Flail chest

Flail chest
A 3D reconstruction from a CT scan showing a flail chest. Arrows mark the rib fractures.
Classification and external resources
Specialty emergency medicine
ICD-10 S22.5
ICD-9-CM 807.4
DiseasesDB 32227
eMedicine med/2813
MeSH D005409

Flail chest is a life-threatening medical condition that occurs when a segment of the rib cage breaks due to trauma and becomes detached from the rest of the chest wall. Two of the symptoms of flail chest are chest pain and shortness of breath.[1]

It occurs when multiple adjacent ribs are broken in multiple places, separating a segment, so a part of the chest wall moves independently. The number of ribs that must be broken varies by differing definitions: some sources say at least two adjacent ribs are broken in at least two places,[2] some require three or more ribs in two or more places.[3] The flail segment moves in the opposite direction to the rest of the chest wall: because of the ambient pressure in comparison to the pressure inside the lungs, it goes in while the rest of the chest is moving out, and vice versa. This so-called "paradoxical breathing"[4] is painful and increases the work involved in breathing.

Flail chest is usually accompanied by a pulmonary contusion, a bruise of the lung tissue that can interfere with blood oxygenation.[5] Often, it is the contusion, not the flail segment, that is the main cause of respiratory problems in people with both injuries.[6]

Surgery to fix the fractures appears to result in better outcomes.[7]

Signs and symptoms

Diagrams depicting the paradoxical motion observed during respiration with a flail segment

Two of the symptoms of flail chest are chest pain and shortness of breath.[1]

The characteristic paradoxical motion of the flail segment occurs due to pressure changes associated with respiration that the rib cage normally resists:

The constant motion of the ribs in the flail segment at the site of the fracture is extremely painful, and, untreated, the sharp broken edges of the ribs are likely to eventually puncture the pleural sac and lung, possibly causing a pneumothorax. The concern about "mediastinal flutter" (the shift of the mediastinum with paradoxical diaphragm movement) does not appear to be merited.[8] Pulmonary contusions are commonly associated with flail chest and that can lead to respiratory failure. This is due to the paradoxical motions of the chest wall from the fragments interrupting normal breathing and chest movement. Typical paradoxical motion is associated with stiff lungs, which requires extra work for normal breathing, and increased lung resistance, which makes air flow difficult.[9] The respiratory failure from the flail chest requires mechanical ventilation and a longer stay in an intensive care unit.[10] It is the damage to the lungs from the flail segments that are life-threatening.


The most common reason for flail chest injuries are vehicle collisions, which account for 76% of flail chest injuries.[11] Another main cause of flail chest injuries results from falling which is mainly elderly related. The elderly are more impacted by the falls as a result of their weak and frail bones, unlike their younger counterparts who can fall without being impacted as severely. Falls account for 14% of flail chest injuries.[1]

This typically occurs when three or more adjacent ribs are fractured in two or more places, allowing that segment of the thoracic wall to displace and move independently of the rest of the chest wall. Flail chest can also occur when ribs are fractured proximally in conjunction with disarticulation of costal cartilages distally. For the condition to occur, generally there must be a significant force applied over a large surface of the thorax to create the multiple anterior and posterior rib fractures. Rollover and crushing injuries most commonly break ribs at only one point– for flail chest to occur a significant impact is required, breaking the ribs in two or more places.[12] This can be caused by a significant fall, car accident or other forceful accidents. In the elderly, it can be caused by deterioration of bone, although rare. In children, the majority of flail chest injuries can be a result of the common blunt force traumas or metabolic bone diseases, one known as osteogenesis imperfecta.[13]


A chest radiograph of a flail chest associated with right sided pulmonary contusion and subcutaneous emphysema

Diagnosis is by medical imaging with either plain X ray or CT scan.


Mobilization of the chest and pectoral muscle stretch. During inspiration, the person will clasp hands behind the head and will horizontally abduct the arms.
During exhalation, the person will bend forward bringing the elbows together.

Treatment of the flail chest initially follows the principles of advanced trauma life support. Further treatment includes:

Surgical fixation can help in significantly reducing the duration of ventilatory support and in conserving the pulmonary function.[14]

A person may be intubated with a double lumen tracheal tube. In a double lumen endotracheal tube, each lumen may be connected to a different ventilator. Usually one side of the chest is affected more than the other, so each lung may require drastically different pressures and flows to adequately ventilate.


In order to begin a rehabilitation program for a flail chest it is important to treat the person's pain so they are able to perform the proper exercises. Due the underlying conditions that the flail segment has caused onto the respiratory system, chest physiotherapy is important to reduce further complications. Proper positioning of the body is key, including postural alignment for proper drainage of mucous secretions.[15] The therapy will consist of a variety of postural positioning and changes in order to increase normal breathing. Along with postural repositioning, a variety of breathing exercises are also very important in order to allow the chest wall to reposition itself back to normal conditions. Breathing exercises will also include coughing procedures.[15] Furthermore, range of motion exercises are given to reduce the atrophy of the musculature.[16] With progression, resistance exercises are added to the regimen to the shoulder and arm of the side containing the injury. Moreover, trunk exercises will be introduced while sitting and will progress to during standing.[17] Hip flexion exercises can be done to expand the thorax. This is done by lying supine on a flat surface, flexing the knees and hips and bringing them in toward the chest. The knees should come in toward the chest while the person inhales, and exhale when the knees are lowered.[17] This exercise can be done in 3 sets of 6-8 repetitions with a pause in between sets. The person should always make sure to maintain controlled breaths.[17]

Eventually, the person will be progressed to walking and posture correction while walking.[17] Before, the person is discharged from the hospital the person should be able to perform mobility exercises to the core and should have attained good posture.


