Final answer:
Dr. Samuel A. Mudd helped fix John Wilkes Booth's damaged ankle.
Step-by-step explanation:
In the case of John Wilkes Booth's damaged ankle, the doctor who helped fix it was Dr. Samuel A. Mudd. After Booth assassinated President Abraham Lincoln, he injured his ankle while trying to escape. He sought medical treatment from Dr. Mudd, who set his broken leg and provided him with crutches.