ArticleCureus2025
Humeral Head Diameter-to-Glenoid Surface Area Ratio as a Morphometric Risk Factor for Posterior Labral Tears: A Retrospective Computed Tomography Analysis.
Article in Cureus, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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6 authors.
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Abstract
objectiveThis study aimed to evaluate whether the humeral head diameter-to-glenoid surface area ratio (HH/GA ratio) is associated with the presence of labral tears and to determine whether this morphometric parameter differs between anteroinferior (Bankart), superior labrum from anterior to posterior (SLAP), and posterior tear subgroups. MATERIALS AND
methodsA retrospective analysis of 240 shoulder computed tomography (CT) scans (2014-2024) was performed. The study group included 120 patients with labral tears, classified into anterior (Bankart + SLAP; n = 88) and posterior (n = 32) subgroups. The control group consisted of 120 age- and sex-matched individuals without pathological findings. The HH/GA ratio (mm⁻¹ × 10³) was calculated by dividing humeral head diameter by glenoid surface area. All measurements were performed by two independent observers with excellent interobserver reliability (ICC = 0.91).
resultsThe scaled HH/GA ratio (× 10³ mm⁻¹) was significantly higher in the labral tear group compared with controls (50.6 ± 3.3 vs. 48.6 ± 3.7; p < 0.001). Posterior tears demonstrated the highest ratios (52.8 ± 3.1; p < 0.001 vs. controls), whereas anterior tears did not significantly differ from controls (49.8 ± 3.0; p = 0.109). For predicting posterior labral tears, receiver operating characteristic (ROC) analysis showed an area under the curve (AUC) of 0.808, with an optimal cutoff of 49.8 × 10³ mm⁻¹ (corresponding to 0.0498 mm⁻¹), yielding 84.2% sensitivity and 66.7% specificity.
conclusionThe HH/GA ratio is moderately but significantly associated with posterior labral tears and may reflect an underlying morphometric predisposition. While not diagnostic on its own, it may serve as an adjunctive quantitative parameter during the evaluation of patients at risk for posterior shoulder instability. Larger prospective studies are needed for external validation.
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