Annemieke Van Haver1, Steven Heylen2, Kristien Vuylsteke3, Geert Declercq2, Olivier Verborgt2. 1. Monica Orthopaedic Research Institute (MORE Institute), Antwerp, Belgium; Department of Electrical Energy, Systems and Automation, Ghent University, Ghent, Belgium. Electronic address: annemieke.vanhaver@ugent.be. 2. Department of Orthopedic Surgery, AZ Monica, Antwerp, Belgium. 3. Monica Orthopaedic Research Institute (MORE Institute), Antwerp, Belgium.
Abstract
BACKGROUND: Only a few articles describe the reproducibility and clinical feasibility of glenoid inclination measurements on conventional radiographs, and none of them validated their method in shoulder arthroplasty cases. From a clinical point of view, the angle measured between the supraspinatus fossa and the glenoid fossa line (angle β) appears to be the most interesting angle to assess glenoid inclination. This study aimed to validate the angle β in shoulder arthroplasty patients to facilitate the assessment of glenoid component inclination. MATERIALS AND METHODS: Seventeen patients who underwent total or reverse shoulder arthroplasty were evaluated. The angle β was measured by 2 independent observers on postoperative radiographs and 3-dimensional (3D) models. The interobserver variability and accuracy of angle β were analyzed by calculating the intraclass correlation coefficient (ICC) and by generating Bland-Altman plots. RESULTS: The angle β showed a good interobserver variability (ICC = 0.971 for radiographs, ICC = 0.980 for 3D models) and a good agreement between the radiographic and 3D measurements (ICC = 0.904 for observer 1 and ICC = 0.908 for observer 2). Bland-Altman plots demonstrated that in 95% of the measurements on radiographs, the error will be <10. In the investigated population, 85% showed an error <6. CONCLUSION: This study demonstrates that angle β can be measured on radiographs to assess glenoid component inclination in total and reverse shoulder arthroplasty, but clinicians and researchers should keep in mind that measurement errors of 10° may occur in a minority of cases.
BACKGROUND: Only a few articles describe the reproducibility and clinical feasibility of glenoid inclination measurements on conventional radiographs, and none of them validated their method in shoulder arthroplasty cases. From a clinical point of view, the angle measured between the supraspinatus fossa and the glenoid fossa line (angle β) appears to be the most interesting angle to assess glenoid inclination. This study aimed to validate the angle β in shoulder arthroplasty patients to facilitate the assessment of glenoid component inclination. MATERIALS AND METHODS: Seventeen patients who underwent total or reverse shoulder arthroplasty were evaluated. The angle β was measured by 2 independent observers on postoperative radiographs and 3-dimensional (3D) models. The interobserver variability and accuracy of angle β were analyzed by calculating the intraclass correlation coefficient (ICC) and by generating Bland-Altman plots. RESULTS: The angle β showed a good interobserver variability (ICC = 0.971 for radiographs, ICC = 0.980 for 3D models) and a good agreement between the radiographic and 3D measurements (ICC = 0.904 for observer 1 and ICC = 0.908 for observer 2). Bland-Altman plots demonstrated that in 95% of the measurements on radiographs, the error will be <10. In the investigated population, 85% showed an error <6. CONCLUSION: This study demonstrates that angle β can be measured on radiographs to assess glenoid component inclination in total and reverse shoulder arthroplasty, but clinicians and researchers should keep in mind that measurement errors of 10° may occur in a minority of cases.
Authors: Robert Z Tashjian; Brook I Martin; Cassandra A Ricketts; Heath B Henninger; Erin K Granger; Peter N Chalmers Journal: Clin Orthop Relat Res Date: 2018-08 Impact factor: 4.176
Authors: Alexandre Almeida; Daniel C Agostini; Pietro Ft Nesello; Nayvaldo C de Almeida; Rafael Mioso; Ana Paula Agostini Journal: J Shoulder Elb Arthroplast Date: 2021-02-15
Authors: Peter N Chalmers; Anthony A Romeo; Gregory P Nicholson; Pascal Boileau; Jay D Keener; James M Gregory; Dane H Salazar; Robert Z Tashjian Journal: Clin Orthop Relat Res Date: 2019-02 Impact factor: 4.176
Authors: Peter N Chalmers; Thomas Suter; Matthijs Jacxsens; Yue Zhang; Chong Zhang; Robert Z Tashjian; Heath B Henninger Journal: J Shoulder Elb Arthroplast Date: 2019-06-06