Assessment of glenoid inclination on routine clinical radiographs and computed tomography examinations of the shoulder
| Autor: | Stephan H. Wirth, Bernhard Jost, Alexander Maurer, Ali Djahangiri, Christian W. A. Pfirrmann, Sandro F. Fucentese, Christian Gerber |
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| Přispěvatelé: | University of Zurich, Gerber, Christian |
| Rok vydání: | 2011 |
| Předmět: |
musculoskeletal diseases
Male medicine.medical_specialty Glenoid Cavity Rotation Radiography Computed tomography 610 Medicine & health Fracture group Cohort Studies 2732 Orthopedics and Sports Medicine Imaging Three-Dimensional Scapula Reference Values medicine Humans Orthopedics and Sports Medicine Range of Motion Articular Observer Variation medicine.diagnostic_test business.industry Shoulder Joint Reproducibility of Results General Medicine Models Theoretical musculoskeletal system Lateral margin 2746 Surgery Biomechanical Phenomena Neutral position Surgery 10046 Balgrist University Hospital Swiss Spinal Cord Injury Center Female Radiology Tomography Range of motion Nuclear medicine business Tomography X-Ray Computed |
| Zdroj: | Journal of shoulder and elbow surgery. 21(8) |
| ISSN: | 1532-6500 |
| Popis: | Background Accurate assessment of glenoid inclination is of interest for a variety of conditions and procedures. The purpose of this study was to develop an accurate and reproducible measurement for glenoid inclination on standardized anterior-posterior (AP) radiographs and on computed tomography (CT) images. Materials and methods Three consistently identifiable angles were defined: Angle α by line AB connecting the superior and inferior glenoid tubercle (glenoid fossa) and the line identifying the scapular spine; angle β by line AB and the floor of the supraspinatus fossa; angle γ by line AB and the lateral margin of the scapula. Experimental study: these 3 angles were measured in function of the scapular position to test their resistance to rotation. Conventional AP radiographs and CT scans were acquired in extension/flexion and internal/external rotation in a range up to ±40°. Clinical study: the inter-rater reliability of all angles was assessed on AP radiographs and CT scans of 60 patients (30 with proximal humeral fractures, 30 with osteoarthritis) by 2 independent observers. Results The experimental study showed that angle α and β have a resistance to rotation of up to ±20°. The deviation from neutral position was not more than ±10°. The results for the inter-rater reliability analyzed by Bland-Altman plots for the angle β fracture group were (mean ± standard deviation) −0.1 ± 4.2 for radiographs and −0.3 ± 3.3 for CT scans; and for the osteoarthritis group were −1.2 ± 3.8 for radiographs and −3.0 ± 3.6 for CT scans. Conclusion Angle β is the most reproducible measurement for glenoid inclination on conventional AP radiographs, providing a resistance to positional variability of the scapula and a good inter-rater reliability. |
| Databáze: | OpenAIRE |
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