Page 54 - Imaging of Osteoarthritis and Rheumatoid Arthritis in Hand Joints
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                                Chapter 3
STT OA. Stage III was a JSN score of 2, an osteophyte score of 2, or a JSN or osteophyte score of 1 with additional cysts or erosions, and no STT OA. Eaton stage IV was defined as all cases that had CMC1 and STT OA.
Statistical data analysis was performed using SPSS version 19.0. Inter-rater reliability of radiography and CT was assessed using percentage agreement and intraclass correlation coefficients (ICC). The ICC was calculated as two-way random, single measures, absolute agreement.14
The images of 30 patients were scored and analyzed. Twenty-one of these patients were female, the median age was 57 years (interquartile range 53-61), and 21 right and 9 left hands were assessed.
All radiographic examinations consisted of a minimum of two views, including a PA view of the wrist and a lateral and/or oblique view of the wrist. Some radiographic examinations included additional stress views. All CT examinations consisted of axial scanned wrists with slices of 0.4-0.75 mm, and reconstructions in the coronal and sagittal direction. In one CT examination the STT joint was not depicted on the coronal and sagittal reconstructions. This STT joint was excluded from all analyses that included STT joints.
The inter-reader reliability of CT for the detection of CMC1 OA (ICC 1.00) and STT OA (ICC 0.80) was higher than that of radiography (ICCs 0.15 and 0.45) (Table 1). On the CT images, both readers agreed that there were 28 cases with CMC1 OA and two cases without CMC1 OA. With radiography, however, both readers agreed that there were 23 cases with CMC1 OA and one without CMC1 OA. Disagreement in the six radiographical cases was caused three times by different judgements in osteophytes and three times by disagreement in both osteophytes and JSN. For the STT joint, both readers agreed on CT that there were 15 cases with STT OA and eleven cases without STT OA. The disagreement in the remaining three cases was caused once by a different judgment in osteophytes, once by a difference in cyst presence, and once by a difference in osteophytes and cyst. With radiography, both readers agreed that there

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