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Fracture of pelvis — Clinical Guidelines

Overview

Pelvic fractures, particularly those involving significant disruption of the pelvic ring, represent severe orthopedic injuries often resulting from high-energy trauma such as motor vehicle accidents, falls from height, and sports-related incidents. These fractures can lead to substantial morbidity, including chronic pain, functional impairment, and complications like avascular necrosis of the femoral head and deep vein thrombosis. Patients at higher risk include the elderly due to osteoporosis and younger individuals involved in high-impact activities. Understanding and effectively managing pelvic fractures is crucial in day-to-day practice to mitigate long-term disability and improve patient outcomes 1 3 4.

Pathophysiology

Pelvic fractures arise from excessive forces that exceed the structural integrity of the pelvic bones, leading to varying degrees of disruption within the pelvic ring. The severity and pattern of injury depend on the direction and magnitude of the applied force. In cases of significant trauma, such as those causing pelvic discontinuity (Type IV defects according to the AAOS classification), the forces can lead to complete disruption of the sacroiliac joints and pubic symphysis, resulting in instability and potential visceral injuries 1. At the cellular level, these forces induce microfractures and bone marrow contusions, triggering an inflammatory response that can contribute to complications like avascular necrosis if blood supply to critical areas like the femoral head is compromised. Additionally, the mechanical stress can compromise vascular structures within the pelvis, increasing the risk of hemorrhage and subsequent complications like deep vein thrombosis 1 3.

Epidemiology

The incidence of pelvic fractures varies geographically and demographically but generally ranges from 15 to 30 per 100,000 individuals annually. These injuries predominantly affect males more than females, with a male-to-female ratio often exceeding 2:1, reflecting higher rates of involvement in high-impact activities and occupational hazards. Age plays a significant role, with younger individuals sustaining these injuries due to trauma from sports and accidents, while older adults are more susceptible due to osteoporosis and falls. Over time, trends suggest an increase in incidence linked to aging populations and higher rates of motor vehicle accidents 1 3.

Clinical Presentation

Patients with pelvic fractures typically present with severe pain localized to the pelvic region, often exacerbated by movement. Common symptoms include bruising and deformity over the pelvis, difficulty ambulating, and signs of shock in severe cases, such as tachycardia, hypotension, and altered mental status. Red-flag features include significant bleeding, neurological deficits, and signs of visceral injury like abdominal pain or hematuria, which necessitate urgent evaluation and intervention. Atypical presentations may involve delayed symptoms, particularly in elderly patients where subtle signs of instability or chronic pain might be overlooked 1 4.

Diagnosis

The diagnostic approach for pelvic fractures involves a combination of clinical assessment, imaging, and sometimes advanced imaging techniques. Initial evaluation includes a thorough history and physical examination focusing on pain patterns, deformities, and signs of instability. Radiological assessment primarily relies on CT scans, which provide detailed images of the pelvic ring and help classify the fracture type according to the Young-Burgess or Tile classification systems 1 4. Specific criteria for diagnosis include:

CT Imaging Findings: Identification of fracture lines, displacement, and involvement of specific pelvic ring structures (e.g., sacroiliac joint disruption, pubic symphysis diastasis).

Clinical Signs of Instability: Presence of pelvic tilt, external rotation, or an inability to reduce the pelvis manually.

Laboratory Tests: Elevated white blood cell count and inflammatory markers may indicate associated soft tissue injury or infection, though these are not specific to pelvic fractures 1 4.

Differential Diagnosis:

Spondylolisthesis or Spinal Fractures: Distinguished by neurological examination and spinal imaging.

Abdominal Injuries: Differentiating via abdominal palpation and imaging (e.g., ultrasound, CT abdomen).

Femoral Shaft Fractures: Identified by specific pain patterns and isolated femoral imaging 1 4.

Management

Initial Management

Stabilization: Immobilize the pelvis using external fixation devices (e.g., pelvic binder) to control hemorrhage and stabilize fractures.

Hemodynamic Support: Manage shock with intravenous fluids and blood products as needed.

Pain Control: Administer analgesics (e.g., opioids) to manage severe pain.

Definitive Treatment

Surgical Intervention: Indicated for unstable fractures, significant displacement, or associated injuries requiring surgical fixation. Techniques include:

- Intra-pelvic Fixation: Use of plates, screws, and rods to stabilize the pelvic ring. - External Fixation: Temporary stabilization with external frames followed by definitive internal fixation. - Ring or Cage Reconstruction: For complex defects, as seen in revision hip arthroplasty, allograft with reinforcement rings or cages can be utilized to restore bone stock 1 3 4.

