The incident occurred midway during the first quarter, with Bartel crunched by teammate James Podsiadly in a marking contest on the wing.
Bartel was assisted by trainers off the ground and immediately headed down to the rooms before being ruled out at the quarter-time break.
He was replaced by substitute Mitch Duncan as the Saints held a slender three-point lead at the first change.
The Cats hit back in the second term booting several unanswered goals to take a commanding lead into the long break.
Later in third term, former Cat Ryan Gamble lit up the Melbourne skies with a towering mark.
With Nick Riewoldt and Tom Lonergan locking horns, Gamble climbed on his former teammate Darren Milburn's shoulders to take a sensational grab deep in the Saints forward-line.
Gamble kicked truly to reduce the margin to just two goals, after the Cats had a 23-point lead at the main break.
