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Forschungsdatenbank PMU-SQQUID

The medial-ridge sign as an indicator of anterior glenoid bone loss.
Moroder, P; Tauber, M; Hoffelner, T; Ernstbrunner, L; Sattler, C; Auffarth, A; Resch, H;
J Shoulder Elbow Surg. 2013; 22(10):1332-1337
Originalarbeiten (Zeitschrift)


Auffarth Alexander
Ernstbrunner Lukas
Hoffelner Thomas
Moroder Philipp
Resch Herbert
Sattler Christoph
Tauber Mark


The goal of this study was to investigate the incidence of a medial bony ridge at the scapular neck in patients with recurrent anterior shoulder instability and analyze its reliability in identifying anterior glenoid rim bone loss.
A total of 109 shoulders in 105 consecutive patients underwent primary surgical stabilization for recurrent anterior shoulder instability with preoperative 2-dimensional and 3-dimensional computed tomography (CT) evaluation. The CT images of each affected shoulder were analyzed for the extent of anterior glenoid bone loss and the presence of a "medial-ridge sign." The sensitivity, specificity, positive predictive value (PPV), and negative predictive value (NPV) of the medial-ridge sign were calculated for different sizes of glenoid rim defects.
A positive medial-ridge sign was detected in 77.1% of the shoulders. The sensitivity of the medial-ridge sign ranged from 81.6% (95% confidence interval [CI], 73.0%-87.9%) for defects greater than 0% to 100% (95% CI, 82.4%-100%) for defects ≥20%. The PPV of the medial-ridge sign decreased from 100% for defects >0% to 11.9% for defects ≥25%. The specificity of the medial-ridge sign decreased from 100% (95% CI, 61.0-100%) for defects >0%, to 25.3% (95% CI, 17.7%-34.6%) for defects ≥25%. The NPV of the medial-ridge sign increased from 24.0% for defects >0% to 100% for defects >20%.
The medial-ridge sign represents a CT-based radiologic sign with high sensitivity and NPV for identification of significant anterior glenoid rim defects in case of recurrent anterior shoulder instability.

Useful keywords (using NLM MeSH Indexing)


Bone Resorption/complications

Bone Resorption/radiography*

Diagnosis, Differential


Follow-Up Studies



Imaging, Three-Dimensional

Joint Instability/etiology*

Joint Instability/radiography


Retrospective Studies

Severity of Illness Index

Shoulder Joint/radiography*

Tomography, X-Ray Computed/methods*

Find related publications in this database (Keywords)

Glenoid bone loss
shoulder instability
medial-ridge sign
glenoid defect
shoulder dislocation