Anatomically based radiological classification of thumb basal joint arthritis

Area of Science:

• Orthopedics
• Radiology
• Surgical Treatment

Background:

• Thumb basal joint arthritis is prevalent and treated with numerous surgical techniques.
• Existing radiological classifications have limitations in guiding treatment decisions.
• Anatomically based radiological evaluation is crucial for effective treatment.

Purpose of the Study:

• To propose a new radiological classification system for thumb basal joint arthritis.
• To define parameters for assessing joint space narrowing, instability, and scaphotrapeziotrapezoid damage.
• To address the shortcomings of current classification systems like Dell and Eaton-Littler.

Main Methods:

• Definition of three key radiological parameters: Trapeziometacarpal (TM) joint space narrowing (TMA), TM instability and subluxation (TMI), and scaphotrapeziotrapezoid (STT) damage.
• Development of a four-stage grading system for each parameter (TMA0-3, TMI 0-3, STT 0-3).
• Evaluation of the proposed parameters against existing classifications.

Main Results:

• The proposed classification provides detailed staging for TMA, TMI, and STT damage.
• Specific criteria are outlined for each stage, enabling precise radiological assessment.
• The system aims to offer a more anatomically based approach compared to existing methods.

Conclusions:

• The proposed radiological classification offers a standardized framework for evaluating thumb basal joint arthritis.
• Further prospective studies are needed to validate and standardize surgical treatment modalities based on this classification.
• Accurate radiological assessment is essential for selecting appropriate surgical interventions.