Radiographic differences exist between children with separate and shared epiphyses. In patients with shared epiphyses, the radial thumb tends to be smaller, closer to the ulnar thumb, and less divergent. Threshold values were identified for predicting the status of the epiphysis based on the angle × interspace distance and the angle × interspace index. These values may be used to help determine in advance of surgery if a shared epiphysis exists.
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