Sean Couturier is a professional ice hockey player who has suffered from a back injury that has caused him to miss a significant amount of playing time. Here are some details about his injury:

Positive:

• Couturier is healthy and has returned to playing after missing 135 games due to his back injury.

Negative:

• Couturier suffered a herniated disk in his back during pre-camp.
• Couturier underwent back revision surgery and is expected to miss three to four months.
• Couturier was unable to practice due to an undisclosed injury, raising doubts regarding his availability for a game.

Ingredients or materials:

• The articles do not provide information about the specific materials or ingredients related to Couturiers injury.