What sort of disorder is a flail chest?

Flail chest: A flail chest occurs when the chest wall is injured in such a way that a portion isolated most commonly by multiple rib fratures will move paradoxically in comparision to the remaing chest wall. Thus when taking a deep breath the flail segment gets sucked inward (rather than expanding) or when forcibly breathing out the flail segment moves outward and expand in contrast to the rest of the chest.

Rib fractures: A flail chest occurs when several ribs adjacent to each other ate fractured and a segment of the chest wall are then able to move paradoxically. During inhalation, the fractured ribs are sucked inward and during exhalation, they move outward which is opposite of the normal rib movements