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Approach to the Critical Patient
Immediate priorities
Limb threat triage
Open injury suspicion
Skin break near fracture
Laceration over MCP joint after punch
Neurovascular status
Radial pulse
Ulnar pulse
Capillary refill
Median nerve sensation
Ulnar nerve sensation
Radial nerve sensation
Median nerve motor thumb opposition
Ulnar nerve motor finger abduction
Radial nerve motor wrist extension
Compartment syndrome risk
Pain out of proportion
Pain with passive finger extension
Tense compartments
Progressive paresthesia
Pallor or cool digits
If evolving findings then emergent hand surgery or orthopedics
Time critical actions
Ring removal
If swelling then immediate cutting
If open fracture then antibiotics first when feasible
If fight bite then treat as contaminated open injury
Immobilization before transport
Position of function
Elevation
Imaging timing
Radiographs before reduction when stable
If threatened skin or neurovascular compromise then reduce then radiographs
Post reduction radiographs
Immediately after splinting
Escalation triggers
Surgical activation
Any malrotation
Overlap or scissoring with finger flexion
Open fracture
Visible bone
Deep wound contamination
Intra articular step off
MCP joint involvement
CMC joint involvement
Multiple metacarpals
Hand instability
CMC fracture dislocation
Fifth CMC instability
Persistent neurovascular deficit after reduction
Immediate consultation
Transfer triggers
Need for urgent operative washout
Fight bite over MCP
Suspected vascular injury
Absent pulses
Doppler only signal
Compartment syndrome concern
Rapidly worsening pain and swelling
Key concepts
Functional priorities
Rotation correction as highest priority
Small angulation tolerated
Rotation not tolerated
Early motion strategy
Stable fractures favor early mobilization
Prolonged immobilization increases stiffness
History
Injury context
Mechanism
Punching object or person
Laceration over MCP
Mouth contamination risk
Fall on hand
Axial load through metacarpal
Crush injury
Compartment syndrome risk
Twisting injury
Spiral fracture risk
High energy trauma
Multiple fractures
Timing
Time since injury
Interval swelling progression
Any attempted reduction
Hand factors
Dominant hand
Occupation and sport demands
Baseline hand function
Prior fracture or surgery
Symptoms suggesting complications
Numbness or tingling
Weakness
Increasing tightness
Cold digits
Severe pain with finger motion
Bleeding and infection risks
Anticoagulants
Diabetes
Immunosuppression
Tetanus status
Bite or saliva exposure
Pain and function
Pain pattern
Rest pain
Pain with MCP motion
Pain with gripping
Functional deficits
Inability to make fist
Finger scissoring with flexion
Extensor lag
Physical Exam
Hand survey
Inspection
Dorsal hand swelling
MCP knuckle depression
Finger cascade at rest
Rotational alignment with flexion
Skin tenting
Lacerations
Fight bite wound over MCP
Palpation
Metacarpal tenderness
Crepitus
Step off
CMC joint tenderness
Range of motion
MCP flexion extension
PIP flexion extension
DIP flexion extension
Wrist range of motion
Tendon function
Finger extension against resistance
Finger flexion against resistance
Thumb extension
Thumb opposition
Neurovascular
Radial pulse
Ulnar pulse
Capillary refill
Two point discrimination if concern
Median nerve sensory index fingertip
Ulnar nerve sensory small fingertip
Radial nerve sensory dorsal first web space
Rotational assessment
Rotation checks
Fingertips point toward scaphoid with flexion
Nail plates parallel in flexion
No overlap of digits
Any scissoring treated as malrotation
PITFALLS
Common misses
Normal appearing radiograph with clinical rotation
Fight bite treated as simple laceration
CMC fracture dislocation missed without true lateral
Multiple metacarpal instability underestimated
Over tight splint causing worsening swelling pain
Differential Diagnosis
