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Related Experiment Videos

Sagittal alignment and the Bryan cervical artificial disc.

J Patrick Johnson1, Carl Lauryssen, Helen O Cambron

  • 1Cedars-Sinai Institute for Spinal Disorders, Los Angeles, California 90048, USA. johsonjp@cshs.org

Neurosurgical Focus
|January 8, 2005
PubMed
Summary
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Single-level Bryan cervical disc replacement caused a focal loss of lordosis. However, overall cervical spine sagittal alignment remained unchanged after one- or two-level arthroplasty.

Area of Science:

  • Spine surgery
  • Orthopedic biomechanics
  • Cervical spine anatomy

Background:

  • Cervical arthroplasty aims to preserve motion and alignment.
  • The Bryan cervical artificial disc is used for one- or two-level replacement.
  • Sagittal alignment is crucial for cervical spine function.

Purpose of the Study:

  • To evaluate sagittal alignment changes after Bryan cervical artificial disc arthroplasty.
  • To compare alignment after single-level versus two-level procedures.
  • To investigate the impact of endplate preparation on cervical spine curvature.

Main Methods:

  • Retrospective review of lateral cervical spine radiographs.
  • Analysis of 13 patients with 16 Bryan cervical artificial disc placements.

Related Experiment Videos

  • Measurement of regional and overall cervical sagittal curvature pre- and post-operatively.

    • Main Results:

    • Single-level arthroplasty showed a mean 4.7-degree reduction in lordosis at the treated level (p < 0.05).
    • Two-level arthroplasty did not result in significant changes in sagittal alignment.
    • Overall cervical spine lordosis remained stable after single-level procedures.

    Conclusions:

    • Bryan cervical disc arthroplasty can lead to focal kyphosis at single-level treated sites.
    • Overall sagittal alignment is maintained after single-level cervical arthroplasty.
    • Endplate milling during the procedure may influence sagittal alignment outcomes.