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Emergency And Acute Medicine – Femur Fracture
Overview And Classification
Femoral fractures are classified by location, fracture geometry, degree of comminution, and soft tissue involvement. Fractures may involve the proximal third including the subtrochanteric region, the midshaft, or the distal metaphyseal–diaphyseal junction. Fracture geometry includes spiral, transverse, oblique, or segmental patterns and may be open or closed. Two commonly used classification systems are the AO/OTA system and the Winquist and Hansen classification, which categorizes fractures by the degree of comminution and stability. Grade I fractures involve minimal cortical loss and are lengthwise and rotationally stable, while Grade IV fractures demonstrate circumferential cortical loss and are unstable in all planes.
Etiology And Risk Factors
Femoral fractures typically result from high-energy trauma and are most commonly seen in young adults involved in motor vehicle collisions, gunshot wounds, or high-impact falls. Spiral fractures may occur with falls from height. Pathologic fractures should be considered when fractures occur after minor mechanisms, and stress fractures may result from repetitive activity. Complications include hemorrhage, compartment syndrome, fat embolism, and acute respiratory distress syndrome. In older adults, atypical femur fractures have been associated with bisphosphonate use. In children younger than three years, a significant proportion of femoral fractures result from nonaccidental trauma, and spiral fractures are particularly concerning.
Clinical Presentation
Patients typically present with severe thigh pain, deformity, swelling, shortening of the limb, and inability to move the hip or knee. Femur fractures frequently occur as part of multisystem trauma and may be associated with injuries to the chest, abdomen, pelvis, hip, or knee. Physical examination may reveal hypotension due to hemorrhage into the thigh, which can hold several units of blood. Distal neurovascular compromise or compartment syndrome may also be present.
Essential Evaluation
Initial evaluation includes radiographic imaging and careful assessment of distal pulses, sensation, motor function, and compartment firmness. Doppler evaluation or angiography may be required if pulses are diminished or asymmetric. Associated injuries should be sought in all patients with high-energy mechanisms. In children with suspected nonaccidental trauma, a skeletal survey or bone scan is indicated.
Diagnostic Studies And Interpretation
Laboratory studies include a complete blood count and type and cross-match due to the risk of significant blood loss. Imaging should include an anteroposterior pelvis, true lateral hip view, anteroposterior and lateral views of the femur, and a complete knee series. Chest radiography and additional imaging should follow trauma protocols as indicated.
Management And Initial Stabilization
Prehospital care includes immobilization of the extremity and use of a traction splint when appropriate to reduce pain and tamponade bleeding. Traction is contraindicated in fractures near the knee, ipsilateral hip fractures or dislocations, pelvic fractures, or lower leg fractures. Open fractures should not be reduced in the field and must be covered with sterile dressings. Patients require close monitoring for hemorrhagic shock.
Emergency Department Treatment
Airway, chest, and abdominal injuries take priority. Pain control should be provided with parenteral analgesia or femoral nerve block, particularly in pediatric or polytrauma patients. Orthopedic consultation is required for all femur fractures and is emergent when neurovascular compromise is present. Open fractures require immediate operative irrigation and debridement. Antibiotic therapy is indicated for open fractures, typically with cefazolin or clindamycin in patients with allergies, with additional coverage for extensive contamination. Skeletal traction should be applied if operative fixation is delayed. Vascular injury requires immediate angiography or surgical exploration.
Disposition And Follow Up
All femur fractures require hospital admission except in rare circumstances involving nonambulatory patients or pathologic fractures managed nonoperatively in consultation with orthopedics. Any suspicion of nonaccidental trauma mandates admission and further evaluation. Follow-up care is determined by the orthopedic surgeon based on fracture type and clinical course.
Key Clinical Insights And Common Errors
Femoral fractures result from high-energy trauma, and clinicians must maintain a high index of suspicion for associated life-threatening injuries. Neurovascular status should be carefully documented on arrival and reassessed frequently. In pediatric patients, femoral fractures do not always require operative management, but nonaccidental trauma must always be considered and evaluated appropriately.
