Femoral shaft fractures are high-energy injuries (motor vehicle collisions, falls from height, gunshot wounds) in young adults and low-energy injuries (ground-level falls) in the elderly with osteoporotic bone. They require admission and operative fixation in virtually all adult cases, with locked intramedullary nailing (IMN) as the gold standard treatment. [1-2] Estimated blood loss from a closed femoral shaft fracture is 1,000–1,500 mL, though isolated femoral shaft fractures rarely cause hypotensive shock on their own — if shock is present, search for other bleeding sources. [3-5]
1. History
- Mechanism of injury: High-energy (MVC, pedestrian struck, fall from height, GSW) vs. low-energy (ground-level fall in elderly/osteoporotic patients, bisphosphonate-associated atypical fracture) [6-7]
- Characterize pain: location (thigh), onset (acute), inability to bear weight, deformity
- Timing: time from injury to presentation (critical for surgical planning and FES risk)
- Associated symptoms: numbness/tingling distally (vascular/nerve injury), hip or knee pain (concomitant fractures), dyspnea or confusion (fat embolism)
- Important negatives: loss of consciousness, chest/abdominal pain, pelvic pain, neck/back pain
- In children <3 years: mechanism must be scrutinized for nonaccidental trauma [8]
2. Alarm Features
- Hemorrhagic shock: tachycardia, hypotension — search for other bleeding sources (chest, abdomen, pelvis) as isolated femur fractures rarely cause class III/IV shock [4-5]
- Open fracture: skin breach with exposed bone; doubles estimated blood loss [3]
- Fat embolism syndrome (FES): classic triad of respiratory distress, altered mental status, and petechial rash typically 12–72 hours post-injury; can present as early as 4 hours [9-11]
- Vascular injury: absent or diminished distal pulses, expanding hematoma, hard signs of vascular injury
- Compartment syndrome: tense thigh swelling, pain out of proportion, pain with passive stretch
- Bilateral femur fractures: significantly higher FES risk (4.6% vs. 2.9% unilateral) [12]
3. Medications
- Acute pain management (multimodal approach recommended by ACS): [13]
- Femoral nerve block (FNB): 20 mL of 0.5% bupivacaine, ultrasound-guided; reduces pain by ~3.6 points on VAS and significantly decreases opioid requirements [14-15]
- Analgesic-dose ketamine: 0.1–0.3 mg/kg IV; attractive option in hemodynamically unstable patients due to minimal hemodynamic effects [13]
- Fentanyl: preferred opioid in resuscitation phase due to minimal hemodynamic effects; short half-life requires frequent reassessment [13]
- Avoid morphine in hemodynamically unstable patients
- VTE prophylaxis: enoxaparin 30 mg SQ BID or aspirin 81 mg BID (PREVENT CLOT trial demonstrated noninferiority of aspirin to LMWH for death prevention at 90 days) [16]
- Tranexamic acid: may reduce perioperative blood loss; 1 g IV bolus + 1 g over 8 hours [17]
- Contraindicated: NSAIDs should be used cautiously in the acute setting given bleeding risk; avoid excessive crystalloid resuscitation [18]
4. Diet
- NPO on presentation in anticipation of operative fixation
- Adequate calcium and vitamin D supplementation in the recovery phase, especially in elderly/osteoporotic patients [19]
- High-protein diet during recovery to support fracture healing
- Hydration to support resuscitation and prevent renal complications from rhabdomyolysis
5. Review of Systems
- Pulmonary: dyspnea, chest pain, cough (PE, FES, ARDS)
- Neurologic: confusion, altered mental status, headache (FES, TBI)
- Skin: petechial rash (axillae, conjunctivae — FES) [9-10]
- Musculoskeletal: hip pain, knee pain, back pain (associated fractures)
- GI/GU: abdominal pain, hematuria (associated injuries in polytrauma)
- Vascular: cold/numb foot, paresthesias (vascular or nerve injury)
6. Collateral History and Family History
- Witnesses to mechanism (speed, height of fall, ejection from vehicle)
- In pediatric patients: inconsistency between mechanism and injury pattern raises concern for nonaccidental trauma [8]
- Anticoagulant/antiplatelet use (increases blood loss significantly) [20]
- History of osteoporosis, bisphosphonate use (atypical femur fractures) [7][21]
