A chronology of Sidney Crosby's battle to become healthy:
Jan. 1 – Crosby collides with then-Washington Capital David Steckel in the NHL Winter Classic at Heinz Field at the end of the second period. Crosby returns and plays the third period.
Jan. 5 – Crosby's head is hit into the glass on a hit from behind by Victor Hedman of Tampa Bay. Crosby finishes the game.
Jan. 6 – Head coach Dan Bylsma announces in Montreal that Crosby left the team to visit a doctor in Pittsburgh. After playing the Canadiens he tells the media Crosby suffered a concussion.
Jan. 29 – Crosby is cleared for off-ice workouts.
March 14 – Crosby skates for the first time since suffering the concussion.
March 31 – Crosby skates with his teammates for the first time in Sunrise, Fla.
April 17 – Crosby stops practising and all on-ice activity for remainder of the 2010-11 season.
June 2 – Crosby is cleared to begin his normal summer workout routine.
July 15 – Crosby resumes on-ice workouts.
August 24 – Crosby experiences concussion symptoms upon reaching 90-per-cent exertion. Visits with concussion specialists in Georgia and Michigan. They expect him to make a full recovery.
Sept. 7 – Crosby holds media conference with GM Ray Shero and doctors Michael Collins and Ted Carrick. Dr. Collins says Crosby will have "a long, fruitful NHL career."
Sept 17 – Crosby, wearing a white "no contact" helmet, opens training camp with his teammates. He receives a standing ovation from the crowd at CONSOL Energy Center.
Oct. 13 – Crosby is cleared for full contact.
Nov. 20 – Pens announce that Crosby will return to the lineup on Nov. 21 against the NY Islanders.