The Blues said Scandella injured the hip in late August while training for the upcoming season. He's scheduled to be re-evaluated in six months.
Scandella, 32, appeared in 70 games last season and averaged 18:08 in ice time per game. He had three goals and 11 assists, playing to a plus-17. He's appeared in 699 career NHL games with the Blues, Montreal Canadiens, Buffalo Sabres and Minnesota Wild.
Scandella played the majority of his time skating on a pairing with Colton Parayko last season. He was in and out of the lineup in the Stanley Cup playoffs due to a lower body injury.
The veteran defenseman has two years left on his contract with a $3.275 million average annual salary, which can be moved to long-term injured reserve.