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Related Concept Videos

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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Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
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Two-Screw Fixation of Scaphoid Waist Fractures.

Baris Yildirim1, D Nicole Deal1, A Bobby Chhabra1

  • 1Department of Orthopaedics, University of Virginia, Charlottesville, VA.

The Journal of Hand Surgery
|April 25, 2020
PubMed
Summary

Optimal fixation for scaphoid waist fractures may involve two screws, offering superior biomechanical stability and potentially higher union rates. This approach could enable earlier patient rehabilitation with increased confidence.

Keywords:
Open reduction internal fixationscaphoidscaphoid fracturescaphoid waist fracture

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Area of Science:

  • Orthopedic surgery
  • Traumatology
  • Biomedical engineering

Background:

  • Scaphoid waist fractures are common, and optimal fixation remains debated.
  • Current fixation options include single screw, dual screw, or plate fixation.

Purpose of the Study:

  • To evaluate the biomechanical advantages and clinical outcomes of two-screw fixation for scaphoid waist fractures.
  • To compare two-screw fixation with other methods regarding stability, union rates, and rehabilitation potential.

Main Methods:

  • Review of biomechanical studies comparing fixation methods.
  • Analysis of retrospective clinical studies on union rates.
  • Clinical experience with two-screw fixation for acute and nonunion scaphoid waist fractures.

Main Results:

  • Biomechanical studies consistently favor two-screw fixation for superior load to failure, displacement resistance, rotational stability, and stiffness.
  • Retrospective studies indicate a higher union rate with two screws.
  • Clinical experience shows promising results with all acute fractures healing and high union/low reoperation rates for nonunions treated with two screws.

Conclusions:

  • Two-screw fixation demonstrates significant biomechanical advantages for scaphoid waist fractures.
  • Clinical evidence suggests improved union rates and potentially earlier rehabilitation.
  • Further conclusive clinical data are needed, but current findings support two-screw fixation as a favorable option.