Browse categories and answer follow-up questions to refine your symptom profile.
History
Presenting context
Context
Acute traumatic injury
Atraumatic onset
Overuse or training change
Occupational exposure
Footwear change
Onset
Onset
Sudden onset during activity
Sudden onset at rest
Gradual onset over days
Onset after minor twist with immediate swelling
Provocation/Palliation
Provocation and palliation
Worse with weight bearing
Worse with stairs
Worse with inversion
Worse with eversion
Relief with rest
Relief with elevation
Quality
Quality
Sharp pain
Dull ache
Deep joint pain
Burning pain
Mechanical catching or locking
Region/Radiation
Region and radiation
Lateral ankle
Medial ankle
Posterior ankle
Anterior ankle
Midfoot pain
Radiating pain up the leg
Severity
Severity
Able to bear weight for 4 steps
Unable to bear weight
Pain limiting sleep
Pain requiring assistive device
Timing
Timing
Constant pain
Intermittent pain
Morning stiffness duration
Progressive worsening over 24 to 48 hours
Associated symptoms
Associated symptoms
Swelling
Ecchymosis
Instability or giving way
Numbness or tingling
Fever or chills
Redness or warmth
Mechanism of injury
Mechanism
Inversion injury
Eversion injury
External rotation
Direct blow
Fall from height
Sports contact
Prior episodes and baseline
Prior episodes and baseline
Prior ankle sprains
Prior fractures
Chronic ankle instability
Baseline mobility and assistive devices
Functional impact
Function
Gait limitation
Work or sport limitation
Driving limitation
Activities of daily living limitation
Alarm Features
Approach to the critical patient
First 5 minutes workflow
Immediate triage to monitored bed if severe pain with deformity
Immediate triage to monitored bed if neurovascular concern
Continuous pulse oximetry if respiratory distress or sedation planned
Cardiac monitor if syncope or hemodynamic instability
Two large bore IV if shock concern or major trauma
Immediate analgesia within 15 minutes if severe pain
Vital sign danger thresholds
Danger thresholds
Systolic blood pressure less than 90 mmHg
Heart rate greater than 120 per minute
Respiratory rate greater than 24 per minute
Oxygen saturation less than 92 percent on room air
Temperature 38.0 C or higher
Limb threat red flags
Limb threat
Absent distal pulses
Cool pale foot
Severe pain out of proportion
Pain with passive toe stretch
Rapidly increasing swelling or tense compartments
New motor weakness
Infection and necrotizing infection red flags
Infection red flags
Fever with hot swollen ankle
Immunocompromised state with acute monoarthritis
Rapidly spreading erythema
Skin bullae
Crepitus
Systemic toxicity
Medications
Current medications and recent changes
Medication inventory
Prescription analgesics
OTC NSAIDs
Acetaminophen exposure
Recent antibiotics
Recent systemic corticosteroids
Recent intraarticular injection
Antithrombotic and bleeding risk medications
Bleeding risk medications
Warfarin
DOACs
Antiplatelets
NSAID plus anticoagulant combination risk
High risk interactions relevant to ankle pain care
Interaction and contraindication checks
NSAID contraindications
Chronic kidney disease risk
Heart failure risk
Pregnancy NSAID trimester cautions
Colchicine interactions
QT prolonging medication overlap if antiemetics used
Diet
Hydration and recent intake
Intake pattern
Low oral intake due to illness
Dehydration risk
Recent vomiting or diarrhea
High sodium intake with edema tendency
Gout relevant exposures
Purine and alcohol exposure
Recent binge alcohol
Beer exposure
High purine meals
Sugary beverage exposure
Bone health nutrition
Bone health
Low calcium intake pattern
Low vitamin D intake pattern
Eating disorder risk pattern
Review of Systems
Musculoskeletal
MSK symptoms
Knee pain
Hip pain
Back pain
Other joint swelling
Morning stiffness
Neurologic and vascular
Neurovascular symptoms
Numbness
Tingling
Weakness
Color change
Claudication symptoms
Infectious and systemic
Systemic symptoms
Fever
Chills
Night sweats
Unintentional weight loss
Recent skin infection
