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Approach to the Critical Patient
Time critical priorities
Immediate priorities
Hemodynamic instability
Massive hemorrhage alternative source
Polytrauma activation criteria
Limb threat
Absent dorsalis pedis pulse
Absent posterior tibial pulse
Capillary refill delay
Cool pale foot
Rapidly progressive pain
Threatened skin
Skin blanching over talar dome
Tenting
Immediate reduction triggers
Neurovascular compromise
Reduction without imaging delay supported by expert consensus
Post reduction pulse restoration target
Open dislocation
Reduction prioritized after antibiotics when feasible without delaying limb salvage
Irreducible deformity
Urgent orthopedics
Monitoring and access
Continuous pulse oximetry
Supplemental oxygen for hypoxemia
Cardiac monitor when sedation planned
3 lead ECG during procedural sedation
Non invasive blood pressure cycle
Every 3 to 5 minutes during sedation
IV access
Two large bore for high energy trauma
Neurovascular documentation
Pre reduction status
Motor
Deep peroneal nerve ankle dorsiflexion
Superficial peroneal nerve foot eversion
Tibial nerve great toe plantarflexion
Sensory
Deep peroneal first dorsal web space
Superficial peroneal dorsum of foot
Sural lateral foot
Tibial plantar foot
Vascular
Dorsalis pedis pulse
Posterior tibial pulse
Doppler signal when pulses not palpable
Post reduction status
Same nerve and pulse set repeated
Documentation time stamp
Key concepts
Clinical frame
Tibiotalar dislocation usually associated with malleolar fracture
Pure tibiotalar dislocation without fracture rare
Estimated 0.065 percent of all ankle injuries
Estimated 0.46 percent of ankle dislocations
Concomitant tibiotalar dislocation frequency in ankle fractures
Reported 21 to 36 percent of ankle fractures
Time sensitive goals
Restore perfusion
Reduce skin necrosis risk
Restore joint congruity to limit chondral injury
History
Mechanism and context
Injury context
Mechanism
High energy motor vehicle collision
Fall from height
Sports twisting with plantarflexion inversion
Time since injury
Time since deformity noted
Prior reduction attempts
Field attempt details
Open wound concern
Contamination soil or water
Baseline function
Ambulation baseline
Prior ankle instability
Risk modifiers
Diabetes
Peripheral vascular disease
Neuropathy
Tobacco use
Chronic steroids
Osteoporosis history
Medications
Anticoagulants
Antiplatelets
Red flags and associated injuries
Limb threat symptoms
Numbness
Distribution mapping
Weakness
Foot drop
Cold foot
Perfusion change
Pain out of proportion
Compartment syndrome concern
Co injury screen
Knee pain
Maisonneuve pattern concern
Midfoot pain
Lisfranc concern
Hindfoot pain
Subtalar dislocation concern
Back or head injury symptoms
Polytrauma pathway
Physical Exam
Focused ankle and limb exam
Inspection
Deformity direction
Posterior
Anterior
Medial
Lateral
Skin integrity
Open wound
Blanching
Tenting
Fracture blisters
Swelling pattern
Rapid expansion
Palpation
Medial malleolus tenderness
Deltoid injury marker
Lateral malleolus tenderness
Fibular fracture marker
Posterior malleolus tenderness
Posterior malleolar fracture marker
Proximal fibula tenderness
Syndesmosis injury marker
Neurovascular
Pulses
Dorsalis pedis
Posterior tibial
Perfusion
Capillary refill
Skin temperature
Sensation
Deep peroneal first dorsal web space
Superficial peroneal dorsum of foot
Tibial plantar surface
Sural lateral foot
Motor
Tibialis anterior
Extensor hallucis longus
Gastrocnemius soleus
Tendon checks
Achilles integrity
Palpable gap
Thompson test when tolerated
Compartment screen
Pain with passive toe motion
Deep posterior concern
Tense compartments
Leg compartment exam
Pain trajectory
Increasing despite immobilization
PITFALLS
Common misses
Failure to repeat neurovascular exam after reduction and splinting
Documentation risk
Unrecognized syndesmosis injury
