Conversation so far:
Why did Roger Clemens return to the Yankees?
Roger Clemens unexpectedly appeared in the owner's box at Yankee Stadium on May 6, 2007, during the seventh-inning stretch of a game against the Seattle Mariners.
Why did Roger Clemens appear unexpectedly in the owner's box at Yankee Stadium on May 6, 2007, during the seventh-inning stretch of a game against the Seattle Mariners?
Roger Clemens unexpectedly appeared in the owner's box at Yankee Stadium on May 6, 2007 and made a brief statement.
What was Clemens's statement when he unexpectedly appeared in the owner's box at Yankee Stadium on May 6, 2007, during the seventh-inning stretch of a game against the Seattle Mariners?
Roger Clemens: Thank y'all. Well they came and got me out of Texas, and uhh, I can tell you it's a privilege to be back. I'll be talkin' to y'all soon.“
Did Roger Clemens do anything of recognition for the New York Yankees?
On June 21, with a single in the 5th inning against the Colorado Rockies, Roger Clemens became the oldest New York Yankee to record a hit (44 years, 321 days).
Did Roger Clemens lose any games for the New York Yankees after he returned in 2007?
Roger Clemens finished the 2007 regular season with a record of 6–6 and a 4.18 ERA.
Did Roger Clemens receive any awards for his time playing with the Yankees in the 2007 season?
On July 2, Roger Clemens collected his 350th win against the Minnesota Twins at Yankee Stadium. Clemens is one of three pitchers in the live-ball era to accomplish this.
Does Roger Clemens still play for the Yankees?
Yankees manager Joe Torre removed Roger Clemens from the roster due to his injury, and replaced him with left-hander Ron Villone.

Question: What was his injury?
Self-contained rewrite: What was Roger Clemens's injury that removed him from the Yankees's roster in 2007?