Open Tibial Shaft Fracture With Evolving Compartment Syndrome
A 34-year-old male bicycle commuter was struck by a car turning right and arrived by ambulance at 19:10. He has a 4 cm jagged wound over the anterior tibial crest at the midshaft with exposed bone and visible road debris, and no active bleeding. He is alert with a Glasgow Coma Scale of 15, heart rate 108 beats/min, blood pressure 132/80 mmHg, and pain 8/10. Distal pulses are 2+ by Doppler, capillary refill is under 2 seconds, and the ankle-brachial index is 0.95. Sensation in the first web space is intact and he can dorsiflex and plantarflex against resistance, though it is painful. Radiographs show a transverse midshaft tibia fracture with 1 cm of lateral displacement and an intact fibula; the trauma survey identifies no other injuries. His last tetanus booster was 12 years ago and he is unsure whether he completed the childhood series. He is otherwise healthy and takes no medications. The operating room is available at 23:30.
1. Classify the injury and outline your emergency department management, including antibiotics, tetanus, and the timing of debridement.
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This is an open tibial shaft fracture. By Gustilo-Anderson, a wound larger than 1 cm with exposed bone and moderate contamination, without a repairable arterial injury, is at least type II; the periosteal stripping and degree of contamination here make type IIIA the safer working classification. Classification can be upgraded intraoperatively after debridement, so photograph and document the wound rather than committing irrevocably in the emergency department.
Priorities: nothing by mouth, IV access, analgesia, tetanus assessment, antibiotics, provisional stabilization, and a sterile dressing.
Antibiotics within one hour: cefazolin 2 g IV plus gentamicin 5 mg/kg once daily for a type III wound; add penicillin G or ampicillin if there is soil, farm, or water contamination to cover Clostridium. For penicillin allergy, use clindamycin plus gentamicin (some protocols use vancomycin).
Tetanus: unknown or incomplete primary series with a contaminated wound means both tetanus toxoid and tetanus immune globulin; a booster 12 years ago does not cover a contaminated wound if the primary series is incomplete.
Debridement: the 23:30 slot is acceptable. The old 6-hour rule is not evidence-based, but earlier is better; target debridement within 24 hours and as soon as feasible. Do not close the wound primarily. Splint, elevate, and monitor.
2. At 03:00 the next morning, after intramedullary nailing, he reports pain 9/10, the anterior compartment is tense, passive toe extension is painful, and sensation between the first and second toes is reduced. Compartment pressure is 34 mmHg with a diastolic pressure of 62 mmHg. Interpret these findings and state your actions.
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This is compartment syndrome of the anterior compartment. The findings are clinical: pain out of proportion, a tense compartment, pain with passive stretch, and the earliest sensory change, decreased sensation in the first dorsal web space, which is deep peroneal nerve territory.
The pressure of 34 mmHg with a diastolic pressure of 62 mmHg gives a delta pressure of 28 mmHg, below the 30 mmHg threshold. That supports fasciotomy but does not establish the diagnosis on its own; the clinical picture is the primary driver.
Action: emergent fasciotomy of all four compartments through two incisions (anterolateral and posteromedial), releasing both fascia and skin, not just the anterior compartment. Notify the attending, keep the leg at heart level rather than elevated, remove constricting dressings, and keep him NPO. Do not wait for a repeat measurement or for pulselessness.
Caveats: the admission ABI of 0.95 is mildly reduced but does not exclude compartment syndrome, and pulses are usually preserved until the process is advanced. After fasciotomy, plan for negative-pressure wound therapy, return to the operating room in 48-72 hours, and delayed closure or split-thickness grafting. Document neurovascular status before and after.
3. Outline the wound coverage plan, expected bone healing, prophylaxis, and the return-to-work education you give him before discharge.
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Wound and coverage: after fasciotomy the wounds stay open, managed with negative-pressure wound therapy, with return to the operating room every 48-72 hours for debridement. Soft tissue coverage should occur within about 7 days, ideally by day 3-5, once the wound is clean; later coverage increases deep infection and flap failure. Consult plastic surgery early rather than after weeks.
Bone: an intramedullary nail provides stable fixation, though a heavily contaminated wound may favor an external fixator with conversion to a nail once soft tissues are clean. Healing takes 4-6 months. The intact fibula protects against shortening but can contribute to delayed tibial union.
Prophylaxis and monitoring: LMWH for DVT prophylaxis while non-weight-bearing; teach him the signs of infection (fever, increasing pain, drainage, wound breakdown) and of compartment syndrome recurrence. Smoking cessation matters, as smoking substantially increases nonunion and flap failure.
Return to work: no driving while splinted or taking opioids; desk work may resume in 2-6 weeks; heavy manual work, prolonged standing, and cycling typically take 4-6 months. Discuss the realistic risks of nonunion, infection, and possible bone grafting, and give written return precautions.