The construction of a one-bone forearm by cross-union of the proximal part of the ulna and the distal end of the radius should be considered when instability and extensive
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loss of the distal part of the ulna or the proximal part of the radius are present. The procedure is indicated only if the instability and bone loss are irreparable by bone-grafting or other reconstructive procedures and there is no chance of restoring rotation of the forearm.