Flail Chest is the instability of the chest wall due to multiple rib fractures sustained by considerable force. Two or more ribs are fractured at two different places on each rib, leaving a rib section that isn’t connected at either end. Broken segment moves opposite normal. Pulls inward with inspiration. The clinical assessments of Flail Chest are provided in the below infographic for your review.
Flail chest or segment occurs when three or more contiguous ribs are fractured in two or more places. Clinically, a segment of only one or two ribs can act as a flail segment, hence there is some controversy between the clinical and radiological definitions. Clinically, this is observed in a non-ventilated patient as paradoxical movement of the flail segment. It can often be clinically occult. http://radiopaedia.org/articles/flail-chest