstrate superior biomechanical strength compared to cannulated screws. Inserting a solid core into cannulated screws restores strength to levels comparable to solid core screws.

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Area of Science:

  • Orthopedic biomechanics
  • Biomaterials engineering
  • Surgical implant design

Background:

  • Cannulated screws are widely used in orthopedic surgery for fracture fixation.
  • Concerns exist regarding the biomechanical properties of cannulated screws compared to solid core screws.
  • Investigating modifications to cannulated screws may enhance their performance.

Purpose of the Study:

  • To compare the biomechanical properties (ultimate load, yield strength, fatigue strength) of solid core screws versus cannulated screws.
  • To evaluate the biomechanical effect of a solid core insert within a cannulated screw.
  • To assess if a modified cannulated screw can match the strength of a solid core screw.

Main Methods:

  • Five screw designs were tested: Synthes 4.5-mm solid core and cannulated, and prototype 4.0-mm solid core, cannulated, and cannulated with solid core insert.
  • Biomechanical testing using a 3-point bending model was performed.
  • Ultimate load, yield strength, and cycles to failure were measured for six screws of each design.

Main Results:

  • Synthes 4.5-mm cannulated screws showed significantly lower ultimate load, yield strength, and cycles to failure than Synthes 4.5-mm solid core screws.
  • Prototype 4.0-mm cannulated screws exhibited significantly lower biomechanical properties than both prototype solid core screws and prototype cannulated screws with solid core inserts.
  • No significant difference in biomechanical properties was observed between prototype cannulated screws with solid core inserts and prototype solid core screws.

Conclusions:

  • Cannulated screws possess inferior biomechanical strength compared to solid core screws.
  • The addition of a solid core insert to a cannulated screw effectively restores its biomechanical properties to those of a solid core screw.
  • This finding suggests a potential for improved performance and application of modified cannulated screw designs in orthopedic procedures.