Dr. Armstrong took an interest in orthopedic surgery and sports medicine after sustaining a rotator cuff injury in high school. He graduated from Wilkes University in Wilkes-Barre, Pa., and from medical school in New Jersey. He then completed an orthopedic residency at Cooper University Health Care in Camden, N.J.
He went on to work as a surgeon in Clarion, Pa., performing countless operations throughout his career, according to the obituary.