Traumatic mimics and co injuries
Fracture patterns
Metacarpal head fracture
Metacarpal base fracture
Bennett fracture
Rolando fracture
Phalangeal fracture
Carpal fracture
Dislocations and instability
MCP dislocation
CMC dislocation
Fifth CMC fracture dislocation
Soft tissue injuries
Extensor tendon rupture
Flexor tendon injury
Sagittal band injury
Collateral ligament injury MCP
Infection related
Septic MCP joint after fight bite
Flexor tenosynovitis
Cellulitis
Coding anchors
ICD 10 and SNOMED mapping
Metacarpal fracture unspecified
ICD 10 S62.30
SNOMED CT Metacarpal fracture concept
Fifth metacarpal fracture
ICD 10 S62.306
SNOMED CT Fifth metacarpal fracture concept
Open metacarpal fracture
ICD 10 S62.3 with open fracture qualifier
SNOMED CT Open fracture of metacarpal concept
Human bite of hand
ICD 10 S61.45
SNOMED CT Human bite of hand concept
Laboratory Tests
Standard ED use
Labs usually not required
Isolated closed fracture
No planned sedation
Pre procedure pathway
If procedural sedation planned then glucose bedside when indicated
If anticoagulants or bleeding concern then INR and CBC
Infection pathway
If fight bite then CBC for systemic features
If deep infection concern then CRP
If febrile or toxic then blood cultures
Open fracture pathway
Baseline labs for operative pathway
CBC
Hemoglobin trend if bleeding concern
Creatinine
Antibiotic dosing
Type and screen
If major trauma
PITFALLS
Interpretation limits
Normal labs do not exclude deep hand infection early
Pain severity does not correlate with radiographic displacement
Diagnostic Tests
Scoring Systems
Classification and decision frameworks
Anatomic location
Head
Neck
Shaft
Base
Pattern
Transverse
Oblique
Spiral
Comminuted
Gustilo Anderson open fracture
Type I wound under 1 cm
Type II wound 1 to 10 cm
Type III wound over 10 cm or high energy
Type IIIA adequate coverage
Type IIIB periosteal stripping
Type IIIC vascular injury requiring repair
Management implications
Any malrotation favors operative fixation
Open fracture favors operative washout
Intra articular step off favors fixation
Radiographs
Standard imaging
Hand radiographs
PA view
Oblique view
Lateral view
True lateral importance
CMC alignment
Metacarpal base injury
Post reduction films
Before discharge
Alignment assessment
Rotation assessed clinically not radiographically
Angulation thresholds guidance
Index metacarpal
Neck angulation target under 15 degrees
Shaft angulation target under 10 to 20 degrees
Middle metacarpal
Neck angulation target under 15 degrees
Shaft angulation target under 10 to 20 degrees
Ring metacarpal
Neck angulation target under 30 to 40 degrees
Shaft angulation target under 30 degrees
Small metacarpal
Neck angulation commonly tolerated up to 70 degrees in selected cases
Shaft angulation target under 40 degrees
Shortening
Typical tolerance 2 to 5 mm
Diagnostic adjuncts
Skyline view for metacarpal head
If suspected head fracture
MRI
Indications
Occult fracture with negative radiographs
Persistent focal tenderness
High demand hand use
Ligament injury suspicion
MCP collateral injury
CMC ligament injury
Osteomyelitis concern
Delayed presentation after fight bite
Limitations
Availability delays
Motion artifact
CT
Indications
Intra articular extension uncertainty
Metacarpal head
Metacarpal base CMC
CMC fracture dislocation characterization
Surgical planning for comminution
Limitations
Radiation exposure
Soft tissue detail less than MRI
Disposition
ED disposition tiers
Discharge with splint
Closed fracture
Neurovascularly intact
No malrotation
Acceptable alignment for ray
Pain controlled with oral regimen
Admission or urgent transfer
Open fracture
Fight bite with fracture or joint involvement concern
Neurovascular compromise
Compartment syndrome concern
Irreducible deformity
Multiple metacarpals with instability
Unstable CMC injury
Follow up timing
Routine hand surgery or orthopedics
5 to 7 days
