Glenoid-version-measurement methods on magnetic resonance imaging: accuracy and reliability analysis.

Area of Science:

• Orthopedics
• Radiology
• Medical Imaging

Background:

• Glenoid version measurement methods were developed for computed tomography (CT) but are increasingly used with magnetic resonance imaging (MRI).
• The accuracy and reliability of these methods on MRI require thorough investigation.

Purpose of the Study:

• To determine the accuracy of established glenoid version measurement methods on MRI.
• To compare the reliability of these methods on MRI.
• To hypothesize that MRI can provide accurate glenoid version measurements comparable to CT.

Main Methods:

• Glenoid version was measured in 40 patients with glenohumeral instability using Friedman, Poon and Ting, and Matsumura methods on MRI.
• MRI measurements were compared to 3D corrected CT scans for accuracy assessment.
• Interobserver and intraobserver reliability were assessed by two independent observers.

Main Results:

• All three methods demonstrated favorable accuracy when compared to CT scans.
• The Friedman and Matsumura methods showed good interobserver reliability (ICC=0.78 and 0.89, respectively).
• The Matsumura method exhibited excellent intraobserver reliability (Observer 1 ICC=0.96, Observer 2 ICC=0.86).

Conclusions:

• All three glenoid version measurement methods are accurate and reliable for use with MRI, comparable to CT.
• The Friedman and Matsumura methods offer superior interobserver and intraobserver reliability for MRI-based glenoid version assessment.