- Family history of bleeding disorders, VTE, osteoporosis
- Social context: substance use (intoxication at time of injury), functional baseline
7. Risk Factors
- Young males: most commonly affected demographic (high-energy mechanisms) [6]
- Elderly with osteoporosis: low-energy fractures from ground-level falls [7]
- Bisphosphonate use: atypical femoral fractures (lateral cortex, transverse pattern) [21]
- Obesity and diabetes mellitus: independent risk factors for FES [22]
- Bilateral femur fractures: higher complication rates [9][12]
- Polytrauma: ISS >18 associated with increased pulmonary complications [23]
- Pathologic fractures (metastatic disease)
8. Differential Diagnosis
- Pathologic fracture: metastatic disease (breast, lung, prostate, renal, thyroid), primary bone tumors — suspect with low-energy mechanism in non-osteoporotic patients
- Hip fracture (femoral neck, intertrochanteric): pain may be referred to thigh; obtain full-length femur films including hip and knee
- Distal femur fracture: intra-articular extension changes management
- Femoral stress fracture: insidious onset in runners/military recruits
- Bisphosphonate-associated atypical fracture: lateral cortex, prodromal thigh pain, transverse fracture line [21]
- Soft tissue injury without fracture: severe contusion, muscle tear — ruled out by imaging
9. Past Medical History
- Prior femur fractures or hardware
- Osteoporosis/osteopenia, metabolic bone disease
- Malignancy (pathologic fracture risk)
- Chronic anticoagulation (warfarin, DOACs)
- Bisphosphonate use (duration matters)
- Chronic kidney disease (bone quality)
- Previous DVT/PE
- Cardiac/pulmonary comorbidities (affect surgical risk and FES tolerance)
10. Physical Exam
- Vital signs: tachycardia (early sign of hemorrhage), hypotension (late; search for other sources) [4][24]
- Inspection: shortened, externally rotated limb; visible deformity; swelling of thigh; open wound assessment (Gustilo-Anderson classification if open)
- Palpation: tenderness over femoral shaft; crepitus; assess for tense compartments
- Neurovascular exam: distal pulses (dorsalis pedis, posterior tibial), capillary refill, sensation (saphenous, deep/superficial peroneal, tibial, sural distributions), motor function of foot/ankle
- Skin: petechiae (axillae, conjunctivae, chest) — FES [9]
- Secondary survey: examine ipsilateral hip and knee (associated injuries common), pelvis, spine, chest, abdomen
11. Lab Studies
- CBC: baseline hemoglobin (admission Hb is the strongest predictor of transfusion need); serial monitoring recommended as hidden blood loss averages ~1,445 mL [25-26]
- Type and screen/crossmatch: anticipate potential transfusion (average 2.5 units PRBCs if needed) [27]
- BMP: electrolytes, renal function
- Coagulation studies: PT/INR, PTT (especially if on anticoagulants)
- Lactate and base deficit: markers of tissue hypoperfusion/occult shock [24]
- Urinalysis: myoglobinuria if concern for rhabdomyolysis
- If FES suspected: thrombocytopenia, anemia, elevated D-dimer, decreased PaO₂ are supportive findings [28]
12. Imaging
- First-line: AP and lateral radiographs of the entire femur, including hip and knee joints (to rule out associated fractures)
- Chest X-ray and pelvis X-ray: standard in trauma workup
- CT angiography: if hard signs of vascular injury or ABI <0.9
- CT chest: if FES suspected (bilateral ground-glass opacities, patchy exudates) [28]
- MRI brain: gold standard for cerebral FES (starfield pattern of diffusion restriction) [11]
- FAST exam: in polytrauma to evaluate for intra-abdominal hemorrhage [24]
- Classification: AO/OTA system — Type 32A (simple), 32B (wedge), 32C (complex/comminuted) [29]
13. Special Tests
- Ankle-brachial index (ABI): if concern for vascular injury; ABI <0.9 warrants CT angiography
- Compartment pressure measurement: if clinical suspicion for compartment syndrome (delta pressure <30 mmHg is diagnostic)
- Gurd and Wilson criteria for FES diagnosis: major criteria (petechial rash, respiratory insufficiency, cerebral involvement) and minor criteria (tachycardia, fever, retinal changes, fat macroglobulinemia, thrombocytopenia) [10]
- Injury Severity Score (ISS): guides damage control vs. early total care decision-making [18]
14. ECG