Proximal fibula tenderness
Overlooking subtalar dislocation
Hindfoot malalignment
Underestimating open wound
Small puncture counts as open until proven otherwise
Differential Diagnosis
Traumatic differentials
Structural injuries
Ankle fracture dislocation
ICD 10 S82 series
Subtalar dislocation
ICD 10 S93.3
Talus fracture
Talar neck
Talar body
Pilon fracture distal tibia
High energy axial load
Maisonneuve fracture with syndesmosis injury
Proximal fibula fracture
Lisfranc injury
Midfoot plantar ecchymosis clue
Soft tissue injuries
Achilles rupture
Sudden pop
Complete deltoid ligament rupture
Medial clear space widening
Limb threat and complications
Vascular injury
Posterior tibial artery injury
Dorsalis pedis artery injury
Compartment syndrome leg
ICD 10 T79.A2
Nerve injury
Common peroneal neuropraxia
Tibial nerve injury
Infection risk
Open joint contamination
Laboratory Tests
Minimal labs for isolated closed injury
Lab strategy
No routine labs when isolated closed dislocation and stable
Shared decision based on sedation need
Labs when indicated
Procedural sedation pathway
Point of care glucose for altered mental status risk
Hypoglycemia exclusion
Pregnancy test when applicable
Imaging planning
Open injury or operative pathway
Complete blood count for infection baseline and anemia
Leukocytosis limited specificity in acute trauma
Basic metabolic panel for renal function and electrolytes
Contrast readiness if CT angiography considered
Coagulation studies for anticoagulant use or bleeding concern
INR goal context for reversal planning
Type and screen for major trauma
Massive transfusion readiness
Rhabdomyolysis or crush concern
Creatine kinase
Trend for compartment syndrome adjunct
Creatinine and potassium
Acute kidney injury risk
Diagnostic Tests
Scoring Systems
Classification and decision support
Gustilo Anderson open fracture classification when associated fracture and open wound
Type I wound less than 1 cm clean
Type II wound 1 to 10 cm without extensive soft tissue damage
Type IIIA extensive soft tissue laceration with adequate coverage
Type IIIB extensive soft tissue loss with periosteal stripping
Type IIIC arterial injury requiring repair
Danis Weber fibular fracture pattern when fracture dislocation present
Type A below syndesmosis
Type B at syndesmosis
Type C above syndesmosis
Lauge Hansen mechanism patterns when fracture pattern present
Supination external rotation
Pronation external rotation
Supination adduction
Pronation abduction
Open dislocation risk frame
Higher infection risk with gross contamination
Orthoplastic involvement triggers for large soft tissue loss
Radiographs
Imaging set
Ankle 3 view series
AP
Lateral
Mortise
Tibia fibula full length when syndesmosis injury suspected
Proximal fibula fracture detection
Foot series when midfoot pain
Lisfranc concern
Post reduction radiographs mandatory
Confirm congruent tibiotalar joint
Confirm fracture alignment
Imaging delay exception
Neurovascular compromise
Reduction not delayed for x ray per NCBI Bookshelf StatPearls
MRI
Soft tissue and occult injury
Persistent pain with normal radiographs
Osteochondral lesion talar dome
Suspected syndesmotic disruption with equivocal x ray
Ligament complex delineation
Chronic instability planning
ATFL CFL assessment
Contraindications
Non MRI compatible implanted device
Timing
Typically outpatient after acute stabilization
CT
Advanced imaging indications
Intra articular fracture suspicion
Pilon fracture pattern
Talar fracture suspicion
Subtle talar body fracture
Post reduction incongruity on x ray
Entrapped fragment
Vascular injury concern
CT angiography lower extremity
Absent pulses after reduction
Surgical planning
Comminution mapping
Disposition
ED disposition pathways
Discharge criteria
Successful reduction
Stable mortise on post reduction imaging
Intact neurovascular exam
Pain controlled with oral regimen
No escalating opioid requirement
