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Approach to the Critical Patient
Triage priorities
Immediate threats
Open fracture
Gross contamination
Bone or tendon exposure
Neurovascular compromise
Absent capillary refill
Pulseless digit
Progressive sensory loss
Compartment syndrome
Pain out of proportion
Pain with passive stretch
Tense compartments
Fight bite
Dorsal MCP laceration
Human bite contamination
Early actions
Analgesia strategy
Oral and intranasal options first when stable
Regional anesthesia if expertise available
Remove constrictors
Rings
Tight wraps
Elevation and ice
Skin protection with barrier
Reassess swelling trend
Immediate decision points
Stability and alignment
Rotational deformity
None acceptable for nonoperative pathway
Open wound communication
Treat as open fracture if uncertain
Intra-articular involvement
Low threshold for hand surgery
Consultation triggers
Hand surgery or orthopedics now
Open fracture
Neurovascular compromise
Irreducible deformity
Malrotation after reduction attempt
Multiple metacarpals fractured
Suspected fight bite
Transfer triggers
No local hand surgery coverage
Open fracture with contamination
Compartment syndrome concern
Monitoring and reassessment
Reassessment cadence
Post-analgesia neurovascular exam
Capillary refill
Two-point discrimination
Motor function
Post-reduction check
Finger cascade alignment
Rotational alignment with fist
Post-splint check
Pain
Skin pressure points
Distal perfusion
History
Core history
Injury context
Mechanism
Direct blow
Axial load
Crush
Punching injury
Time since injury
Immediate swelling
Delayed presentation
Hand dominance
Dominant hand involvement
Occupation and sport
Need for grip strength
Return to play timeline
Symptoms and function
Pain location
Metacarpal head and neck
Shaft
Base and CMC region
Mechanical symptoms
Malalignment sensation
Clicking
Functional loss
Grip weakness
Finger motion limitation
Wound and contamination
Skin break
Small puncture
Laceration
Human bite risk
Altercation history
Tooth contact
Risk modifiers
Anticoagulants
Warfarin
DOACs
Diabetes
Infection risk
Smoking
Delayed union risk
Prior hand injury
Baseline deformity
Immunization and medications
Tetanus status
Unknown or incomplete series
Drug allergies
Beta-lactam reaction type
Focused red flags
Red flag features
Numbness or tingling
Median distribution
Ulnar distribution
Cold digit
Color change
Escalating pain
Disproportionate pain
Severe swelling
Tight skin
Fever or drainage
Delayed infection concern
Physical Exam
Inspection and alignment
Visual survey
Skin integrity
Laceration over MCP
Puncture wound
Swelling pattern
Dorsal hand swelling
Localized knuckle flattening
Deformity
Dorsal apex angulation
Shortening
Finger alignment
Resting cascade
Fingertips toward scaphoid tubercle
Rotational alignment
Nail plate parallelism
Finger overlap with fist
MCP knuckle prominence
Loss of contour
Palpation and range
Bony tenderness
Metacarpal head and neck
Fifth metacarpal neck focus
Shaft
Step-off
Base and CMC
First metacarpal base pain
Joint assessment
MCP stability
Collateral ligament tenderness
CMC stability
Dorsal subluxation
Tendon function
Extensor mechanism
Active MCP extension
Flexor tendons
FDS and FDP function
Intrinsics
Finger abduction and adduction
Neurovascular and compartment
Perfusion
Capillary refill
Delayed refill threshold 2 seconds
Skin temperature
Asymmetry
Radial and ulnar pulses
Proximal vascular status
Sensation
Median nerve
Index fingertip sensation
Ulnar nerve
Small fingertip sensation
Radial nerve
Dorsal first web space sensation
Motor
Median
Thumb opposition
Ulnar
Finger abduction
Radial
Wrist and finger extension
Compartment syndrome screening
Pain with passive stretch
Finger extension stretch pain
Firm compartments
Dorsal interosseous spaces
Progressive neurologic deficit
Worsening paresthesia
Differential Diagnosis
Traumatic hand conditions
Fracture and dislocation differentials
Phalangeal fracture
Proximal phalanx fracture
Middle phalanx fracture
MCP dislocation
Dorsal MCP dislocation
CMC dislocation
Fifth CMC dislocation
Carpal fracture
Scaphoid fracture
Hamate fracture
Bennett fracture
First metacarpal base intra-articular fracture
Rolando fracture
Comminuted first metacarpal base fracture
Soft tissue and neurovascular
Extensor tendon rupture
Loss of active extension
Flexor tendon rupture
Loss of DIP or PIP flexion
Digital nerve injury
Two-point discrimination loss
Digital artery injury
Poor perfusion
Compartment syndrome
Escalating pain
Infection and foreign body
Fight bite infection
Septic MCP joint
Retained foreign body
Glass
Tooth fragment
Coding considerations
Coding anchors
ICD-10 S62.3
Fracture of metacarpal bone
SNOMED CT concept
