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Cyclic axial loading of spinal implants.

R J Nasca, J M Hollis, J E Lemons

    Spine
    |November 1, 1985
    PubMed
    Summary
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    The Harrington distraction rod offers superior resistance to axial compression compared to paired wired L-rods, allowing less spinal shortening and displacement. This study highlights its better performance in resisting spinal loading.

    Area of Science:

    • Spinal biomechanics
    • Orthopedic implant performance
    • Spine instrumentation evaluation

    Background:

    • Spinal fusion surgery often requires instrumentation to stabilize the spine.
    • Harrington distraction rods and Luque (L) rods are commonly used spinal implants.
    • Understanding the biomechanical performance of these implants under load is crucial for clinical decision-making.

    Purpose of the Study:

    • To compare the performance of Harrington distraction rods with paired wired L-rods under cyclic axial compression.
    • To evaluate the spinal displacement and stability provided by each instrumentation type.

    Main Methods:

    • Twelve fresh frozen swine spines were instrumented with either Harrington distraction rods or paired wired L-rods.
    • Spines were subjected to cyclic axial compression loading in a pneumatic testing device.

    Related Experiment Videos

  • Load-displacement curves were generated to quantify spinal response.

    • Main Results:

    • Harrington rods allowed 0.5 cm of shortening, while L-rods permitted 1.5 cm.
    • L-rods showed friction, metallic debris, and greater coronal plane displacement.
    • Harrington rods demonstrated less sagittal plane displacement and rotation compared to L-rods.

    Conclusions:

    • Harrington distraction rods provide superior resistance to axial compression loading compared to paired wired L-rods.
    • Clinicians should consider the Harrington system's better stability in axial and coronal planes.
    • The Luque system may be less effective in resisting imposed axial compression loads.