Reliability of a Novel Classification System for Thoracic Disc Herniations

Area of Science:

• Spine surgery
• Radiology
• Orthopedics

Background:

• Thoracic disc herniations (TDHs) are complex spinal lesions with significant variability.
• A lack of standardized classification systems hinders consistent description and management of TDHs.
• Existing systems do not comprehensively address the diverse characteristics of TDHs.

Purpose of the Study:

• To assess the reliability of a novel classification system for thoracic disc herniations (TDHs).
• To establish a standardized method for categorizing TDHs based on anatomical and clinical features.
• To evaluate surgeon consensus on management strategies for different TDH classifications.

Main Methods:

• A cross-sectional survey was conducted among 21 experienced US spine surgeons.
• A proposed 5-type classification system for TDHs, including subtypes for calcification, was presented.
• Surgeons rated illustrative cases and provided input on surgical approaches for each TDH type, with reliability assessed using Fleiss kappa coefficients.

Main Results:

• The proposed TDH classification system achieved high overall agreement (80%) and substantial interobserver (kappa=0.604) and intraobserver (kappa=0.630) reliability.
• Consensus was reached on nonoperative management for Type 0 TDHs (no significant effacement).
• Surgical approach preferences varied by TDH type, with posterior approaches favored for Type 1 and anterolateral for Types 3 and 4.

Conclusions:

• The novel TDH classification system is reliable for categorizing these spinal lesions.
• Standardized classification can improve descriptive accuracy and potentially guide surgical decision-making.
• Further validation of the system concerning treatment outcomes is warranted.