Recent sore throat or diarrhea
Collateral History and Family History
Collateral source and reliability
Collateral
Witnessed mechanism details
Baseline mobility confirmation
Medication list confirmation
Family history relevant to ankle pain
Family history
Gout
Inflammatory arthritis
Early osteoporosis or fragility fractures
Bleeding disorders
Exposure and household context
Exposure context
Sick contacts
Recent travel
Pet or animal exposure
Support for crutch use and safe ambulation
Risk Factors
Trauma and fracture risk
Fracture risk
Age over 65 years
Known osteoporosis
Prior fragility fracture
Chronic glucocorticoid use
High energy mechanism
Intoxication at time of injury
Infection risk for septic arthritis
Septic arthritis risk
Diabetes mellitus (E11.9)
Immunosuppression
Recent bacteremia
Skin breakdown near joint
Recent joint injection
IV drug use
Thrombosis and vascular risk
Vascular and thrombosis risk
Recent immobilization
Prior venous thromboembolism
Active malignancy
Peripheral arterial disease (I73.9)
Smoking
Tendon and ligament injury risk
Soft tissue injury risk
Prior ankle sprain
Hyperlaxity
High demand sport
Poor footwear support
Neuropathy (E11.40)
Differential Diagnosis
Life threatening
Life threatening and limb threatening
Acute compartment syndrome
Disproportionate pain
Pain with passive stretch
Tense compartments
Open fracture or fracture dislocation
Wound communicating with joint or fracture
Gross deformity
Septic arthritis (M00.9)
Hot swollen joint
Fever or systemic toxicity
Necrotizing soft tissue infection
Rapid progression
Severe pain out of proportion
Acute limb ischemia (I74.9)
Pain with pulselessness
Pallor and coolness
Common
Common causes
Lateral ankle sprain
Inversion mechanism
Lateral swelling and ecchymosis
Ankle fracture
Bony tenderness
Inability to bear weight
Achilles tendinopathy
Posterior heel pain
Pain with plantarflexion loading
Posterior tibial tendon dysfunction
Medial pain
Arch collapse tendency
Gout flare (M10.9)
Sudden severe monoarthritis
Prior flares
Less common
Less common and mimics
Syndesmotic injury high ankle sprain
External rotation mechanism
Pain above ankle mortise
Osteochondral lesion of talus
Persistent pain after sprain
Mechanical symptoms
Stress fracture
Overuse history
Focal bony tenderness
CPPD disease (M11.20)
Acute hot swollen joint in older adult
Chondrocalcinosis on imaging
Deep vein thrombosis (I82.409)
Calf swelling
Risk factors for thrombosis
Past Medical History
Relevant chronic conditions
Chronic conditions
Diabetes mellitus (E11.9)
Chronic kidney disease (N18.9)
Peripheral vascular disease (I73.9)
Rheumatoid arthritis (M06.9)
Gout (M10.9)
Neuropathy
Prior injuries and procedures
Prior ankle history
Prior sprains with instability
Prior ankle fracture
Prior tendon rupture
Prior surgery with hardware
Baseline functional status
Baseline function
Baseline gait and endurance
Baseline need for assistive device
Baseline anticoagulation indication
Baseline fall risk
Physical Exam
General and vital signs
General and vitals
Appearance toxic or nontoxic
Fever presence
Hemodynamic stability
Pain behavior disproportionate concern
Local ankle and foot exam
Local exam
Inspection for deformity
Swelling distribution
Ecchymosis pattern
Skin integrity and open wounds
Point tenderness mapping
Range of motion active and passive
Neurovascular and compartment screening
Neurovascular
Dorsalis pedis pulse
Posterior tibial pulse
Capillary refill
Sensation plantar and dorsal
Motor toe extension and flexion
Compartment firmness and pain with passive stretch
Proximal and adjacent joint exam
Adjacent joint screening
Proximal fibula tenderness
Knee effusion or tenderness
Midfoot tenderness
Achilles tendon palpation
Calf tenderness and asymmetry
Gait and function
Functional testing
Ability to bear weight for 4 steps
Antalgic gait severity
Single leg stance tolerance
Ability to perform heel raise
Lab Studies
Core labs when indicated
Targeted labs
CBC if infection concern
CRP if septic arthritis concern
ESR if inflammatory arthritis concern