Fracture of metacarpal bone (disorder)
Laboratory Tests
When labs matter
Lab strategy
No routine labs for closed isolated fracture
Normal vitals
No open wound
Open fracture or deep wound
Complete blood count for infection baseline
C-reactive protein for delayed presentation
Basic metabolic panel for operative planning context
Anticoagulation
INR for warfarin
Platelets for bleeding concern
Infection concern
Blood cultures for systemic toxicity
Point-of-care testing
Point-of-care considerations
Glucose for diabetes and infection risk
Hyperglycemia threshold 11.1 mmol/L
Pregnancy test
Reproductive age with imaging needs
Diagnostic Tests
Scoring Systems
Classification and decision support
Open fracture grading
Gustilo-Anderson type I
Gustilo-Anderson type II
Gustilo-Anderson type III
Pediatric physeal classification
Salter-Harris I
Salter-Harris II
Salter-Harris III
Salter-Harris IV
Salter-Harris V
Acceptable alignment concepts
Rotational deformity
Any malrotation requires reduction or operative evaluation
Fifth metacarpal neck angulation
Up to 70 degrees may be acceptable in select closed injuries
MRI
MRI indications
Occult fracture with persistent pain and negative radiographs
Suspected associated carpal fracture
Ligament injury assessment
CMC ligament disruption
Tendon injury evaluation
Extensor tendon disruption
MRI constraints
Limited ED utility for straightforward metacarpal fracture
Delays in disposition
Metal contraindications
Retained metallic foreign body concern
CT
CT indications
Intra-articular fracture complexity
First metacarpal base fracture pattern
Comminution and surgical planning
Multiple metacarpals
CMC fracture-dislocation suspicion
Subtle base injury on radiographs
CT pearls
Axial and sagittal reconstructions
Articular step-off quantification
Radiation minimization
Focused hand protocol when available
Ultrasound
Ultrasound applications
Tendon integrity
Extensor tendon continuity
Retained foreign body
Radiolucent foreign body detection
Hematoma and vascular flow
Doppler for perfusion concern
Ultrasound limitations
Operator dependency
Expertise requirement
Bony alignment characterization
Radiographs remain primary
Plain radiography
Radiographs
Standard hand series
PA view
Lateral view
Oblique view
Dedicated finger views
Isolated digit alignment
Post-reduction films
Confirm angulation correction
Confirm no new displacement
Disposition
Site of care
Disposition pathways
ED discharge with splint
Closed fracture
No malrotation
Acceptable angulation by digit and fracture location
Neurovascularly intact
ED observation or admission
Uncontrolled pain
Recurrent displacement after reduction
Multiple metacarpals
Urgent operative pathway
Open fracture
Fight bite with joint involvement suspicion
Neurovascular compromise
Compartment syndrome concern
Follow-up timing
Follow-up plan
Hand surgery or orthopedics follow-up
3 to 7 days typical for stable injuries
24 to 48 hours for borderline alignment
Repeat radiographs
7 to 10 days for displacement risk
Therapy referral
Early mobilization plan when safe
Treatment
Analgesia and anesthesia
Pain control
Non-opioid foundation
Acetaminophen PO 1000 mg
Maximum 4000 mg per 24 hours
Ibuprofen PO 400 mg
Every 6 to 8 hours as needed
Maximum 2400 mg per 24 hours
Opioid for severe pain
Morphine PO 0.2 mg/kg
Maximum single dose 15 mg
Hydromorphone PO 1 mg
Titrate by 1 mg increments
Regional anesthesia options
Ulnar nerve block
Local anesthetic per institutional protocol
Digital nerve block
Avoid epinephrine if digital ischemia concern
Reduction and immobilization
Closed reduction indications
Rotational deformity
Immediate reduction attempt
Angulation beyond acceptable limits
Digit-specific tolerance
Significant shortening
Functional impairment risk
Reduction techniques
Fifth metacarpal neck reduction
90-90 method
MCP flexion to 90 degrees
PIP flexion to 90 degrees
Volar pressure over dorsal apex
Post-reduction confirmation
Rotational alignment with fist
No finger overlap
Radiographic confirmation
Recheck angulation
Splinting choices
Ulnar gutter splint
Fourth and fifth metacarpals
MCP flexion 70 to 90 degrees
IP joints free when possible
Radial gutter splint
Second and third metacarpals
MCP flexion 70 to 90 degrees
Thumb spica splint
First metacarpal fractures
CMC immobilization
Buddy taping option
Stable minimally displaced fracture
No malrotation
Pain controlled
Early mobilization protocol
Hand therapy follow-up
Open fracture and wound care
Open fracture protocol
Irrigation and debridement
Gross debris removal
High-pressure irrigation avoided for small clean wounds
Antibiotics
Initiate within 60 minutes when possible
Cefazolin IV 2 g
Every 8 hours
If severe beta-lactam allergy
