Rib Fractures: Anatomy, Treatment, and Management

Rib fractures are a common injury, accounting for a significant percentage of blunt trauma hospital admissions. These fractures can range from minor, nondisplaced breaks to severe, life-threatening conditions like flail chest. Understanding the anatomy of the ribs, the mechanisms of injury, and the various treatment options is crucial for effective management and improved patient outcomes.

Introduction

Accounting for 10% of blunt trauma hospital admissions, rib fractures are a frequent injury encountered in the context of orthopedic trauma. The prevalence of at least one rib fracture increases to 60-80% in patients with blunt chest trauma. Diagnosis has improved over the years, mainly due to clinical suspicion as well as improvement in advanced imaging with CT scanning. This leads to a timely diagnosis which can help reduce the sequelae and morbidity of this injury. The mainstay of treatment is often nonoperative management. Recently, a rise in operative management of rib fractures has become apparent. Open reduction internal fixation (ORIF) of rib fractures has been shown to reduce complications of rib fractures, including pneumonia, reduce time on the ventilator, and reduce mortality.

Anatomy of the Rib Cage

The osseous thoracic cage consists of 12 pairs of ribs, which are grouped based on their anterior relationship to the sternum. Ribs 1-7 are known as "true ribs" because they connect directly to the sternal notches via their costal cartilages. Ribs 8-10 are "false ribs" as they connect indirectly to the sternum through their costal cartilages, which attach to the costal cartilage of the rib above, forming the costal margin. Ribs 11 and 12 are "floating ribs" because they do not attach to the sternum at all.

Each rib has distinct bony features from posterior to anterior:

Head: Articulates with the thoracic spine via zygapophyseal joints. Ribs 1, 11, and 12 articulate with only the corresponding thoracic vertebrae, while ribs 2-10 articulate with the corresponding costal facet and the one superior.
Neck: Connects the head to the costal tubercle.
Costal Tubercle: Articulates with the transverse process of the corresponding vertebrae.
Costal Angle: The point where the rib begins to curve sharply forward.
Shaft: The main body of the rib. Each rib contains an inferior costal groove, which houses the intercostal neurovascular bundle.

Function of the Thoracic Cage

The primary function of the thoracic cage is respiration. The ribs, along with the diaphragm and accessory respiratory muscles, facilitate the expansion and compression of the lungs. The ribs move superiorly and inferiorly in a "bucket handle" motion, while the sternum moves anteriorly and posteriorly in a "pump handle" motion. These coordinated movements change the pressure and volume within the lungs, allowing for breathing.

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Accessory muscles of inspiration, such as the sternocleidomastoid, scalene, and external intercostal muscles, increase the volume of the thoracic cage. Accessory muscles of expiration, including the internal intercostal, rectus abdominis, external and internal oblique, and transverse abdominis muscles, decrease lung volume.

Causes and Risk Factors

Rib fractures typically result from significant force applied to the chest. Common causes include:

Motor vehicle accidents: High-impact collisions can cause significant chest trauma.
Falls: Especially in the elderly, falls are a frequent cause of rib fractures.
Sports injuries: Direct trauma or overuse can lead to rib fractures.
Severe coughing: In individuals with weakened bones (e.g., osteoporosis) or underlying lung disease, forceful coughing can cause spontaneous rib fractures.

Older patients are more susceptible to rib fractures and experience increased morbidity and mortality as a result. In children, rib fractures are less common due to the greater flexibility of their bones, and may be indicative of severe trauma or child abuse.

Presentation and Diagnosis

Patients with rib fractures may present with a variety of symptoms, including:

Pain: Worsened by deep respiration or movement.
Point tenderness: Localized pain upon palpation of the fracture site.
Decreased lung sounds: May indicate underlying lung injury.
Retention of pulmonary secretions: Can lead to pneumonia.
Respiratory distress: Difficulty breathing.
Paradoxical lung motion: Seen in flail chest, where a segment of the chest wall moves in the opposite direction of the rest of the chest during respiration.

The intensity of symptoms typically increases with the number and severity of rib fractures. For instance, patients with flail chest are more likely to experience severe pain and respiratory failure.

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Diagnosis involves a combination of clinical assessment and imaging studies. A thorough history and physical examination can reveal the mechanism of injury and specific areas of pain and tenderness.

Imaging modalities used to diagnose rib fractures include:

Chest Radiographs: Historically, standard chest X-rays have been used, but they have limited sensitivity and may miss fractures due to organ overlap or fractures being outside the image range. Oblique views on expiration may improve detection.
Computed Tomography (CT) Scan: CT scans are more sensitive than radiographs and can detect a greater number of rib fractures. They are also valuable for assessing associated injuries.
Magnetic Resonance Imaging (MRI): MRI can identify more rib fractures and has a higher sensitivity than CT.

Treatment Options

Nonoperative Management

Traditional treatment for rib fractures is primarily nonoperative, with a focus on pain management and supportive care. Approximately 80% of patients with multiple rib fractures show signs of healing on CT scans within three months of injury.

Nonoperative treatments include:

Pain Management:
- Nonsteroidal anti-inflammatory drugs (NSAIDs)
- Paravertebral nerve blocks (serratus anterior and erector spinae)
- Epidural analgesic injections
Pulmonary Physical Therapy: To improve lung function and prevent complications.
Incentive Spirometry: To encourage deep breathing and prevent pneumonia.
Supplemental Oxygen: If needed to maintain adequate oxygen saturation.
Mechanical Ventilation: In severe cases of respiratory distress or failure.

Effective pain management is crucial to prevent pneumonia, a common complication of rib fractures.

