Trauma-instability-voluntarism classification for glenohumeral instability

Area of Science:

• Orthopedics
• Sports Medicine
• Biomechanics

Background:

• Glenohumeral instability classification is complex due to multiple contributing factors.
• Existing systems lack clarity, hindering research and clinical application.
• A simplified, comprehensive classification is needed for effective management.

Purpose of the Study:

• To develop and validate a novel classification system for glenohumeral instability.
• To simplify the categorization of shoulder instability based on key etiological factors.
• To introduce a standardized nomenclature for describing glenohumeral joint conditions.

Main Methods:

• Retrospective analysis of 189 patients (207 joints) with glenohumeral instability.
• Development of a new classification based on trauma level, instability direction, and voluntarism.
• Utilized abbreviations for concise joint condition reporting.

Main Results:

• The new classification, incorporating trauma, direction, and voluntarism, effectively simplified glenohumeral instability categorization.
• Approximately 50% of patients experienced no or mild trauma.
• Two-thirds of joints with recurrent instability exhibited multi-directional or additional instability patterns.

Conclusions:

• The proposed classification system offers a practical and simplified approach to glenohumeral instability.
• This new system facilitates more accurate comparisons of pathogenetic mechanisms and treatment outcomes.
• Standardized classification is crucial for advancing research and clinical practice in shoulder instability.