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The role of 18 F-FDG PET/CT in the diagnosis of frozen shoulder
Knee Surgery, Sports Traumatology, Arthroscopy ( IF 3.149 ) Pub Date : 2020-03-13 , DOI: 10.1007/s00167-020-05937-2
Linus Daniel Leonhard Duchstein, Jens Rithamer Jakobsen, Line Marker, Mads Okholm, Lars Friberg, Lene Simonsen, Michael Rindom Krogsgaard

Abstract Purpose Frozen shoulder is characterized by pain and reduced passive movement capability, and the diagnose is made clinically. However, pain is the major symptom in the first stage before stiffness occurs, and the condition can be mistaken for subacromial impingement. This study explored the possibility to use positron emission tomography/computed tomography (PET/CT) with a 18F Flour-Deoxy-Glucose (FDG) tracer in the diagnostic process. Methods Eleven patients with frozen shoulder and 9 patients with subacromial impingement received a 18F-FDG PET/CT scan before being treated surgically. During arthroscopy, the diagnoses were confirmed. Images were blindly analyzed visually by two nuclear medicine physicians. Also, semi-quantified analysis applying a set of standard regions was performed, and standard uptake value in both shoulder regions was recorded. Results Both the visual description of the pictures and the semi-quantified analysis generally showed increased FDG uptake in the affected shoulder regions of patients that had frozen shoulder and no uptake in patients with subacromial impingement. Kappa for interobserver agreement in the visual assessments was 0.74. Sensitivity was 92% and specificity 93% of the visual assessment, 77% and 93%, respectively, of the semi-quantified analyses, and by combining the two types of analyses sensitivity was 100% and specificity was 93% for the distinction between frozen shoulders and subacromial impingement/unaffected shoulders. Conclusion 18F-FDG PET/CT seems to be a valid method to diagnose frozen shoulder. This is clinically relevant in diagnostically challenging cases, for instance in the first phase of frozen shoulder, which can be difficult to distinguish from subacromial impingement. Level of evidence II.
更新日期:2020-03-16

 

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