Repeat radiographs
Swelling reassessment
Urgent clinic
Within 24 to 72 hours
Borderline alignment
Significant swelling
High risk compliance concerns
Wound check
24 to 48 hours
Fight bite or contaminated wound
Activity restrictions
Work and sport limits
No gripping or punching
Keep splint dry
Elevation above heart for swelling
Treatment
Immediate life-saving interventions
Early limb protection
Elevation
Ice as tolerated
Ring removal
If open fracture then infection prevention bundle
Sterile saline moist dressing
Antibiotics as soon as possible
Tetanus prophylaxis per status
If fight bite then high risk infection pathway
Avoid primary closure over MCP
Early hand surgery involvement
Immobilization and Splinting
Splint selection
Ulnar side metacarpals
Ulnar gutter splint
Ring metacarpal
Small metacarpal
Radial side metacarpals
Radial gutter splint
Index metacarpal
Middle metacarpal
Thumb metacarpal
Thumb spica
First metacarpal base injury suspicion
Positioning targets
Wrist extension about 20 degrees
MCP flexion 60 to 90 degrees for injured rays
IP joints full extension
Splint technique
Padding over ulnar styloid and metacarpal heads
Three point molding for angulation control
Two finger tightness check
Recheck neurovascular after splint
Reduction
Reduction indications
Threatened skin
Significant angulation with functional deformity
Fracture dislocation
Neurovascular compromise
Reduction cautions
Suspected metacarpal head fracture
Avoid ED manipulation
Suspected base fracture with CMC instability
Hand surgery consultation
Analgesia and anesthesia
Non opioid
Acetaminophen 1000 mg PO
Ibuprofen 600 mg PO
Opioid for severe pain
Hydromorphone 0.5 mg IV
Repeat every 10 to 15 minutes as needed
Monitoring for sedation and respiratory depression
Regional anesthesia
Hematoma block
Lidocaine 1 percent without epinephrine 5 to 10 mL
Aspirate before injection
Max lidocaine dose 4.5 mg per kg
Digital nerve block for adjacent finger pain
Lidocaine 1 percent without epinephrine 2 to 3 mL per side
Procedural sedation when required
Ketamine IV 1 mg per kg
Repeat 0.5 mg per kg if needed
Minimum 5 minutes between doses
Airway equipment ready
Reduction principles
Traction and countertraction
Deformity exaggeration then reverse
Gentle sustained pressure
Avoid repeated forceful attempts
Boxer fracture technique options
Jahss maneuver
MCP flexion 90 degrees
Dorsal pressure through proximal phalanx
Stabilize metacarpal shaft
Post reduction requirements
Immediate rotation reassessment
Immediate neurovascular reassessment
Post reduction radiographs
Splint in stable position
Open fracture medications and timing
Antibiotics goals
Early IV dosing as soon as feasible
Gram positive coverage as baseline
Type I and II open fracture typical approach
Cefazolin 2 g IV every 8 hours
Continue for 24 hours after closure when operative plan
If severe cephalosporin allergy then clindamycin 900 mg IV every 8 hours
Type III open fracture typical approach
Cefazolin 2 g IV every 8 hours
Add gentamicin 5 mg per kg IV every 24 hours
If soil or fecal contamination then add anaerobic coverage per local protocol
Fight bite antibiotics
Amoxicillin clavulanate 875 mg 125 mg PO twice daily
Duration 3 to 5 days for prophylaxis
Longer course if infection present
If penicillin allergy then clindamycin plus trimethoprim sulfamethoxazole
Tetanus prophylaxis
If unknown or incomplete then vaccine
If dirty wound and under immunized then add immune globulin
DVT prophylaxis when relevant
Generally not indicated
Isolated upper extremity splint
Consider per local protocol
Polytrauma admission
Prolonged immobility
Multiple injuries
Special Populations
Pregnancy
Pregnancy considerations
Imaging approach
Radiographs acceptable with shielding when feasible
CT rarely needed for isolated hand injury
Analgesia selection
Acetaminophen preferred
Avoid NSAIDs in later pregnancy per obstetric guidance
