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Related Experiment Videos

Anterior vertebral screw strain with and without solid interspace support.

D A Spiegel1, B W Cunningham, I Oda

  • 1Division of Orthopaedic Surgery, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania 19104, USA.

Spine
|November 7, 2000
PubMed
Summary
This summary is machine-generated.

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Anterior spinal instrumentation can fail at end levels. Adding threaded cortical bone dowels to solid rod constructs increased stiffness and reduced strain at end screws during lateral bending, potentially improving fixation.

Area of Science:

  • Spine biomechanics
  • Orthopedic implant analysis
  • Vertebral instrumentation

Background:

  • Anterior instrumentation offers improved correction but has higher rates of nonunion and implant failure, often at end levels.
  • Understanding strain at the bone-screw interface is crucial for preventing fixation loss.
  • Previous studies highlight end-level failure as a common complication.

Purpose of the Study:

  • To evaluate bone-screw interface strain at end levels during physiologic loading.
  • To determine if solid interspace support, using threaded cortical bone dowels, reduces segmental strain on anterior implants.
  • To compare construct stiffness with and without dowel augmentation.

Main Methods:

  • In vitro biomechanical testing of a bovine spine model (n=8).

Related Experiment Videos

  • Sequential testing: intact, anterior solid rod with rib grafts, and anterior solid rod with threaded cortical bone dowels (L2-L5).
  • Mechanical loading included axial compression and lateral bending; screw strain and construct stiffness were measured.

    • Main Results:

    • Higher strain occurred at end screws during lateral bending toward the implant, similar for rib and dowel groups.
    • Dowel augmentation decreased end-level strain in lateral bending away from the implant compared to rib grafts.
    • Both augmentation methods increased construct stiffness, with dowels yielding greater stiffness than the intact condition and rib grafts.

    Conclusions:

    • Increased strain at end screws during lateral bending correlates with clinical failure patterns.
    • Threaded cortical bone dowels enhance anterior construct stiffness and reduce critical end-level strain.
    • Further research should focus on improving fixation at end screws, with this model aiding evaluation of new strategies.