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Approach to the Critical Patient
Triage and immediate threats
Immediate stabilization priorities
Airway compromise or altered mental status
Hemodynamic instability
Open injury with uncontrolled bleeding
Gross deformity suggesting fracture-dislocation
Rapidly evolving neurovascular deficit
Pain out of proportion with tense swelling
Limb threat checkpoints
Distal pulses
Capillary refill
Skin color and temperature
Sensation
Motor function
If pulseless or cool foot, immediate reduction if dislocated, emergent orthopedics and vascular
Compartment syndrome triggers
Pain with passive stretch
Progressive pain despite analgesia
Tense compartments
Paresthesia or weakness
If suspected, emergent orthopedics
Key decision points
Imaging need determination
Ottawa Ankle Rules pathway for radiographs
Immediate radiographs for gross deformity or fracture-dislocation
Post-reduction radiographs after any reduction attempt
Instability and high-risk patterns
Suspected syndesmotic injury
Suspected deltoid injury with medial clear space concern
Inability to bear weight beyond initial period
High-energy mechanism
History
Injury context
Symptom timeline
Time of injury
Immediate swelling onset
Ability to bear weight immediately after injury
Ability to bear weight in ED
Mechanism pattern
Inversion and plantarflexion
Eversion
External rotation
Axial load or fall from height
Location of pain
Lateral malleolus region
Medial malleolus region
Anterior ankle
Proximal fibula pain
Midfoot pain at navicular
Base of 5th metatarsal pain
Functional impact
Walking limitation
Sport-specific limitations
Prior sprains or instability
Associated injury clues
Audible pop
Locking or catching
Numbness or weakness
Wound or foreign body risk
Patient risk modifiers
Bleeding and healing risks
Anticoagulant or antiplatelet therapy
Bleeding disorder
Bone and connective tissue risks
Osteoporosis risk factors
Chronic glucocorticoid use
Prior ankle surgery or hardware
Infection risk
Diabetes
Immunosuppression
Physical Exam
Inspection and palpation
Baseline observations
Swelling distribution
Ecchymosis pattern
Ability to bear weight
Gait if able
Bony tenderness map
Posterior edge or tip of lateral malleolus
Posterior edge or tip of medial malleolus
Navicular
Base of 5th metatarsal
Proximal fibula
Soft tissue tenderness map
Anterior talofibular ligament region
Calcaneofibular ligament region
Posterior talofibular ligament region
Deltoid ligament region
Syndesmosis over anterior inferior tibiofibular ligament
Skin integrity
Abrasion or laceration
Fracture blisters
Threatened skin from deformity
Neurovascular and function
Neurovascular status
Dorsalis pedis pulse
Posterior tibial pulse
Capillary refill
Sensation in superficial peroneal distribution
Sensation in deep peroneal distribution
Sensation in tibial distribution
Motor function
Ankle dorsiflexion
Great toe extension
Ankle plantarflexion
Foot eversion and inversion strength
Stability maneuvers and special tests
Lateral ligament testing
Anterior drawer
Talar tilt
Test limitation in acute pain and guarding
Syndesmosis evaluation
Squeeze test
External rotation stress symptom reproduction
Pain over syndesmosis with dorsiflexion
Deltoid injury clues
Medial tenderness
Medial swelling or ecchymosis
PITFALLS
Subtle fractures with predominant ligament pain
Lateral malleolar avulsion
Osteochondral talar dome lesion
Base of 5th metatarsal fracture
Navicular fracture
Maisonneuve pattern miss risk
Proximal fibula tenderness with ankle injury
Syndesmotic pain with minimal ankle swelling
Missed open injury
Small puncture over malleoli
Contamination from sports field or gravel
Differential Diagnosis
Traumatic differentials
Fracture patterns
Lateral malleolus fracture
ICD-10 S82.6-
Medial malleolus fracture
ICD-10 S82.5-
Posterior malleolus fracture
Talus fracture
Calcaneus fracture
Base of 5th metatarsal fracture
Navicular fracture
Maisonneuve fracture with syndesmotic disruption
Dislocations and subluxations
Ankle fracture-dislocation
Subtalar dislocation
Soft tissue injuries
Lateral ankle ligament sprain
ICD-10 S93.40-
SNOMED CT concept: Sprain of ankle ligament
Syndesmotic sprain
ICD-10 S93.43-
Deltoid ligament sprain
Achilles tendon rupture
Peroneal tendon subluxation or tear
Non-fracture mimics and complications
Osteochondral lesion of the talus
Ankle septic arthritis in atypical presentations
Cellulitis after abrasion
Deep vein thrombosis in immobilization context
Laboratory Tests
When indicated
Targeted labs only
No routine labs for isolated uncomplicated sprain
Pregnancy test for imaging decision-making when pregnancy possible
Coagulation studies for anticoagulant use with large hematoma concern
Infection labs for suspected septic arthritis or cellulitis
Infection evaluation
CBC for systemic infection concern
CRP for inflammatory or septic concern
Blood cultures for systemic toxicity
Procedural pathway labs
Pre-op labs only if fracture-dislocation or operative fracture suspected
Interpretation pearls
Large swelling and ecchymosis
Poor correlation with fracture presence
Higher suspicion for higher-grade ligament injury
Normal inflammatory markers
Does not exclude early septic arthritis
Diagnostic Tests