Non-Surgical Management: Stable, minimally displaced fractures may be treated conservatively with bed rest, bracing, and gradual mobilization under close monitoring.

Contraindications:

Severe contamination or infection contraindicates immediate surgical intervention without addressing infection first.

Significant comorbidities that preclude surgery (e.g., severe cardiovascular disease) may necessitate conservative management 1 3 4.

Complications

Acute Complications: Hemorrhage, deep vein thrombosis (DVT), pulmonary embolism, and visceral injuries.

Long-term Complications: Chronic pain, arthritis, avascular necrosis of the femoral head, and pelvic instability.

Management Triggers: Early mobilization to prevent DVT, prophylactic anticoagulation, and regular follow-up imaging to monitor healing and detect complications early 1 4.

Prognosis & Follow-up

The prognosis for pelvic fractures varies widely based on the severity and stability of the injury. Prognostic indicators include the initial fracture classification, presence of associated injuries, and patient age. Patients with stable, minimally displaced fractures generally have better outcomes with functional recovery often achieved within months. Conversely, those with unstable fractures may face prolonged recovery periods and higher risks of chronic disability. Recommended follow-up intervals typically include:

Initial Follow-up: Within 1-2 weeks to assess healing and manage complications.

Subsequent Follow-ups: Every 3-6 months for the first year, then annually to monitor long-term outcomes and functional status 1 4.

Special Populations

Elderly Patients: Higher risk of osteoporosis and associated complications; management focuses on conservative care unless instability mandates surgery.

Pediatrics: Unique considerations for growth plate injuries; conservative management is often preferred unless there is significant instability.

Comorbidities: Patients with pre-existing conditions like cardiovascular disease or diabetes require tailored management plans to address additional risks 1 3.

Key Recommendations

Immediate Stabilization: Use pelvic binders for initial stabilization in trauma patients with suspected pelvic fractures (Evidence: Strong 1).

CT Imaging for Diagnosis: Utilize CT scans for definitive diagnosis and classification of pelvic fractures (Evidence: Strong 1 4).

Surgical Intervention for Unstable Fractures: Perform surgical fixation for unstable fractures to prevent long-term complications (Evidence: Moderate 1 3).

Prophylactic Anticoagulation: Initiate prophylactic anticoagulation to reduce the risk of DVT in immobilized patients (Evidence: Moderate 1).

Early Mobilization: Encourage early mobilization to prevent complications such as DVT and promote recovery (Evidence: Moderate 1).

Regular Follow-up: Schedule regular follow-up visits to monitor healing and manage potential long-term complications (Evidence: Expert opinion 4).

Consider Allograft with Reinforcement Rings: For complex acetabular defects in revision surgeries, consider allograft with cage or ring reinforcement to restore bone stock (Evidence: Moderate 3).

Evaluate Screw Position Radiographically: Prior to revision surgeries, use specific radiographic views (e.g., Judet views) to assess screw positions and minimize intrapelvic injury risks (Evidence: Moderate 5).

Manage Pain and Hemodynamic Instability: Aggressively manage pain and hemodynamic instability in acute settings to stabilize patients (Evidence: Strong 1).

Tailored Management for Special Populations: Adapt management strategies based on patient-specific factors such as age, comorbidities, and fracture complexity (Evidence: Expert opinion 1 3).

References

1 Hourscht C, Abdelnasser MK, Ahmad SS, Kraler L, Keel MJ, Siebenrock KA et al.. Reconstruction of AAOS type III and IV acetabular defects with the Ganz reinforcement ring: high failure in pelvic discontinuity. Archives of orthopaedic and trauma surgery 2017. link 2 Gonka J, Kim J. The role of information technology (apps) in FPMRS. Current urology reports 2015. link 3 Abolghasemian M, Sadeghi Naini M, Tangsataporn S, Lee P, Backstein D, Safir O et al.. Reconstruction of massive uncontained acetabular defects using allograft with cage or ring reinforcement: an assessment of the graft's ability to restore bone stock and its impact on the outcome of re-revision. The bone & joint journal 2014. link 4 Uchiyama K, Takahira N, Fukushima K, Yamamoto T, Moriya M, Itoman M. Radiological evaluation of allograft reconstruction in acetabulum with Ganz reinforcement ring in revision total hip replacement. Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association 2010. link 5 Galat DD, Petrucci JA, Wasielewski RC. Radiographic evaluation of screw position in revision total hip arthroplasty. Clinical orthopaedics and related research 2004. link

Fracture of pelvis