What holds the dacron tube in place after thoracic replacement surgery?

The Dacron graft is sutured to both ends of the remaining portion of the vessel. If Total thoracic aorta surgery is what is being referred to then, yes. Also on a side note: A lot of times the vessel is opened up, and the graft is placed inside the vessel then the vessel is sutured around the graft. The sutures penetrate the vessel and the graft. Dacron does not cause any postoperative immunization reactions, and over time, tissue grows around the graft.