Scoring Systems
Ottawa Ankle Rules
Ankle radiograph criteria
Pain in malleolar zone
Bone tenderness at posterior edge or tip of lateral malleolus
Bone tenderness at posterior edge or tip of medial malleolus
Inability to bear weight immediately and for 4 steps in ED
Foot radiograph criteria
Pain in midfoot zone
Bone tenderness at navicular
Bone tenderness at base of 5th metatarsal
Inability to bear weight immediately and for 4 steps in ED
Diagnostic performance
Sensitivity range reported approximately 96.4% to 99.0% for clinically significant fractures
Radiograph reduction potential approximately 30% to 40%
Limitations
Less reliable with intoxication or distracting injuries
Not designed for chronic injuries
Consider imaging despite negative rule if high-energy mechanism or clinician concern
Radiographs
Standard ankle radiographs
3-view series
AP view
Lateral view
Mortise view
Post-reduction radiographs after any reduction
Foot radiographs when midfoot criteria present
3-view foot series
Proximal fibula radiographs when Maisonneuve concern
Tibia-fibula films including knee and ankle
Radiograph interpretation targets
Medial clear space concern for deltoid injury
Tibiofibular clear space concern for syndesmotic injury
Avulsion fragments at malleoli or talus
MRI
Indications
Persistent pain or swelling beyond expected course
Suspected osteochondral lesion
Suspected tendon injury
Suspected high-grade syndesmotic injury with equivocal radiographs
Utility
Ligament grading and associated cartilage injury
Occult fracture detection
CT
Indications
Suspected occult fracture with negative radiographs and high clinical concern
Complex fracture pattern for surgical planning
Suspected talar or intra-articular injury
Considerations
Radiation minimization
Pregnancy risk-benefit discussion when applicable
Disposition
Discharge versus admission
Discharge criteria
Stable vitals
No open injury
No neurovascular deficit
No fracture-dislocation
Pain controlled with oral regimen
Safe ambulation plan with support device if needed
Admission or urgent specialist criteria
Suspected compartment syndrome
Neurovascular compromise
Open fracture or open joint concern
Unstable fracture on imaging
Suspected Maisonneuve fracture
Suspected significant syndesmotic disruption with instability
Inability to mobilize safely despite support
Follow-up timing
Routine sprain follow-up
Primary care, sports medicine, or physiotherapy
3 to 7 days for reassessment and rehab initiation if severe pain or swelling
Fracture clinic or orthopedics follow-up
3 to 7 days for stable fractures or suspected instability
Earlier reassessment triggers
Worsening pain or swelling
New numbness or weakness
Inability to bear weight after initial improvement
Treatment
Immediate life-saving interventions
Threatened limb or severe injury pathway
If fracture-dislocation with neurovascular compromise, immediate reduction then splint
If open fracture suspected, initiate antibiotics and tetanus pathway then urgent orthopedics
If compartment syndrome concern, emergent orthopedics
Immobilization and Splinting
Immobilization choices
Posterior short leg splint
Severe pain or inability to bear weight
Stirrup splint
Moderate sprain with lateral instability symptoms
Posterior short leg plus stirrup
Significant swelling with need for added stability
Walking boot
Functional support with early weight-bearing as tolerated
Lace-up ankle brace
Mild to moderate sprain with early mobilization plan
Immobilization principles
Swelling-phase avoidance of circumferential casting
Neutral ankle position
Recheck neurovascular status after application
Crutches or cane plan aligned with weight-bearing status
Reduction
Reduction pathway when deformity present
Indications
Fracture-dislocation
Threatened skin
Neurovascular compromise
Analgesia and anesthesia options
Oral and parenteral analgesia
Acetaminophen PO 1000 mg once
Maximum 4000 mg per 24 hours
Ibuprofen PO 400 mg once
Repeat every 6 to 8 hours as needed
Maximum 2400 mg per 24 hours
Naproxen PO 500 mg once
Repeat 250 to 500 mg every 12 hours as needed
Maximum 1000 mg per 24 hours
Procedural sedation when required
Continuous monitoring
Cardiac monitor
Rhythm and rate targets per local protocol
Pulse oximetry
Oxygen saturation trend
Capnography
Ventilation trend
Airway readiness
Suction setup
Bag-valve-mask
Rescue airway devices
Technique principles
Traction and countertraction
Deformity exaggeration then reverse mechanism as appropriate
Gentle sustained force
Avoid repeated forceful attempts
Post-reduction requirements
Immediate neurovascular re-check
Post-reduction radiographs
Immobilization in stable position
Failed reduction pathway
If persistent neurovascular deficit, immediate orthopedics and vascular
If irreducible, urgent orthopedics
Open fracture medications and timing
Open injury pathway when suspected
Antibiotics
Cefazolin IV 2 g once
Repeat every 8 hours if ongoing inpatient care
If severe beta-lactam allergy, clindamycin IV 900 mg once
Repeat every 8 hours if ongoing inpatient care
Tetanus prophylaxis
If unknown or incomplete immunization and dirty wound, tetanus immune globulin plus vaccine per local protocol
If immunization up to date, booster timing per local protocol
Wound management basics