Overview And Classification
Femoral fractures are classified by location, fracture geometry, degree of comminution, and soft tissue involvement. Fractures may involve the proximal third including the subtrochanteric region, the midshaft, or the distal metaphyseal–diaphyseal junction. Fracture geometry includes spiral, transverse, oblique, or segmental patterns and may be open or closed. Two commonly used classification systems are the AO/OTA system and the Winquist and Hansen classification, which categorizes fractures by the degree of comminution and stability. Grade I fractures involve minimal cortical loss and are lengthwise and rotationally stable, while Grade IV fractures demonstrate circumferential cortical loss and are unstable in all planes.
Etiology And Risk Factors
Femoral fractures typically result from high-energy trauma and are most commonly seen in young adults involved in motor vehicle collisions, gunshot wounds, or high-impact falls. Spiral fractures may occur with falls from height. Pathologic fractures should be considered when fractures occur after minor mechanisms, and stress fractures may result from repetitive activity. Complications include hemorrhage, compartment syndrome, fat embolism, and acute respiratory distress syndrome. In older adults, atypical femur fractures have been associated with bisphosphonate use. In children younger than three years, a significant proportion of femoral fractures result from nonaccidental trauma, and spiral fractures are particularly concerning.
Clinical Presentation
Patients typically present with severe thigh pain, deformity, swelling, shortening of the limb, and inability to move the hip or knee. Femur fractures frequently occur as part of multisystem trauma and may be associated with injuries to the chest, abdomen, pelvis, hip, or knee. Physical examination may reveal hypotension due to hemorrhage into the thigh, which can hold several units of blood. Distal neurovascular compromise or compartment syndrome may also be present.
Essential Evaluation
Initial evaluation includes radiographic imaging and careful assessment of distal pulses, sensation, motor function, and compartment firmness. Doppler evaluation or angiography may be required if pulses are diminished or asymmetric. Associated injuries should be sought in all patients with high-energy mechanisms. In children with suspected nonaccidental trauma, a skeletal survey or bone scan is indicated.
Diagnostic Studies And Interpretation
Laboratory studies include a complete blood count and type and cross-match due to the risk of significant blood loss. Imaging should include an anteroposterior pelvis, true lateral hip view, anteroposterior and lateral views of the femur, and a complete knee series. Chest radiography and additional imaging should follow trauma protocols as indicated.
Management And Initial Stabilization
Prehospital care includes immobilization of the extremity and use of a traction splint when appropriate to reduce pain and tamponade bleeding. Traction is contraindicated in fractures near the knee, ipsilateral hip fractures or dislocations, pelvic fractures, or lower leg fractures. Open fractures should not be reduced in the field and must be covered with sterile dressings. Patients require close monitoring for hemorrhagic shock.
Emergency Department Treatment
Airway, chest, and abdominal injuries take priority. Pain control should be provided with parenteral analgesia or femoral nerve block, particularly in pediatric or polytrauma patients. Orthopedic consultation is required for all femur fractures and is emergent when neurovascular compromise is present. Open fractures require immediate operative irrigation and debridement. Antibiotic therapy is indicated for open fractures, typically with cefazolin or clindamycin in patients with allergies, with additional coverage for extensive contamination. Skeletal traction should be applied if operative fixation is delayed. Vascular injury requires immediate angiography or surgical exploration.
Disposition And Follow Up
All femur fractures require hospital admission except in rare circumstances involving nonambulatory patients or pathologic fractures managed nonoperatively in consultation with orthopedics. Any suspicion of nonaccidental trauma mandates admission and further evaluation. Follow-up care is determined by the orthopedic surgeon based on fracture type and clinical course.
Key Clinical Insights And Common Errors
Femoral fractures result from high-energy trauma, and clinicians must maintain a high index of suspicion for associated life-threatening injuries. Neurovascular status should be carefully documented on arrival and reassessed frequently. In pediatric patients, femoral fractures do not always require operative management, but nonaccidental trauma must always be considered and evaluated appropriately.
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