Chart — Musculoskeletal
Orthopedic Complication Comparison
After a fracture or orthopedic surgery, four emergencies share the ward: compartment syndrome, fat embolism, pulmonary embolism, and bone infection. They overlap just enough to be confused — and the differentiating finding for each is exactly what exams ask for.
Educational use only. These are emergency-recognition patterns; diagnosis and treatment are provider-directed. Escalate suspected complications immediately per facility protocol. This material supports nursing education and exam review. It is not medical advice and is not a substitute for clinical judgment, institutional policy, or medical direction. Always follow facility protocols and current provider orders.
The Complications Side by Side
| Complication | Setting & Onset | Hallmark Findings | First Nursing Actions |
|---|---|---|---|
| Compartment syndrome | Tibial/forearm fractures, crush injuries, tight casts; first 6–48 h | Pain out of proportion, worse on passive stretch; firm tense compartment; paresthesia early — pulses often still present | Notify provider now; loosen cast/dressing per order; limb at heart level; no ice, no elevation above heart; prep for fasciotomy |
| Fat embolism syndrome (FES) | Long-bone (femur) and pelvic fractures; 12–72 h after injury or fixation | Triad: hypoxemia/dyspnea + neuro changes (confusion, restlessness) + petechiae on chest, axillae, conjunctivae | High-flow oxygen, rapid response, sit upright, supportive care — prevention is early fracture stabilization |
| Pulmonary embolism (VTE) | Immobility, hip/knee surgery, pelvic fracture; typically days into the course | Sudden dyspnea, pleuritic chest pain, tachycardia, hypoxia — no petechiae; often a swollen calf preceding it | Emergent escalation, oxygen, anticipate anticoagulation; prevention bundle is prophylaxis + SCDs + early ambulation |
| Osteomyelitis | Open fractures, fixation pins, surgical hardware; days to weeks | Fever with localized deep bone pain, warmth, drainage; rising WBC/ESR/CRP | Cultures before antibiotics when ordered, pin-site care per protocol, prolonged IV antibiotic adherence teaching |
| Avascular necrosis | Femoral neck fracture, hip dislocation, long-term corticosteroids; months | Progressive groin/hip pain with weight-bearing, decreasing range of motion | Recognize the at-risk patient; reinforce follow-up imaging — late finding, not an emergency on your shift |
FES vs PE — The Pair Everyone Confuses
Both present as sudden respiratory distress in an orthopedic patient, so the differentiators carry the weight: fat embolism arrives earlier (12–72 hours), adds neurologic changes, and announces itself with petechiae — the rash PE never produces. PE typically arrives later in the immobile course, often heralded by a swollen calf, with pleuritic pain dominating. Treatment diverges hard: PE is anticoagulated; FES gets supportive care — which is why the distinction is more than academic.
NCLEX Pearls
- ✦Petechiae on the chest and axillae after a femur fracture = fat embolism syndrome. It is the single most-tested differentiator on this chart.
- ✦Pain on passive stretch with a firm compartment = compartment syndrome — act before pulses change.
- ✦Early surgical stabilization of long-bone fractures is the prevention for FES; mobility and prophylaxis are the prevention for VTE.
- ✦Fever + deep bone pain near hardware or pins = osteomyelitis work-up; cultures come before antibiotics.
- ✦Femoral neck fractures threaten the femoral head’s blood supply — avascular necrosis is the late complication to name.
Related Resources
Standards & sources
Fact-checked Jun 21, 2026This page is written to align with American Academy of Orthopaedic Surgeons (AAOS) · National Association of Orthopaedic Nurses (NAON). It is an educational summary, not a citation of any single document — always verify specific doses, values, and protocols against current guidelines and your facility policy. How we source content →