A 28-year-old warehouse worker sits on the edge of the stretcher, one boot cut away, the room filled with the smell of wet asphalt and sweat. His ankle is swollen beneath the lateral malleolus, and every attempt to move it produces a sharp, deep pain. He can wiggle his toes, but says the foot feels “tight.” The radiographs are not yet available, and the next decision has not been made.

— What’s your move? Read on.

Before you read
  • When can the Ottawa Ankle Rules safely exclude a fracture?
  • Which radiographic pattern predicts instability and orthopedic intervention?

When to Think of It

Consider fracture with malleolar tenderness, inability to bear weight for four steps, deformity, swelling, ecchymosis, or pain over the posterior malleoli, talar dome, base of the fifth metatarsal, or navicular. Apply Ottawa Ankle Rules only in an alert, reliable patient: ankle radiographs for malleolar-zone pain plus posterior-edge/tip tenderness of either malleolus or inability to bear weight both immediately and in the ED; foot films for midfoot pain plus navicular or fifth-metatarsal-base tenderness or inability to bear weight.

Sick or Not Sick

The key call is stable injury versus fracture-dislocation or threatened soft tissue/neurovascular compromise. Document pulses, capillary refill, sensation, motor function, skin tenting, and open wounds before and after every manipulation.

The First Fifteen Minutes

  • Any severe pain: acetaminophen 1,000 mg PO, because it provides opioid-sparing analgesia; avoid exceeding 4,000 mg/day, or 3,000 mg/day in many older adults, liver disease, or heavy alcohol use.
  • Moderate-to-severe pain: ketorolac 15 mg IV or 30 mg IM once, because prostaglandin reduction treats inflammatory pain; avoid in significant renal disease, active GI bleeding, anticoagulation with high bleeding risk, or pregnancy.
  • Severe pain despite nonopioid therapy: fentanyl 50–100 mcg IV, repeated every 5 minutes in small titrated doses, because rapid analgesia permits examination and reduction; monitor ventilation and blood pressure.
  • Deformity, skin tenting, absent pulse, or fracture-dislocation: perform urgent reduction with appropriate analgesia and sedation; for a cooperative adult, lidocaine 1% without epinephrine, 10–20 mL intra-articular or as a hematoma block, because local sodium-channel blockade interrupts pain transmission. Maximum dose is generally 4.5 mg/kg plain lidocaine; verify institutional limits.
  • Reduction requiring dissociation: ketamine 1 mg/kg IV, with 0.25–0.5 mg/kg IV repeat doses as needed, because dissociative analgesia preserves spontaneous respiration; use continuous monitoring and airway readiness. Dosing varies by protocol—check institutional sedation guidance.
  • Open fracture: cefazolin 2 g IV now, because early gram-positive coverage reduces infection risk; add broader gram-negative/anaerobic coverage according to wound severity and institutional open-fracture protocol. Update tetanus: Tdap 0.5 mL IM if vaccination is incomplete/unknown or a booster is due; add tetanus immune globulin 250 units IM for dirty wounds with unknown or incomplete primary vaccination.

Definitive Care & Disposition

Obtain AP, lateral, and mortise radiographs; add tibia/fibula films when proximal fibular tenderness suggests a Maisonneuve injury. Post-reduction films are mandatory. Stable, nondisplaced isolated fractures may receive a short-leg posterior splint or boot, crutches, elevation, and orthopedic follow-up; avoid circumferential casting during major swelling. Admit or obtain urgent orthopedic management for open fracture, threatened skin, neurovascular compromise, irreducible dislocation, compartment syndrome, unstable syndesmotic injury, posterior malleolar involvement with instability, or inability to safely ambulate/follow up.

How This One Kills

The classic failure is treating an ankle fracture-dislocation as a routine sprain while the talus remains displaced, allowing skin necrosis, neurovascular injury, and worsening cartilage damage.
The Differential — What Else Looks Like This
  • Ankle sprain — ligamentous tenderness is usually anterior/inferior to the malleoli rather than directly over the posterior malleolar edges; confusing them leads to missed unstable fracture.
  • Achilles rupture — palpable tendon gap or positive Thompson test, not malleolar bony tenderness; missing it causes delayed functional loss.
  • Talar dome fracture — persistent deep ankle pain with initially subtle radiographs; dismissing it as a sprain delays diagnosis.
  • Compartment syndrome — escalating pain with passive stretch and tense compartments, often out of proportion; confusing it with routine fracture pain risks limb loss.

The Second-Day Story

Older adults, neuropathy, intoxication, and low-energy falls may produce little pain despite a displaced fracture. Anticoagulation may magnify swelling, while diabetes and peripheral vascular disease can make pulses difficult to interpret. Do not let preserved pulses exclude a dangerous deformity: inspect the skin, compare sensation and temperature, obtain appropriate views, and reassess after immobilization.
Back to Our Patient
Back to the 28-year-old warehouse worker: his deformity, marked swelling, and skin tenting make this an unstable fracture-dislocation until proven otherwise, despite preserved toe movement. After documenting intact pulses and sensation, he receives titrated analgesia and procedural sedation, followed by urgent reduction and a well-padded posterior splint with repeat neurovascular examination. Radiographs show an unstable bimalleolar fracture-dislocation; post-reduction alignment improves, but orthopedic surgery is consulted for operative management. He is admitted rather than discharged because the injury is unstable and swelling threatens the soft tissues.
Patient Presentation to Attending
How you’d present this patient on the floor — tight, pertinent positives and negatives, no rambling
“This is a 28-year-old previously healthy warehouse worker with an acute deformity and severe pain after a twisting fall on wet asphalt. He has marked swelling and skin tenting over the ankle, with tenderness over both malleoli, but no open wound, preserved toe movement, palpable dorsalis pedis pulse, and intact sensation. I am concerned for an unstable ankle fracture-dislocation rather than an isolated sprain. I gave analgesia, placed him on monitoring, and recommend urgent reduction under procedural sedation followed by repeat neurovascular examination and post-reduction films. I anticipate orthopedic admission because of the deformity and likely unstable fracture pattern.”

Study Directive

  • From memory, list every Ottawa Ankle Rule trigger and its limitations.
  • Review three ankle radiographs and identify medial clear-space widening, syndesmotic widening, posterior malleolar involvement, and talar shift.
  • Practice a verbal pre- and post-reduction neurovascular examination.
  • Review your institution’s procedural sedation and open-fracture antibiotic protocols.

Recent Literature

  • Review or guideline Current Concepts in Ankle Fracture Management
    Patel S, Dionisopoulos SB · Clin Podiatr Med Surg, 2024 · PMID 38789168 · cited 12×
    A practical overview of fracture classification, stability assessment, reduction, immobilization, and operative indications to guide initial ED management and orthopedic disposition.