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Important aspects of this case include: (1) using nerve autografts (the undisputed gold standard) for bridging gaps in critical nerves such as the ulnar nerve; (2) mapping out the motor and sensory topography of the injured nerve prior to grafting to ensure grafting of proximal sensory components to distal sensory components and proximal motor components to distal motor components; and (3) reconstructing the donor nerve (MABC) by transferring its distal stump to the side of an intact sensory nerve.