joe alderete. >> dr. alderete: i was so proud of alex-- sorry-- and-- and all that he had achieved. >> o'donnell: you were emotional then watching that. >> dr. alderete: i was, i was totally blown away. i didn't know whether i w-- i wanted to cheer or throw up. it scared me to death, but i-- i just loved watching alex achieve. >> up tall, there we go. >> o'donnell: dr. alderete says the only other patients he's seen achieve similar outcomes are the most elite u.s. special forces. >> o'donnell: so you've worked with almost 1,000 limb salvage patients. how many have been able to get back to the type of functionality that alex smith has? >> dr. alderete: less than a dozen. alex is my capstone patient of somebody who absolutely knocked it out of the park. >> o'donnell: smith went on to record a five and one record as a starter. washington beat archrivals the cowboys on thanksgiving day and in their next game, ruined the steelers' undefeated season. >> i want to resist from your heel. okay, ready? >> o'donnell