Conversation so far:
Did anything happen significant in the 1979 series?
Dierforf sustained torn ligaments in his left knee during an extra point attempt.
Who did he play for during these seasons?
against the New York Giants.
He was against the Giants?
Who did he play for?
Cardinals.
Did he ever get hurt during these seasons?
underwent knee surgery, and missed the remainder of the 1979 season.

Question: Did this end his career during this time?
Self-contained rewrite: Did the knee surgery end Dan Dierdorf's career during 1979?