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Related Experiment Video

Updated: Feb 23, 2026

Minimally Invasive Treatment for Thoracolumbar Burst Fracture Using Sagittal Alignment Screws and A Trauma Reduction Device
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Achieving interfragmentary compression without special drilling technique or screw design.

Jonathan Eastman1, Bradley Deafenbaugh2, Blaine Christiansen1

  • 1Department of Orthopaedic Surgery, Davis Medical Center, University of California, 4860 Y Street, Suite 1700, Sacramento, 95817, California.

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|September 9, 2017
PubMed
Summary

Fully threaded screws do provide interfragmentary compression in fracture fixation, contrary to traditional teaching. This study found they achieve compression and increase insertional torque, with clinical applicability for pelvic surgeons.

Keywords:
fully threaded screwsinterfragmentary compressionpartially threaded screwssacral fracture

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Area of Science:

  • Orthopaedic Surgery
  • Biomechanical Engineering
  • Surgical Implant Technology

Background:

  • Traditional teaching posits fully threaded screws lack compression unless a glide hole is used.
  • Pelvic surgeons often use fully threaded screws for sacral fractures to prevent neuroforaminal stenosis.
  • Clinical observations suggest fully threaded screws do achieve compression.

Purpose of the Study:

  • To test the hypothesis that fully threaded screws do not produce interfragmentary compression.
  • To compare insertional torque between partially and fully threaded screws.
  • To investigate structural changes from screw insertion using micro CT.

Main Methods:

  • Fully and partially threaded 7.0 mm cannulated screws were inserted into synthetic bone blocks (normal and osteoporotic).
  • Compression achieved and maximal insertional torque were compared between screw types.
  • Micro computed tomography (CT) scans analyzed structural changes post-insertion.

Main Results:

  • Compression was achieved with fully threaded screws in both normal and osteoporotic bone models.
  • Maximal insertional torque was significantly higher for fully threaded screws.
  • Micro CT revealed local bone damage around fully threaded screws compared to partially threaded ones.

Conclusions:

  • Fully threaded screws generate interfragmentary compression without a glide hole.
  • Increased insertional torque with fully threaded screws is clinically manageable.
  • Findings challenge traditional beliefs regarding screw mechanics in fracture fixation.