Shifting Perspectives in Shoulder Instability: The Emerging Role of the Coronal Glenoid Tilt Angle and 3D Assessment.

Abstract

Anterior glenohumeral instability is a multifactorial condition heavily influenced by the baseline bony architecture of the shoulder joint. Historically, surgical stratification has relied on defect-based models, prioritizing the measurement of acquired volumetric bone loss. However, recent literature underscores the critical role of inborn congenital morphology. This commentary contextualizes the recent study by Sundar et al., which introduces the Coronal Glenoid Tilt Angle (GTA) as a novel, independent risk factor for instability measured via 3D-CT. We highlight the clinical bottleneck that exists between advanced 3D spatial profiling and our current surgical algorithms. Ultimately, we advocate for the development of a comprehensive, multidomain instability score that synthesizes a patient's clinical profile, acquired volumetric defects, and intrinsic congenital restraints to better guide personalized interventions, ranging from isolated arthroscopic soft-tissue repairs to robust bone-block stabilizations.