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Illustration of (A) bridging callus on both cortices, (B) non-bridging callus on both cortices, and (C) our intermediate form “M” for Maybe on the upper cortices, where callus extends beyond a virtual line drawn between proximal and distal cortices and callus envelopes the exposed cortices, but the callus is not bridging, and non-bridging callus on the lower cortices.
