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Related Experiment Video

Updated: Sep 11, 2025

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A TACAF-based classification system for thoracic posterior longitudinal ligament ossification.

Shunmin Wang1,2, Yangzi Yang1, Tiefeng Li1

  • 1Ethics Committee of Changzheng Hospital, Shanghai, China.

European Journal of Orthopaedic Surgery & Traumatology : Orthopedie Traumatologie
|August 18, 2025
PubMed
Summary

A new classification system for thoracic ossification of the posterior longitudinal ligament (OPLL) reliably guides surgical approach selection. This system demonstrates clinical validity and improves patient outcomes.

Keywords:
Classification surgeryThoracic OPLLThoracic myelopathy

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Area of Science:

  • Neurosurgery
  • Spinal Surgery
  • Orthopedics

Background:

  • Ossification of the posterior longitudinal ligament (OPLL) in the thoracic spine presents diagnostic and surgical challenges.
  • Current classification systems lack standardization for guiding surgical interventions.

Purpose of the Study:

  • To evaluate the reliability and clinical applicability of a novel classification system for thoracic OPLL.
  • To assess its utility in guiding surgical approach selection for anterior controllable ante-displacement fusion (TACAF).

Main Methods:

  • A novel classification system based on OPLL severity (Grades 1-4), location (Zones A-B), and arc morphology was developed.
  • System reliability was assessed by 20 surgeons evaluating 50 cases using Fleiss kappa coefficients for inter- and intra-observer agreement.
  • Clinical validation involved analyzing demographic and perioperative data from 50 patients, including neurological function (JOA scale), operative time, blood loss, and complications.

Main Results:

  • Anterior approaches were preferred for Grade 3/4 or Zone A OPLL; Grade 2 or Zone B lesions allowed selective ossification resection.
  • Laminectomy was contraindicated for Grade 4 OPLL, and lesions near the arc vertex necessitated anterior approaches.
  • Patients managed per the classification system showed excellent and uniform Japanese Orthopedic Association (JOA) score improvements across all grades/zones.

Conclusions:

  • The novel thoracic OPLL classification system offers reliable and reproducible standardization for surgical decision-making.
  • Clinical outcomes and complication analyses support its validity in selecting appropriate decompression methods for thoracic OPLL.