From Don Sweeney, per the Bruins’ website:
"David Backes underwent the removal of the olecranon bursa from his elbow on Monday, October 24. His condition will be updated after the weekend."
It appears Backes’ injury is some serious swelling around the elbow, which obviously required surgery. The American Society for Surgery of the Hand says the injury can come from elbow trauma, so it makes sense a hockey player would have such an injury.
Sweeney says he’ll update Backes’ condition after this weekend, but this, from the American Academy of Orthopedic Surgeons, isn’t ideal (emphasis mine):
Recovery. Your doctor will apply a splint to your arm after the procedure to protect your skin. In most cases, casts or prolonged immobilization are not necessary.
Although formal physical therapy after surgery is not usually needed, your doctor will recommend specific exercises to improve your range of motion. These are typically permitted within a few days of the surgery.
Your skin should be well healed within 10 to 14 days after the surgery, and after 3 to 4 weeks, your doctor may allow you to fully use your elbow. Your elbow may need to be padded or protected for several months to prevent reinjury.
To fill in the roster spot, Austin Czarnik was recalled from Providence. Expect him to slot in somewhere at some point (insight!) and for Claude to continue to wield the Healthy Scratch Hammer.