Clindamycin IV 900 mg
Every 8 hours
Tetanus prophylaxis
Td or Tdap if not up to date
Tetanus immune globulin if unknown or incomplete and dirty wound
Hand surgery consultation
All open fractures for operative planning
Fight bite management
Fight bite pathway
High-risk anatomy
MCP joint extensor hood zone
Antibiotics
Amoxicillin-clavulanate PO 875 mg
Twice daily
Typical duration 5 to 7 days for prophylaxis
If severe penicillin allergy
Doxycycline PO 100 mg
Twice daily
Metronidazole PO 500 mg
Twice daily
Wound handling
Avoid primary closure for contaminated bite wounds
Copious irrigation
Imaging adjuncts
Radiographs for tooth fragment
Retained foreign body check
Procedural sedation
Sedation options when needed
Ketamine IV 1 mg/kg
Additional 0.5 mg/kg as needed
Fentanyl IV 1 mcg/kg
Titrate by 0.5 mcg/kg
Midazolam IV 0.05 mg/kg
Maximum 5 mg
Monitoring requirements
Continuous pulse oximetry
Blood pressure every 5 minutes
End-tidal CO2 when available
Nonoperative versus operative indications
Operative indications
Rotational deformity
Persistent after reduction
Intra-articular step-off
Functional impairment risk
Unstable fracture pattern
Recurrent displacement
Multiple metacarpals
Hand arch compromise
Open fracture
Operative debridement requirement
Special Populations
Pregnancy
Pregnancy considerations
Imaging safety
Radiographs acceptable with shielding
CT only if needed for surgical planning
Analgesia selection
Acetaminophen preferred
NSAID avoidance in third trimester
Antibiotic selection
Avoid doxycycline
Beta-lactams generally preferred when appropriate
Geriatric
Geriatric considerations
Osteoporosis and fragility patterns
Low-energy mechanism still significant
Skin fragility
Splint pressure injury risk
Anticoagulation
Hematoma risk with blocks and reductions
Functional goals
Early therapy coordination
Pediatrics
Pediatric considerations
Physis risk
Salter-Harris classification attention
Reduction benefit limits for fifth neck
Angulation less than 50 degrees may have limited improvement with reduction
Immobilization strategy
Shorter immobilization when stable to reduce stiffness
Weight-based antibiotics for open fracture
Cefazolin IV 30 mg/kg
Maximum 2000 mg per dose
Safeguarding
Non-accidental trauma concern if mechanism inconsistent
Background
Epidemiology
Epidemiology overview
Common injury
Fifth metacarpal neck common after punching
Typical demographics
Adolescents and young adults
High-risk mechanisms
Crush injuries
Fight bite injuries
Pathophysiology
Injury mechanics
Dorsal apex angulation tendency
Volar displacement of distal fragment
Rotational deformity mechanism
Interosseous and lumbrical pull
Functional consequences
Grip strength reduction with malalignment
Scissoring with rotation
Therapeutic Considerations
Nonoperative principles
Rotation as primary determinant
Any rotation unacceptable
Angulation tolerance by ray
Ulnar metacarpals tolerate more angulation than radial
Early mobilization benefits
Reduced stiffness risk when fracture stable
Antibiotic prophylaxis in open fractures
Infection reduction benefit
Prophylaxis beneficial for open fractures of hand and digits
Duration minimization
Prolonged prophylaxis beyond 24 hours generally not needed for uncomplicated open fracture after definitive care
Patient Discharge Instructions
copy discharge instructions
Home care
Splint care
Keep dry
Do not insert objects into splint
Elevation
Above heart level for 48 hours
Ice
15 minutes at a time
Several times daily
Pain control
Acetaminophen and ibuprofen schedule as directed
Activity
No punching or gripping loads
Avoid lifting with injured hand
Finger motion
Move free fingers often
Stop if severe pain
Return to ED now
Increasing pain not controlled
Especially pain with finger stretch
Numbness or tingling
New or worsening
Fingers turning blue or cold
Delayed capillary refill
Splint too tight
Swelling with pressure pain
Fever or wound drainage
Redness spreading
Follow-up
Hand surgery or orthopedics appointment
Within 3 to 7 days unless told sooner
Repeat x-ray
As arranged
Wound check
Within 24 to 48 hours if any skin break
References
Clinical guidelines and evidence
Source list
Royal Children’s Hospital Melbourne
Metacarpal fractures emergency department guideline
Merck Manual Professional
Ulnar gutter splint technique and MCP flexion 70 to 90 degrees
PubMed Central reviews
Metacarpal fracture management review
Fifth metacarpal neck fracture review
EAST practice management guideline
Prophylactic antibiotics for open fractures
Institutional open fracture antibiotic guideline
Cefazolin as first-line prophylaxis
StatPearls NCBI Bookshelf
Fifth metacarpal fracture reduction pearls
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.