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Operative Management: Open Reduction and Internal Fixation (ORIF)

In recent years, there has been an increase in the use of ORIF for rib fractures, especially in cases of chest wall instability, such as flail chest. ORIF has been shown to reduce complications like pneumonia, decrease time on the ventilator, and reduce mortality.

Indications for ORIF include:

Flail Chest: Three or more consecutive ribs broken in at least two places.
Multiple Displaced Fractures: Three or more consecutive ribs with bicortical displacement.
Rib Fracture Nonunion: Failure of the fracture to heal.
Chest Wall Deformity or Defect
Refractory Pain: Persistent pain despite nonoperative treatment, leading to respiratory failure.

While elderly patients were previously considered a contraindication for ORIF, recent studies have shown promising results with operative management, particularly in patients with mild to moderate pulmonary contusions.

Surgical Techniques and Approaches

ORIF typically involves using precontoured, side- and rib-specific plates with threaded holes and self-tapped screws to stabilize the fractured ribs. Although self-absorbing plates have been described, metal plating remains the most common choice of implant.

Fractures of the far posterior rib and paravertebral cartilage can be exposed and plated via the posterior longitudinal approach within the triangle of auscultation. Anterior ribs and associated costal cartilages can also be effectively addressed via ORIF.

Early surgical intervention (within 72 hours of injury) has been shown to decrease the development of pneumonia, reduce ICU stay, and decrease time on mechanical ventilation.

Potential Complications

Blunt thoracic trauma and rib fractures can lead to a variety of complications:

Pneumonia: The most significant complication, closely correlated with mortality.
Chest Pain: Can be chronic and debilitating.
Chest Wall Contusion
Hemothorax: Blood accumulation in the pleural space.
Pneumothorax: Air accumulation in the pleural space, leading to lung collapse.
Contusion of Internal Thoracic Organs
Pneumomediastinum: Air in the mediastinum.
Sternal or Scapular Fracture
Bony Nonunion
Flail Chest
Surgical Site and Hardware Infections: A relatively low risk associated with ORIF.

A prospective study found that a significant percentage of patients with rib fractures experience chronic disability and pain even months after the initial injury.

Costochondritis

Costochondritis is a condition that occurs when some form of trauma is experienced in the front and or side of the rib cage where the cartilage from the sternum meets the ribs. Common examples of the mechanism of injury are swinging a baseball bat, strenuous lifting, a hard tennis serve, severe bouts of coughing, falling on oneâs rib cage, and pitching a baseball. Sometimes the pain can be felt right away, but often it shows up several days later. It can show up circumferentially around the whole rib cage and at other times it can manifest as pinpoint pain. The pain can be alarming because it can feel like a panic attack, a heart attack, and or show up as paradoxical breathing. The pain can present in one spot in the ribs, usually in the front, and laterally. It can be in many spots and can periodically improve, then flare up. It is difficult to obtain a clear diagnosis because the injury often does not show up on an X-ray, or even a CT scan.

The ribs around the lateral regions move like a bucket handle when we breathe. There are multiple joints to consider for hyper and/or hypomobility. The costosternal joints, the thoracic facet joints, the costotransverse joints, and the costovertebral joints should be assessed. When one inhales the bucket handle (lateral ribs) moves upwards and when one exhales the bucket handle descends. That movement occurs roughly about 22,000 to 23,000 times a day. The posterior joints, thoracic facet joints, costovertebral, costotransverse joints, the posterior fascia (thoracolumbar fascia, latissimus dorsi/fascia, serratus posterior inferior/fascia) become profoundly stiff and have myriad adhesions with this condition. The anterior rib joints (costosternal joints) thus move excessively and ârun hotâ. Pain will manifest itself consistently in the front of the ribs and stiffness will be felt in the posterior thoracic region.

Diagnosis it with clinical physical testing corroborated by research. Crowing rooster maneuvers to attempt recreating or worsening pain associated with costochondritis: Left picture: with patientâs hands clasped behind their head; Right picture: with patientâs arms raised to their sides. With each maneuver, patients are asked to extend their neck (look upward) while the helping party gently lifts the arms superiorly and posteriorly. Crossed-chest adduction maneuver to attempt recreating or worsening pain associated with costochondritis. The patient is asked to turn their head toward one shoulder. Bring the patientâs ipsilateral arm across the chest with gentle, but continuous, pressure. This can be repeated with the opposite shoulder and arm, with the head turned to that side to assess for reproduction of bilateral costochondral pain.

The fascia of the mid back is extremely dense. The latissimus dorsi becomes profoundly tight and stiff very easily with pulling, stabilizing the trunk, and heavy lifting activities. The serratus posterior inferior becomes tight and stiff very easily as well. The thoracolumbar fascia (TLC) has a wide surface area of fascia that connects to these areas. The symptoms likely will be delayed a day or two from the activity. Common aggravating activities areâ¦ Sawing, pulling heavy objects, lifting heavy objects out in front of yourself, dips at the gym, bench press, latissimus dorsi pulls at gym, plank, and sleeping on the sore side (lying supine on back is the best position to sleep) Any time you reaggravate your symptoms you restart the inflammation process. Sometimes even performing the below exercises can aggravate symptoms. Reducing inflammation is crucial. More scar tissue and adhesions develop.

Prevention and Patient Education

Given the increased mortality and morbidity associated with rib fractures in the elderly, fall prevention is crucial. Interdisciplinary teams can significantly reduce the risk of falls in the elderly, and clinicians and hospital staff should be trained to provide the necessary tools and resources for fall prevention.

tags: #orthopedics #ribs #anatomy #treatment