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The comprehensive anatomical spinal osteotomy classification.

Frank Schwab1, Benjamin Blondel, Edward Chay

  • 1*NYU Hospital for Joint Diseases, New York, New York; ‡Orthopedic Department, Aix-Marseille University, Marseille, France; §Washington University School of Medicine, St. Louis, Missouri; ‖Neurosurgery, University of California San Francisco, San Francisco, California; ¶Neurological Surgery, University of Virginia, Charlottesville, Virginia; #Spine Institute for Special Surgery, University of Louisville, Kentucky; **Maimonides Medical Center, New York, New York.

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Summary
This summary is machine-generated.

A new classification system for spinal osteotomies was developed to standardize surgical descriptions and improve comparisons of spinal deformity correction techniques. This system demonstrates high reliability among spine specialists.

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Area of Science:

  • Spine surgery
  • Orthopedic surgery
  • Surgical innovation

Background:

  • Global sagittal malalignment significantly impacts quality of life in spinal deformity patients.
  • Spinal osteotomies are increasingly used for rigid deformity patterns.
  • Lack of standardized techniques hinders outcome comparisons.

Purpose of the Study:

  • To propose an anatomically-based classification system for spinal osteotomies.
  • To establish a common language for spine specialists regarding osteotomy techniques.

Main Methods:

  • A 6-grade anatomic classification based on bone resection extent and destabilizing potential.
  • Inclusion of a surgical approach modifier (posterior or combined anterior/posterior).
  • Reliability assessment through reader analysis of 16 cases and Fleiss kappa coefficients.

Main Results:

  • High intraobserver reliability for resection type (kappa=0.96) and approach modifier (kappa=0.90).
  • High interobserver reliability for resection type (kappa=0.96) and approach modifier (kappa=0.88).
  • Classification deemed simple and consistent.

Conclusions:

  • The proposed system offers a consistent description of spinal osteotomies in deformity correction.
  • Reliability studies confirm the classification's simplicity and consistency.
  • This framework will aid osteotomy assessment and comparative treatment analysis.