2017 ISAKOS Biennial Congress ePoster #2024

 

Inter-Observer Variability of Glenoid Track Measurement Using Magnetic Resonance Imaging in Patients with Anterior Gleno-Humeral Instability

Max Ekdahl, MD, Santiago, RM CHILE
Sara Muñoz, MD, Santiago CHILE
Edith Miranda, MD, Santiago CHILE
Vicente Gutierrez, MD, Santiago CHILE
Miguel Pinedo, MD, Santiago, Region Metropolitana CHILE
Fernando Radice, MD, Santiago, RM CHILE
Francisco Muñoz, MD, Santiago CHILE
Joaquin Orizola, MD, Santiago CHILE

Clinica Las Condes, Santiago, Region Metropolitana, CHILE

FDA Status Not Applicable

Summary

Glenoid track measurement has a fair inter-observer agreement in magnetic resonance imaging in anterior gleno-humeral instability

Abstract

Background

the characterization of a Hill Sachs (HS) injury in relation to the Glenoid Track (GT) concept, as an Off track or On Track lesion, has implications in the surgical treatment of the anterior gleno-humeral instability. The information in the literature about the magnetic resonance imaging (MRI) variability in the measurement of the glenoid track is insufficient. The purpose of this study was to evaluate the inter-observer variability in the measurement of the HS injury (On track / Off track), using preoperative magnetic resonance images of patients with anterior gleno-humeral instability diagnosis.

Materials And Methods

Retrospective study using MRI of patients that underwent anterior gleno-humeral instability surgery between January 2011 and June 2016. We used the MRI measurement of the HS lesion and GT by two trained professionals (musculoskeletal radiologist) of our institution. Glenoid width, HS width and HS interval were measured. We used the Kappa index to evaluate the inter-observer variability.

Results

Forty-two patients were included. The kappa coefficient of inter-observer agreement was moderate for glenoid width measurement, moderate for HS width, poor for bone bridge measurement, moderate for HS interval measurement and fair for definition of On/Off track lesions.

Conclusion

The measurement of the HS injury and its relation to the GT is not completely reproducible. We recommend its use with caution in patients with anterior gleno-humeral instability.