The Ellipse modification of the Friedman method for measuring glenoid version. (February 2020)

• Record Type: Journal Article
• Authors: Javed, Saqib; Hadi, Saif; Imam, Mohamed A.; Gerogiannis, Dimitris; Foden, Philip; Monga, Puneet
• Is Part Of: Bone & joint journal. Volume 102B:Number 2(2020)
• Page Start: 232
• Page End: 238
• Publication Date: 2020-02
• Subjects: Ellipse -- Friedman -- Method -- Glenoid -- Version -- Shoulder Arthroplasty; Bones -- Surgery -- Periodicals; Joints -- Surgery -- Periodicals; Orthopedic surgery -- Periodicals; 617.47005
• DOI: 10.1302/0301-620X.102B2.BJJ-2019-0726.R1
• Languages: English
• ISSNs: 2049-4394

Abstract

Abstract : Aims: Accurate measurement of the glenoid version is important in performing total shoulder arthroplasty (TSA). Our aim was to evaluate the Ellipse method, which involves formally defining the vertical mid-point of the glenoid prior to measuring the glenoid version and comparing it with the 'classic' Friedman method. Methods: This was a retrospective study which evaluated 100 CT scans for patients who underwent a primary TSA. The glenoid version was measured using the Friedman and Ellipse methods by two senior observers. Statistical analyses were performed using the paired t -test for significance and the Bland-Altman plot for agreement. Results: The mean glenoid version was -3.11° (-23.8° to 17.9°) using the Friedman method and -1.95° (-29.8° to 24.6°) using the Ellipse method (p = 0.002). In 16 patients the difference between methods was greater than 5°, which we considered to be clinically significant. There was poor agreement between methods with relatively large 95% limits of agreement. There was excellent inter-rater agreement between the observers for the Ellipse method and similarly, the intrarater agreement was excellent with a repeatability coefficient of 0.94. Conclusion: We recommend the use of the Ellipse modification to define the mid glenoid point prior to measuring the glenoid version in patients undergoing TSA. Cite this article: Bone Joint J 2020;102-B(2):232–238.