The death rate of people with flail chest depends on the severity of their condition, ranging from 10 to 25%.[1]


Approximately 1 out of 13 people admitted to the hospital with fractured ribs are found to have flail chest.[18]


  1. 1 2 3 4 Athanassiadi, Kalliopi, Michalis Gerzounis, Nikolaos Theakos. Management of 150 flail chest injuries: analysis of risk factors affecting outcome. European Journal of Cardio-thoracic surgery 26. (2004). Pg 373-376.
  2. Emergency Nurses Association (2005). Lorene Newberry; Laura M. Criddle, eds. Sheehy's Manual of Emergency Care (6th ed.). St Louis, Missouri: Elsevier Mosby. pp. 655–657.
  3. Keel M, Meier C (December 2007). "Chest injuries - what is new?". Current Opinion in Critical Care. 13 (6): 674–9. doi:10.1097/MCC.0b013e3282f1fe71. PMID 17975389.
  4. "OVERVIEW paradoxical breathing". Oxford Reference. Retrieved 7 Sep 2013.
  5. Yamamoto L, Schroeder C, Morley D, Beliveau C (2005). "Thoracic trauma: The deadly dozen". Critical Care Nursing Quarterly. 28 (1): 22–40. doi:10.1097/00002727-200501000-00004. PMID 15732422.
  6. Hemmila MR, Wahl WL (2005). "Management of the injured patient". In Doherty GM. Current Surgical Diagnosis and Treatment. McGraw-Hill Medical. p. 214. ISBN 0-07-142315-X. Retrieved 2008-07-04.
  7. Coughlin, TA; Ng, JW; Rollins, KE; Forward, DP; Ollivere, BJ (August 2016). "Management of rib fractures in traumatic flail chest: a meta-analysis of randomised controlled trials.". The bone & joint journal. 98–B (8): 1119–25. PMID 27482027.
  8. Molnar TF (2007). "(Video Assisted) thoracoscopic surgery: Getting started". J Minim Access Surg. 3 (4): 173–7. doi:10.4103/0972-9941.38912. PMC 2749201Freely accessible. PMID 19789679.
  9. Bemelman M, Poeze M, Blokhuis TJ, and Leenen LP. Historic overview of treatment techniques for rib facturs and flail chest. Eur J Trauma Emerg Surg. 36(5): 407-415, 2010.
  10. Marasco SF, Davies AR, Cooper J, Varma D, Bennett V, Nevill R, Lee G, Bailey M, & Fitzgerald M. Prospective Randomized Controlled Trial of Operative Rib Fixation in Traumatic Flail Chest. Journal of the American College of Surgeons 216(5): 924-932, 2013.
  11. Borman, JB, L Aharonson-Daniel, B Savitsky, et al. Unilateral flail chest is seldom a lethal injury. Emerg Med J. 23. (2006). P. 903-905.
  12. Bjerke, H Scott (2006-06-16). "Flail Chest". eMedicine. Retrieved 2007-08-01.
  13. Gipson CL and Tobias JD. Flail Chest in a Neonate Resulting from Nonaccidental Trauma. Southern Medical Journal 99(5): 536-538, 2006.
  14. Granetzny A; Abd El-Aal, M; Emam, E; Shalaby, A; Boseila, A (2005). "Surgical versus conservative treatment of flail chest. Evaluation of the pulmonary status". Interact Cardiovasc Thorac Surg. 4 (6): 583–7. doi:10.1510/icvts.2005.111807. PMID 17670487.
  15. 1 2 Ciesla, Nancy D. "Chest Physical Therapy for Patients in the Intensive Care Unit". Journal of the American Physical Therapy Association (1996) 76:609-625.
  16. Kigin, Colleen M. "Chest Physical Therapy for the Postoperative or Traumatic Injury Patient". Journal of the American Physical Therapy Association (1981) 61:1724-1736.
  17. 1 2 3 4 Kumar, Senthil. "Post Operative Physiotherapy Management for Flail Chest". http://www.scribd.com/doc/59432747/Post-operative-physiotherapy-management-for-flail-chest-or-Multiple-ribs-fracture-or-Cardio-pulmonary-rehabilitation-or-physiotherapy-or-physical-ther
  18. Richardson, J. David M.D, Lee Adams M.D, Lewis M. Flint, M.D. Selective Management of Flail Chest and Pulmonary Contusion. Department of Surgery, University of Louisville, School of Medicine, Louisville, Kentucky.
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