The sternum isn't attached to any intercostal muscles, it's connected to intercostal cartilage.
It's very uncommon for total sternal dislocation, as it would require severe trauma, probably resulting in death!
It's quite common for the xiphoid process to get detached and dislocated, as it's unossified before the age of 25-30. Manubriosternal luxations are also quite common, as the ossification can be weak between the 1st and 2nd sternebra.
Gladiosternal luxations are rare, as with a total sternal luxation, it would most likely kill you.
There. So now we know
