Extensor Tendon Lacerations to the Foot

A young man is brought into an emergency department after an electric lawn edger cut through his work boot and into the dorsum of his right foot. He has a clearly contaminated 5 cm x 1 cm laceration on the lateral side, and an underlying tendon is exposed. Sensation is diminished around the wound and he is unable to actively extend his 5th toe past a neutral position. How would you diagnose and repair his extensor tendon injury?

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