Safe mobility
Crutches or walker training
Non weight bearing plan
Reliable follow up
Orthopedics within 24 to 72 hours for fracture dislocation
Admission criteria
Open dislocation
IV antibiotics ongoing
OR debridement planning
Neurovascular compromise
Persistent pulse deficit
Irreducible dislocation
Operative reduction requirement
Unstable fracture pattern
Trimalleolar fracture dislocation
Compartment syndrome concern
Serial exams or pressure monitoring
Inability to mobilize safely
Social support limitations
Transfer criteria
Vascular repair capability needed
Suspected Type IIIC open fracture
Orthoplastic requirement
Large soft tissue loss
Pediatric growth plate complexity
Pediatric ortho availability
Follow up and immobilization plan
Follow up timing
Fracture dislocation
Orthopedics 24 to 72 hours
Pure dislocation after stable reduction
Orthopedics 3 to 7 days
Activity status
Non weight bearing until specialist review
Exceptions only per orthopedics
Elevation plan
Above heart as much as possible first 48 to 72 hours
Treatment
Immediate life-saving interventions
Limb salvage priorities
If pulseless foot then immediate reduction
If pulses not restored then vascular surgery escalation
If hard signs of vascular injury then CT angiography or OR per local protocol
If open dislocation then antibiotics and tetanus pathway without delaying reduction
Sterile saline soaked dressing
Gross contamination control
If compartment syndrome concern then emergent ortho consultation
Fasciotomy readiness
Pain control and sedation readiness
Airway risk screen
ASA class
Difficult airway predictors
Monitoring setup for sedation
Capnography adjunct
ACEP procedural sedation clinical policy Level B capnography may detect hypoventilation earlier
Fasting status
ACEP procedural sedation clinical policy Level B no delay based on fasting time
Immobilization and Splinting
Splint selection
Posterior short leg plus stirrup for most ankle dislocations after reduction
Neutral dorsiflexion position
Posterior short leg alone when stirrup not available
Added padding over malleoli
Posterior long leg when instability persists
Knee flexion to relax gastrocnemius
Immobilization principles
Swelling phase avoidance of circumferential cast
Compartment and skin risk
Elevation and ice adjunct
Neurovascular recheck after elevation
Post splint neurovascular reassessment
Motor sensory pulses documented
Splint complications mitigation
Two finger tightness check at proximal and distal wrap
Loosen and rewrap if pain increases
Pressure point prevention
Extra padding at malleoli and heel
Reduction
Indications for reduction
Neurovascular compromise
Immediate attempt without imaging delay
Threatened skin
Blanching and tenting resolution target
Fracture dislocation
Articular congruity restoration target
Contraindications or caution triggers
Suspected vascular injury with hard signs
Parallel vascular surgery activation
Suspected physeal injury
Gentle technique
Vertical medial malleolus fracture pattern
Higher failure risk with some maneuvers
Analgesia and anesthesia options
Non opioid adjuncts
Acetaminophen PO 1000 mg once
Ibuprofen PO 400 mg once
Opioid titration
Fentanyl IV 0.5 to 1 mcg per kg
Repeat 0.5 mcg per kg every 5 minutes as needed
Hold for hypoventilation
Regional anesthesia
Intra articular tibiotalar block
Lidocaine 1 percent 10 mL
Aspiration for hemarthrosis before injection
Popliteal sciatic block when trained personnel available
Ultrasound guidance
Procedural sedation
Ketamine IV 1 to 2 mg per kg
Supplemental dose 0.5 mg per kg
Repeat every 5 to 10 minutes as needed
Propofol IV 0.5 to 1 mg per kg
Supplemental dose 0.25 to 0.5 mg per kg
Repeat every 2 to 3 minutes as needed
Etomidate IV 0.1 to 0.2 mg per kg
Limited analgesia
Pair with opioid if needed
Monitoring
Continuous capnography
ACEP Level B recommendation for adjunct monitoring during ED procedural sedation
