Conversation so far:
Who did Jackson play for in 80-81?
As he entered the last year of his Yankee contract in 1981.
What happened during that last year with the Yankees?
Jackson endured several difficulties from George Steinbrenner.
What kind of difficulties?
Jackson expected Steinbrenner to work out a new contract for him as well.
Steinbrenner never did.
Did Steinbrenner and Jackson butt heads about anything else?
when the 1981 Major League Baseball strike began, Steinbrenner invoked a clause in Jackson's contract forcing him to take a complete physical examination.

Question: What was the result of that physical examination?
Self-contained rewrite: What was the result of that physical examination on Jackson?