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Related Experiment Videos

Cervical stability after sequential capsule resection

T A Zdeblick1, J J Abitbol, D N Kunz

  • 1Division of Orthopedic Surgery, University of Wisconsin, Madison.

Spine
|October 15, 1993
PubMed
Summary
This summary is machine-generated.

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Resecting over 50% of the cervical facet capsule during posterior decompression can cause significant spinal instability. Surgeons should limit capsule resection to less than 50% to avoid postoperative hypermobility and potential need for stabilization.

Area of Science:

  • Spinal biomechanics
  • Orthopedic surgery

Background:

  • Posterior cervical decompression often requires facet joint capsule resection.
  • Current practice typically involves capsule removal only for fused joints.

Purpose of the Study:

  • To investigate the biomechanical effects of isolated facet capsule resection.
  • To determine the threshold of capsule resection leading to cervical spine instability.

Main Methods:

  • Seven human cervical cadaveric spines were tested.
  • Nondestructive biomechanical testing under axial load, flexion, extension, and torsion.
  • Sequential resection of 25%, 50%, 75%, and 100% of the C5-6 facet capsules.

Main Results:

  • Axial stiffness remained largely unchanged.

Related Experiment Videos

  • Torsional displacement increased significantly after 50% or greater capsule resection.
  • Flexion testing showed statistically significant increased displacement after 75% or 100% resection.
  • Significant hypermobility occurred with >50% capsule resection in torsion and flexion.

    • Conclusions:

    • Resection of greater than 50% of the cervical facet capsule can lead to significant hypermobility.
    • Careful limitation of facet capsule resection (<50%) is recommended during posterior cervical procedures.
    • Excessive capsule resection may necessitate postoperative stabilization.