Flail chest is defined as: (A) Fracture of 3 or more ribs at 2 or more places, (B) Fracture of 2 or more ribs at 2 or more places, (C) Fracture of 2 or more ribs at one place, (D) Fracture of multiple ribs at one place
Answer is B. Flail chest : Fracture of two or more consecutive ribs, with each rib having two or more fracture sites. Such segment is called flail segment. Ref : SRB&;s 4thE pg:1196