shows examples of radiographs that would be attributed different RUSHU scores. A score of 1 for no evidence of callus, 2 for some callus and 3 for bridging callus is attributed to each cortex. 2a & b suggest bridging callus, each cortex scores 3. 2c & d show some callus, but not obviously bridging, each cortex scores 2. 2e & f do not show convincing evidence of callus, each cortex scores 1.