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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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Solid screw insertion for tension band plates: a surgical technique tip.

Muayad Kadhim¹, Ahmed I Hammouda^1,2, John E Herzenberg³

¹Rubin Institute for Advanced Orthopedics, Sinai Hospital of Baltimore, 2401 West Belvedere Avenue, Baltimore, MD, 21215, USA.

Journal of Children'S Orthopaedics

|June 18, 2016

Summary

This study presents a surgical technique for accurately inserting solid screws with tension band plates (TBPs) in pediatric patients, especially those with high body mass index, to prevent screw fracture and improve deformity correction.

Keywords:

Bone screws Growth modulation Tension band plate

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Area of Science:

Orthopedic surgery
Pediatric orthopedics
Biomedical engineering

Background:

Tension band plates (TBPs) and cannulated screws are standard for pediatric lower extremity angular deformities.
Solid screws offer an alternative to cannulated screws, reducing fracture risk in obese children.
Accurate placement of solid screws can be challenging.

Purpose of the Study:

To describe a novel surgical technique for precise insertion of solid screws with TBPs.
To address the challenge of accurate solid screw placement in pediatric orthopedic surgery.

Main Methods:

The technique involves initial guidewire insertion through the physis, similar to conventional methods.
A cannulated drill bit is used to create a partial cortical breach.
A cannulated screw is utilized as a tap to pre-form the screw tract before solid screw insertion.

Main Results:

The described technique was successfully applied in five pediatric patients.
Four patients had Blount disease, and one had bilateral genu varum.
The technique facilitated accurate placement of solid screws.

Conclusions:

Solid screws with TBPs are recommended for high body mass index pediatric patients to prevent screw fracture.
The described technique ensures accurate solid screw insertion by creating a tapped tract.
This method prevents deviation of solid screws, enhancing surgical outcomes in angular deformity correction.