Procedural sedation
Shared decision making with obstetrics if viable gestation
Geriatric
Geriatric considerations
Fragility mechanism evaluation
Fall risk
Osteoporosis risk
Lower threshold for follow up support
Splint care assistance
Return precautions reliability
Medication safety
Opioid delirium risk
Renal dosing for antibiotics if needed
Pediatrics
Pediatric considerations
Growth plate risk
Physeal injury at metacarpal base
Remodeling potential
Greater tolerance for angulation than adults in selected cases
Non accidental trauma context when appropriate
Inconsistent history
Multiple injuries
Weight based dosing
Acetaminophen 15 mg per kg PO
Ibuprofen 10 mg per kg PO
Lidocaine max 4.5 mg per kg without epinephrine
Background
Epidemiology
Frequency and demographics
Metacarpal fractures common within hand fractures
Reported around 40 percent of hand fractures in some series
Fifth metacarpal neck fracture common
Reported around 20 percent of hand fractures
Higher rates in adolescents and young adults
Contact sport and punching mechanisms
Male predominance in many cohorts
Higher exposure to risk activities
Pathophysiology
Biomechanics
Apex dorsal angulation tendency
Interossei and intrinsic muscle forces
Rotational deformity mechanism
Oblique and spiral patterns
CMC stability differences
Index and middle more rigid
Ring and small more mobile
Injury pattern mapping
Neck fractures
Axial load through clenched fist
Volar comminution at neck
Shaft fractures
Bending and torsion forces
Base fractures
CMC joint injury risk
Intra articular extension risk
Therapeutic Considerations
Nonoperative rationale
Many angulated fractures function well if no rotation
Early motion reduces stiffness when stable
Operative rationale
Rotation leads to scissoring and grip dysfunction
Intra articular incongruity risks arthritis
Multiple metacarpals risk hand collapse
Evidence highlights
Small finger neck angulation sometimes acceptable up to 70 degrees in selected studies
Reduction not routinely required for all boxer fractures if function acceptable
Patient Discharge Instructions
copy discharge instructions
Discharge guidance
Elevation above heart most of the day for first 48 hours
Ice 15 to 20 minutes up to 4 times daily if tolerated
Keep splint clean and dry
No punching
No heavy gripping or lifting with injured hand
Finger range of motion for free joints
Pain plan
Acetaminophen as directed on label
Ibuprofen as directed on label if allowed
Opioid only if prescribed
Wound care if laceration
Daily inspection for redness drainage odor
Return to ED immediately
Increasing pain not controlled
New numbness or tingling
Blue pale or cold fingers
Increasing tightness in splint
Unable to move fingers
Fever
Pus or spreading redness
Follow up plan
Hand surgery or orthopedics within 5 to 7 days
Earlier 24 to 72 hours if reduction performed or alignment borderline
Wound check 24 to 48 hours for fight bite or contaminated wound
References
Evidence based sources
Core reviews and epidemiology
Malik S and colleagues Fifth Metacarpal Fracture StatPearls 2024
Kollitz KM and colleagues Metacarpal fractures treatment and complications 2013
Carreño A and colleagues Management of metacarpal fractures 2020
Deuschl J and colleagues Epidemiology of metacarpal fractures 2025
Alignment and management thresholds
Orthobullets Metacarpal Fractures Hand updated 2025
Medscape Metacarpal Fractures Treatment and Management updated 2024
Royal Childrens Hospital Melbourne Metacarpal fractures ED guideline
Open fracture antibiotics
EAST practice management guideline Open fractures prophylactic antibiotics archived
UNMC open fracture antibiotic prophylaxis guideline PDF
Bite and fight bite antibiotics
Appelbaum RD and colleagues Antibiotic prophylaxis in injury AAST consensus 2024
Hussain MH and colleagues Boxers fracture literature review 2020
SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.