Immediate airway equipment available
Bag valve mask
Suction
Oral airway
Endotracheal intubation setup
Technique principles
Traction and countertraction
Inline longitudinal traction on foot
Countertraction at distal tibia
Deformity exaggeration then reverse
Disengage talus from mortise
Posterior dislocation common pattern
Plantarflexion relief with dorsiflexion during traction
Gentle sustained force
Avoid repeated forceful attempts
Post reduction requirements
Immediate neurovascular recheck
Pulses and Doppler if needed
Post reduction imaging
Mortise congruity
Immobilization in stable position
Posterior short leg plus stirrup
If persistent instability then urgent orthopedics
Temporary external fixation consideration
Failed reduction pathway
If irreducible then urgent orthopedics
Interposed tendon or fracture fragment concern
If persistent pulse deficit after reduction then vascular escalation
CT angiography consideration
If increasing pain and tense compartments then compartment syndrome escalation
Emergent fasciotomy pathway
Open fracture medications and timing
Open injury pathway
Antibiotics timing
IV prophylactic antibiotics as soon as possible
Ideally within 1 hour of injury per BOAST 4
Within 1 hour of presentation strongly recommended per ACS TQIP orthopedic trauma guidelines
Antibiotic selection examples
Gustilo type I or II
Cefazolin IV 2 g
Repeat every 8 hours
Gustilo type III or gross contamination
Cefazolin IV 2 g
Gentamicin IV 5 mg per kg once daily
Severe beta lactam allergy
Clindamycin IV 900 mg
Repeat every 8 hours
Farm soil or fecal contamination concern
Add penicillin G IV 4 million units
Repeat every 4 hours
Tetanus prophylaxis
Unknown or incomplete immunization
Tetanus vaccine
Tetanus immune globulin for high risk wound
Up to date immunization
Booster based on wound type and time since last dose
Wound handling
Sterile saline soaked dressing
Avoid aggressive ED irrigation when definitive OR planned
Reduce and splint after dressing when feasible
Operative timing frame
Debridement and irrigation as soon as reasonable
Ideally before 24 hours per AAOS major extremity trauma surgical site infection guideline
DVT prophylaxis when relevant
Risk assessment
Lower limb immobilization
Prolonged non weight bearing
Additional risk factors
Prior venous thromboembolism
Active cancer
Estrogen therapy
Obesity
Strategy alignment
Local protocol based on fracture pattern and operative plan
Ortho directed prophylaxis preferred
Contraindications
Active bleeding
High bleeding risk
Special Populations
Pregnancy
Pregnancy considerations
Imaging choice
Radiographs acceptable when indicated
Abdominal shielding when feasible
Analgesia selection
Acetaminophen preferred
NSAID avoidance in later pregnancy
Sedation considerations
Aspiration risk higher
Left lateral tilt positioning when feasible
Obstetric coordination
Viable gestation fetal monitoring per local protocol
Geriatric
Geriatric considerations
Fragility mechanism
Low energy twist common in ankle fractures
Skin and soft tissue fragility
Higher blister and necrosis risk
Delirium risk with opioids and sedation
Lowest effective dose strategy
Mobility and discharge planning
Higher admission threshold when unsafe non weight bearing
Pediatrics
Pediatric considerations
Physeal injury risk
Salter Harris patterns with ankle trauma
Reduction technique
Gentle traction
Avoid repeated attempts
Analgesia dosing weight based
Ketamine IV 1 to 2 mg per kg
Fentanyl IV 1 mcg per kg
Non accidental trauma screen when appropriate
Inconsistent history
Multiple injuries
Background
Epidemiology
Frequency and patterns
Pure ankle dislocation without fracture rare
Estimated 0.065 percent of all ankle injuries
Estimated 0.46 percent of ankle dislocations
Tibiotalar dislocation association with ankle fractures
Reported 21 to 36 percent of ankle fractures
Adult ankle fracture incidence context
