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Fig. 8. —Bar graph shows sensitivity (black), specificity (gray), and accuracy (white) achieved by three observers using composite criteria (score of 3 for either "absent middle facet" sign or C sign) and individual criteria at different thresholds for positive diagnosis of subtalar middle facet coalition. Note highest accuracy was achieved when score of 3 for either absent middle facet sign or C sign was considered positive for subtalar middle facet coalition. AMF = absent middle facet sign, TB = "talar beak" sign.