MRI without gadolinium preferred for ligament assessment when needed
Analgesia considerations
Acetaminophen preferred first-line
NSAID avoidance in later pregnancy per obstetric guidance
Thrombosis risk
Increased baseline VTE risk with immobilization
Geriatric
Older adult considerations
Fragility and fall risk
Home safety and mobility aid planning
Comorbidity and skin risk
Peripheral vascular disease screening
Skin breakdown risk under splint
Pain medication sensitivity
Opioid dose reduction and delirium monitoring
Pediatrics
Pediatric considerations
Growth and remodeling context
Physeal injury exclusion on imaging review
Imaging strategy
Weight-bearing views often not tolerated
Low threshold for advanced imaging when high suspicion
Nonaccidental trauma context when inconsistent history
Safeguarding pathway per local policy
Background
Epidemiology
Frequency and context
Relatively uncommon injury with high miss rate on initial presentation
Miss risk increased with non-weight-bearing radiographs
Mechanism distribution
Low-energy sports mechanism common in subtle ligamentous injuries
High-energy trauma common in fracture-dislocations
Pathophysiology
Anatomic basis
Tarsometatarsal joint complex disruption
Lisfranc ligament injury between medial cuneiform and base of 2nd metatarsal
Stability role of 2nd metatarsal keystone
Loss of alignment leads to midfoot collapse
Injury spectrum
Purely ligamentous sprain to complete fracture-dislocation
Therapeutic Considerations
Treatment rationale
Anatomic reduction importance
Reduced risk of post-traumatic midfoot arthritis
Nonoperative pathway limitations
Only for stable injuries without displacement on weight-bearing imaging
Operative pathway indications
Instability or displacement
Failure of conservative management
Complication mitigation
Strict non-weight-bearing reduces displacement risk in early healing
Guideline framing
Orthopedic consensus supports urgent fixation for unstable Lisfranc injuries (Class I consensus)
Patient Discharge Instructions
Copy discharge instructions
Discharge instructions
Non-weight-bearing on injured foot
No walking or standing on the splinted foot
Splint care
Keep splint clean and dry
Do not insert objects inside splint
Swelling control
Elevation above heart as much as possible for 48 to 72 hours
Ice 15 to 20 minutes at a time with skin protection
Pain control plan
Acetaminophen as directed on label
Ibuprofen as directed on label if safe for you
Return to ED immediately for
Increasing pain not controlled with medication
New numbness or tingling in toes
Toes becoming pale, blue, cold, or hard to move
Splint feels too tight or increasing pressure
New or worsening swelling with severe pain
Fever or wound drainage if any cut or open wound
Follow-up
Orthopedics or fracture clinic within the timeframe provided
Bring imaging results to appointment
References
Guidelines and evidence sources
Core references
AAOS foot and ankle injury guidance for midfoot trauma evaluation and referral
Nonoperative vs operative decision anchored on stability and displacement
Orthopedic trauma classification references for Lisfranc injuries
Myerson classification
Nunley and Vertullo staging for subtle injuries
ACEP clinical policy framework for procedural sedation safety (Level B)
Monitoring and recovery criteria
ATLS principles for high-energy trauma assessment
Concurrent injury screening in high-energy Lisfranc mechanisms
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