Reported 179 per 100000 persons per year in one population study
Pathophysiology
Mechanism and anatomy
Mortise stability
Ligament complex often stronger than malleolar bone
Fracture occurs instead of pure dislocation in many cases
Common displacement direction
Posterior dislocation with plantarflexion and axial load
Injury components
Deltoid ligament disruption
Syndesmosis disruption
Osteochondral talar dome injury risk
Complication mechanisms
Skin necrosis from talar pressure
Vascular compromise from stretch or kinking
Chondral injury from incongruity
Therapeutic Considerations
Rationale for urgent reduction
Perfusion restoration
Ischemia time reduction
Skin protection
Reduce tenting and blanching
Cartilage protection
Minimize time out of joint congruity
Immobilization rationale
Protect disrupted ligaments and fractures
Prevent redislocation
Swelling phase risk
Avoid circumferential cast early
Operative versus nonoperative drivers
Unstable fracture pattern
Operative fixation common
Open injury
Debridement and stabilization
Syndesmosis instability
Screw or suture button fixation
Evidence framing
Early antibiotics in open fractures reduces infection
BOAST and ACS TQIP recommend within 1 hour
ED procedural sedation practice guidance
ACEP procedural sedation clinical policy Level B no delay for fasting
ACEP procedural sedation clinical policy Level B capnography as adjunct
Patient Discharge Instructions
Copy discharge instructions
Discharge instructions
Splint care
Keep splint clean and dry
Do not insert objects to scratch
Swelling control
Elevation above heart as much as possible first 48 to 72 hours
Ice 15 to 20 minutes at a time with skin protection
Weight bearing
Non weight bearing until orthopedics follow up
Crutches or walker use as taught
Pain plan
Acetaminophen as directed on label
Ibuprofen as directed on label if safe for patient
Opioid only if prescribed
Wound care for open injury
Keep dressing intact
Antibiotics exactly as prescribed
Return to ED now
Increasing pain not controlled by medication
New numbness or tingling
Toes cold pale or blue
Increasing tightness in calf or foot
Splint too tight or painful pressure point
Splint wet broken or slipping
Fever or foul drainage from wound
Follow up
Orthopedics appointment timing provided
Return earlier if symptoms worsen
References
Core sources and guidelines
References
NCBI Bookshelf StatPearls Ankle Dislocation imaging should not delay reduction when neurovascular compromise suspected
Emphasizes early reduction and neurovascular assessment
BOAST 4 Open Fractures 2017 IV prophylactic antibiotics as soon as possible ideally within 1 hour of injury
Orthoplastic transfer principles for complex open injuries
ACS TQIP Orthopaedic Trauma Guidelines broad spectrum IV antibiotics within 1 hour of presentation for open fractures
Sterile dressing recommendation
AAOS Prevention of Surgical Site Infections After Major Extremity Trauma guideline debridement and irrigation ideally before 24 hours
Quality of evidence moderate
ACEP Clinical Policy Procedural Sedation and Analgesia in the ED 2014 Level B no delay based on fasting time
Supports ED based procedural sedation practice
ACEP Clinical Policy Procedural Sedation and Analgesia in the ED 2014 Level B capnography may be used as adjunct to detect hypoventilation
Monitoring enhancement during sedation
Pure ankle dislocation epidemiology report pure dislocation incidence 0.065 percent of ankle injuries and 0.46 percent of ankle dislocations
Highlights rarity and frequent association with fracture
Review of ankle fracture dislocations reports concomitant tibiotalar dislocation in 21 to 36 percent of ankle fractures
Supports high suspicion for fracture dislocation
Epidemiology study adult ankle fractures incidence 179 per 100000 persons per year
Context for common fracture co injury
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