Usefulness of the acromioclavicular joint cross-sectional area as a diagnostic image parameter of acromioclavicular osteoarthritis

Figure 1 Measurement of both the acromioclavicular joint space width (A) and acromioclavicular joint cross-sectional area (B) in the normal control group was carried out on coronal T2-weighted shoulder-MR acromioclavicular joint images.

Figure 2 In the acromioclavicular joint osteoarthritis group, both the acromioclavicular joint space width (A) and acromioclavicular joint cross-sectional area (B) were measured on coronal T2-weighted shoulder-MR images.

Figure 3 Receiver operating characteristic curve of both the acromioclavicular joint cross-sectional area and the acromioclavicular joint space width to detect acromioclavicular joint osteoarthritis. The most suitable acromioclavicular joint cross-sectional area cutoff point was 26.14 mm² vs 2.37 mm for the acromioclavicular joint space width, with 91.4% sensitivity vs 88.6%, and 90.0% specificity vs 96.7%, respectively.