Sterile dressing
Gross contamination removal without aggressive probing
Urgent orthopedics
DVT prophylaxis when relevant
Lower limb immobilization risk assessment
Prior venous thromboembolism
Active cancer
Major immobility
Hormonal therapy
Pregnancy or postpartum
Local protocol alignment
Pharmacologic prophylaxis per institutional guideline if high risk
Mechanical prophylaxis and mobilization encouragement when appropriate
Symptom control and rehab start
Early functional rehabilitation emphasis
Range of motion progression as pain allows
Strengthening progression
Proprioception and balance training
Acute care options
Protection and optimal loading approach
Ice for short-term analgesia
Compression wrap
Elevation above heart level
Special Populations
Pregnancy
Pregnancy-specific considerations
Imaging selection with radiation minimization
Radiographs when Ottawa criteria met and clinical need outweighs risk
Abdominal shielding per local practice when feasible
Analgesia selection
Acetaminophen preferred first-line
NSAID avoidance in later pregnancy per obstetric guidance
DVT risk context
Lower threshold for VTE risk assessment with immobilization
Geriatric
Older adult considerations
Lower threshold for imaging
Higher fracture risk with low-energy mechanisms
Fall risk mitigation
Mobility aid fitting and safety plan
Medication safety
NSAID renal and GI risk
Opioid delirium and fall risk
Osteoporosis pathway
Fragility fracture evaluation if fracture present
Pediatrics
Pediatric considerations
Physeal injury concern
Low threshold for imaging with localized bony tenderness
Weight-based analgesia
Acetaminophen PO 15 mg/kg per dose
Maximum 75 mg/kg per 24 hours
Ibuprofen PO 10 mg/kg per dose
Maximum 40 mg/kg per 24 hours
Return-to-sport guidance
Balance and proprioception training emphasis
Bracing consideration on return to play
Background
Epidemiology
Frequency and burden
One of the most common sports-related injuries
Lateral ligament complex most commonly involved
Recurrence and chronic instability risk with inadequate rehab
Pathophysiology
Typical injury mechanism
Inversion with plantarflexion stressing anterior talofibular ligament
Progression to calcaneofibular ligament with increasing force
Syndesmotic injury with external rotation and dorsiflexion mechanism
Injury grading concepts
Grade I microtearing with minimal instability
Grade II partial tear with functional instability
Grade III complete rupture with mechanical instability
Complication pathways
Chronic ankle instability
Peroneal tendon injury
Osteochondral talar lesions
Therapeutic Considerations
Early mobilization rationale
Functional rehabilitation supports range of motion and neuromuscular control
Prolonged immobilization increases stiffness risk
Bracing rationale
External support reduces inversion stress during healing
Bracing supports early activity and reduces reinjury risk in return to sport
Anti-inflammatory medication considerations
Short-term NSAIDs for analgesia balanced against GI and renal risks
Avoid NSAIDs in select high-risk patients per comorbidity profile
Patient Discharge Instructions
Copy discharge instructions
Home care plan
Relative rest with gradual return to activity
Compression wrap or brace use as instructed
Elevation above heart level when resting
Ice 10 to 20 minutes per session for pain relief
Weight-bearing plan
Weight-bearing as tolerated if no fracture and pain allows
Crutches until able to walk with minimal limp
Pain control plan
Acetaminophen dosing per label or clinician instructions
NSAID dosing per label or clinician instructions if safe
Rehab plan
Start ankle range of motion when pain allows
Progress to strengthening and balance exercises
Consider physiotherapy referral for moderate to severe sprain or athletes
Return to ED immediately
Increasing pain with tight swelling
New numbness or weakness
Cold, pale, or blue foot or toes
Inability to bear weight that is worsening
Fever or spreading redness after abrasion
Worsening pain after splint or brace application
Follow-up plan
Reassessment in 3 to 7 days if significant swelling, bruising, or difficulty walking
Earlier follow-up for high ankle sprain suspicion or persistent medial pain
References
Clinical guidelines and decision rules
Ottawa Ankle Rules validation summaries and performance ranges
Reported sensitivity range approximately 96.4% to 99.0% for clinically significant fractures
Radiograph reduction potential approximately 30% to 40%
NICE CKS sprains and strains management recommendations
Initial self-management using PRICE for early period
Safe return to usual activities advice
AAOS OrthoInfo ankle sprain guidance
Early functional rehabilitation emphasis
Discontinuation of prolonged immobilization to avoid stiffness
Soft tissue injury management evolution
PEACE and LOVE framework discussion for soft tissue rehabilitation concepts
Evidence-based sources
Systematic and narrative reviews on ankle sprain management and rehabilitation
Functional rehabilitation progression focus
Balance and proprioception retraining importance
ED decision support tools listing Ottawa Ankle Rule usage
Clinical decision rule adoption in emergency care contexts
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.