Blood cultures if febrile or septic
Metabolic and medication safety labs
Medication safety
Creatinine before NSAID escalation in risk patients
Liver enzymes if acetaminophen overuse concern
INR if warfarin use with bleeding concern
Arthrocentesis studies for suspected septic arthritis
Synovial fluid studies
Cell count with differential
Gram stain
Culture
Crystal analysis
Glucose and protein local protocol dependent
Pitfalls and limitations
Interpretation limitations
Serum uric acid may be normal during acute gout flare
Normal WBC does not exclude septic arthritis
CRP and ESR support inflammation but are nonspecific
Antibiotics before aspiration may reduce culture yield
Imaging
Scoring Systems
Decision rules for radiography
Ottawa Ankle Rules
Ankle radiographs if pain in malleolar zone and any of
Bone tenderness posterior edge or tip of lateral malleolus
Bone tenderness posterior edge or tip of medial malleolus
Inability to bear weight for 4 steps immediately and in ED
Reported sensitivity near 100 percent for clinically significant fracture in validation studies
Ottawa Foot Rules
Foot radiographs if pain in midfoot zone and any of
Bone tenderness at base of fifth metatarsal
Bone tenderness at navicular
Inability to bear weight for 4 steps immediately and in ED
MRI
MRI ankle
Indications
Persistent pain with normal radiographs
Suspected osteochondral lesion
Suspected tendon rupture
Suspected syndesmotic injury with instability
Contraindications and cautions
Non MRI compatible implanted device
Severe claustrophobia
Gadolinium use caution in severe CKD
CT
CT ankle
Indications
Complex fracture definition
Suspected occult fracture with high pretest probability
Preoperative planning
Cautions
Radiation exposure
Contrast nephropathy risk if contrast used
Ultrasound
Ultrasound and POCUS
Uses
Joint effusion detection and guided arthrocentesis
Achilles tendon rupture assessment
Tendon subluxation assessment
DVT evaluation when calf symptoms present
Pitfalls
Effusion does not distinguish septic from inflammatory arthritis
Operator dependence for tendon findings
Special Tests
Bedside ligament and syndesmosis maneuvers
Ankle instability maneuvers
Anterior drawer test
Talar tilt test
Squeeze test for syndesmosis
External rotation stress test
Tendon integrity maneuvers
Tendon tests
Thompson test for Achilles rupture
Single leg heel raise for Achilles function
Posterior tibial tendon single heel rise test
Procedural diagnostics
Procedural tests
Arthrocentesis for hot swollen ankle
Bedside Doppler pulse assessment if weak pulses
Ankle brachial index if arterial insufficiency concern
Compartment pressure measurement if compartment syndrome concern
ECG
When ECG is relevant in ankle pain presentations
ECG indications
Syncope associated with fall or injury
Palpitations preceding injury
Chest pain or dyspnea with calf swelling concern
High risk ECG patterns that change disposition
ECG red flags
Ischemic changes
Ventricular arrhythmia
High grade AV block
Prolonged QT with planned QT prolonging medications
Assessment
Problem representation and severity
Synthesis
Traumatic ankle pain with suspected sprain
Traumatic ankle pain with suspected fracture
Atraumatic hot swollen ankle concerning for septic arthritis versus crystal arthritis
Posterior ankle pain concerning for Achilles tendon injury
Risk stratification
Risk stratification
Neurovascularly intact versus compromised
Open injury versus closed injury
Weight bearing ability
High energy mechanism versus low energy mechanism
Key complications to rule out
Cannot miss complications
Compartment syndrome
Syndesmotic instability
Maisonneuve pattern with proximal fibula injury
Osteochondral injury after sprain
Septic arthritis in atraumatic monoarthritis
Plan
Analgesia and symptom control
Pain control
Acetaminophen PO 1000 mg every 6 hours as needed
Maximum 3000 mg per 24 hours typical
Lower maximum with liver disease or heavy alcohol use
Ibuprofen PO 400 mg every 6 to 8 hours as needed
Avoid with GI bleed history
