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Table 1 Definitions of the hierarchical grouping of radiological features from the radiologists' reports

From: A cross sectional study of requests for knee radiographs from primary care

Group Definition Description
Group 1 Definition The term 'osteoarthritis' or 'OA' is used.
Group 2 Definition Those in group 1 plus those with the term 'degenerative disease'.
Group 3 Definition Those in groups 1 and 2 plus those with any mention of specific radiographic features of osteoarthritis i.e. joint space narrowing, osteophytes, lipping, sclerosis or articular surface changes.