During certain heart surgeries, the sternum is opened and must then be closed securely. The study compares two closure methods - steel wires and SuperCable - in terms of stability, healing, and patient satisfaction. This investigation aims to demonstrate that the iso-elastic properties of the SuperCable Sternal Closure System result in faster sternal bone healing, reduced postoperative pain, shorter hospital stay, and improved physical recovery compared to conventional steel wire sternal closure. Eighty-six patients are participating and are randomly assigned to one of the two groups. After the operation, pain, healing, and possible complications are checked. The patients are examined 3 and 6 months after the operation.