Avoid with advanced CKD
Avoid with decompensated heart failure
Topical diclofenac gel local protocol dependent
Prefer for older adults with NSAID risk
Avoid on broken skin
Immobilization and functional support
Support
Compression wrap if mild sprain
Air stirrup brace for lateral sprain
Walking boot for severe sprain or occult fracture concern
Crutches with protected weight bearing as tolerated
Diagnostic sequencing
Diagnostic plan
Radiographs if Ottawa rules positive or clinical concern
CT if radiographs show complex fracture or high suspicion occult fracture
MRI if persistent pain with negative radiographs and concern for osteochondral or ligament injury
Arthrocentesis before antibiotics if septic arthritis suspected and patient stable
Condition specific treatment pathways
Pathway selection
Suspected sprain
Early protected mobilization when stable
Physical therapy referral for proprioception and strength
Suspected fracture
Immobilize and keep non weight bearing until stability confirmed
Orthopedics consult if unstable or displaced fracture
Suspected septic arthritis
Immediate orthopedic consultation
IV antibiotics after cultures and aspiration when feasible
Suspected gout
NSAID if low risk
Colchicine PO 1.2 mg once then 0.6 mg 1 hour later
Then 0.6 mg once or twice daily as tolerated
Avoid or reduce dose in CKD and with interacting drugs
Reassessment loop
Reassessment
Repeat neurovascular exam after splinting
Repeat pain score within 30 to 60 minutes after analgesia
Recheck swelling progression before discharge
Escalate if increasing pain out of proportion or new neurologic deficit
Disposition
ICU and high acuity criteria
High acuity disposition
Septic shock or sepsis criteria
Limb ischemia signs
Suspected compartment syndrome
Open fracture with hemodynamic instability
Inpatient admission criteria
Admission indications
Septic arthritis requiring operative management
Unstable fracture requiring urgent surgery
Inability to ambulate with unsafe home situation
Uncontrolled pain despite ED therapy
Observation pathway criteria
Observation
Severe sprain with need for mobility training
Possible occult fracture needing serial exam and follow up imaging plan
Atraumatic monoarthritis awaiting synovial results and clinical trend
Discharge criteria and follow up
Discharge
Neurovascularly intact
Pain controlled on oral regimen
Safe ambulation plan with brace or crutches
Clear follow up plan within 3 to 7 days for fracture concern
Sports medicine or physiotherapy follow up within 1 to 2 weeks for sprain rehab
Discharge Instructions
Copy discharge instructions
Patient facing instructions
Your ankle pain is most consistent with a sprain or soft tissue injury unless imaging showed a fracture
Use the brace or boot as instructed and use crutches if needed to limit pain with walking
Elevate the ankle when resting and use compression if advised
Use acetaminophen and or ibuprofen as directed unless you were told to avoid them
Do not take ibuprofen or other NSAIDs if you have kidney disease severe stomach ulcer bleeding or are on blood thinners unless your clinician said it is safe
Return to the emergency department urgently if
Your foot becomes cold pale blue or numb
You cannot move your toes
Pain rapidly worsens or pain is severe with gentle toe movement
You develop fever or the ankle becomes hot very red and more swollen
You notice new drainage from a wound
Follow up with your clinician or a fracture clinic within the recommended time window
Do not drive if you cannot safely brake or if you are taking sedating pain medication
References
Guidelines and decision tools
Key sources
Stiell IG et al Decision rules for the use of radiography in acute ankle injuries 1993
Martin RL et al JOSPT Clinical Practice Guideline Lateral Ankle Ligament Sprains Revision 2021
Ravn C et al Guideline for management of septic arthritis in native joints SANJO 2023
IDSA and PIDS Clinical Practice Guideline Acute Bacterial Arthritis in Pediatrics 2023
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.