- Obtain in all trauma patients, especially elderly or those with cardiac history
- Evaluate for: sinus tachycardia (hemorrhage, pain, FES), right heart strain pattern (acute PE/FES), arrhythmias
- ST changes may indicate demand ischemia from hemorrhage-related anemia
15. Assessment
- Femoral shaft fractures are surgical emergencies requiring admission and operative fixation in adults [1][30]
- Severity stratification per Pape classification: [18]
- Stable: isolated injury, hemodynamically normal → early definitive fixation (IMN)
- Borderline: ISS 20–40, pulmonary contusion, moderate TBI → individualized decision
- Unstable: ISS >40, hypothermia, coagulopathy → damage control (external fixation)
- In extremis: persistent shock despite resuscitation → damage control orthopaedics
- Complications: FES (incidence ~1.7% in modern era, down from ~8% historically), nonunion (2–5%), malunion, infection, VTE, ARDS, compartment syndrome [12]
16. Treatment Plan
- Initial stabilization:
- ABCs, ATLS protocol; splint the fracture (traction splint vs. static splint — evidence for traction splinting benefit is uncertain) [31]
- IV access, fluid resuscitation; type and crossmatch
- Femoral nerve block for analgesia (20 mL 0.5% bupivacaine, ultrasound-guided) [14]
- Analgesic-dose ketamine (0.1–0.3 mg/kg IV) as adjunct [13]
- Definitive treatment — locked intramedullary nailing is the gold standard: [1-2]
- Antegrade (piriformis fossa or trochanteric entry): preferred for most shaft fractures
- Retrograde: useful for ipsilateral knee injuries, bilateral fractures, pregnancy, morbid obesity
- Union rate >95%; average time to union ~5–6 months [29][32]
- Major complication rate ~5.4% with IMN vs. ~21.9% with external fixation [1]
- Timing: The Eastern Association for the Surgery of Trauma (EAST) recommends early fixation (<24 hours), which trends toward lower infection, mortality, and VTE rates. In polytrauma patients who are unstable or in extremis, damage control orthopaedics with temporary external fixation followed by staged IMN is appropriate [18][23][30]
- Pediatric considerations: [8][33]
- <6 months: Pavlik harness
- 6 months–5 years: hip spica casting
- 5–11 years: flexible intramedullary nails
- 11–12 years: rigid locked intramedullary nails or submuscular plating
- VTE prophylaxis: initiate early; aspirin 81 mg BID is noninferior to enoxaparin 30 mg BID for preventing death (PREVENT CLOT trial); continue for up to 4 weeks post-injury [16][34]
17. Disposition
- All adult femoral shaft fractures require admission for operative fixation [23][30]
- ICU admission criteria: polytrauma, hemodynamic instability, bilateral femur fractures, signs of FES, TBI, need for damage control resuscitation
- Floor admission: isolated stable fracture, hemodynamically normal, awaiting OR
- Orthopedic surgery consultation: mandatory and urgent in all cases
- Vascular surgery consultation: if hard signs of vascular injury or abnormal ABI
- Trauma surgery consultation: in polytrauma patients
18. Follow Up / Return Precautions
- Postoperative follow-up: radiographic follow-up at 2 weeks, 6 weeks, 3 months, and 6 months; clinical follow-up typically to 6 months for uncomplicated extra-articular fractures [35]
- Weight-bearing: typically weight-bearing as tolerated after locked IMN; individualized based on fracture pattern and fixation stability
- Expected recovery: most patients achieve bone union by 5–6 months; gait normalizes by ~6 months in pediatric patients [36]
- Return precautions — seek immediate care for:
- Increasing pain, swelling, or deformity at the fracture site
- Fever, wound drainage, redness (infection)
- Chest pain, shortness of breath (PE/FES)
- Calf swelling or pain (DVT)
- Numbness, tingling, or weakness in the foot (neurovascular compromise)
- Inability to bear weight as previously instructed
- Hardware removal: generally not required in adults unless symptomatic; recommended in pediatric patients after healing (6–12 months) to prevent periprosthetic fracture and buried hardware [37]
- Osteoporosis workup: DEXA scan and metabolic bone labs in elderly patients with low-energy fractures [19]
Images
References
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