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Approach to the Critical Patient
Triage and limb threat
Immediate priorities
Open injury
Visible bone
Deep laceration over carpus
Neurovascular compromise
Pale or cool hand
Capillary refill > 2 seconds
Absent radial pulse
Doppler-only pulse
Compartment syndrome concern
Pain out of proportion
Pain with passive finger extension
Firm forearm compartments
High-risk instability
Suspected perilunate injury
Gross carpal deformity
Immediate actions and documentation
Time-critical actions
Ring and constriction removal
If unable, urgent ring cutter
If digital ischemia, immediate removal before imaging
Pre-immobilization neurovascular status
Radial pulse
Ulnar pulse
Capillary refill
Median nerve sensation
Ulnar nerve sensation
Radial nerve sensation
Median nerve motor
Ulnar nerve motor
Radial nerve motor
Immobilization before definitive imaging when unstable
Significant deformity
Severe pain with motion
Post-immobilization neurovascular status
Same domains as pre-immobilization
Pain trend after splint
Perilunate and dislocation escalation
Perilunate emergency pathway
Median nerve compression features
Thenar numbness
Thumb-index-middle paresthesia
Thenar weakness
Radiographic suspicion
Lateral view malalignment
Disrupted Gilula arcs
If suspected perilunate or lunate dislocation, urgent hand surgery or orthopedics
Closed reduction attempt only if neurovascular compromise and immediate specialist delay
Post-reduction imaging required
History
Mechanism and timing
Injury context
FOOSH
Wrist extension angle
Ulnar deviation at impact
Direct blow to ulnar palm
Bat, club, racquet mechanism
Handlebar impact
Axial load through metacarpals
Punch against object
Fall onto clenched fist
High-energy trauma
MVC
Fall from height
Time since injury
< 24 hours
1-7 days
> 7 days
Symptoms and red flags
Symptom pattern
Radial-sided wrist pain
Worse with pinch or grip
Worse with wrist extension
Ulnar-sided wrist pain
Worse with ulnar deviation
Worse with gripping a handle
Clicking or instability sense
Painful clunk with motion
Weak grip
Neuro symptoms
Median distribution paresthesia
Ulnar distribution paresthesia
Skin integrity concern
Laceration over carpus
Contamination or foreign body
Patient factors and baseline
Risk modifiers
Hand dominance
Dominant-hand injury functional impact
Occupation or sport demands
Prior wrist injury
Prior scaphoid fracture
Prior carpal surgery
Tobacco or nicotine use
Nonunion risk counseling trigger
Follow-up urgency increased
Anticoagulants
Hematoma risk
Low threshold for compartment evaluation
Physical Exam
Inspection and palpation map
Regional findings
Swelling and ecchymosis distribution
Radial snuffbox swelling
Volar wrist swelling
Hypothenar swelling
Skin integrity
Laceration depth
Tent skin blanching
Puncture near hook of hamate region
Bony tenderness map
Anatomic snuffbox tenderness
Scaphoid tubercle tenderness
Dorsal triquetrum tenderness
Hook of hamate tenderness
Pisiform tenderness
Trapezium base thumb tenderness
Joint above and below
Elbow radial head tenderness
Metacarpal base tenderness
Functional maneuvers and neurovascular
Function and stability
Wrist range limitation
Pain with extension
Pain with ulnar deviation
Grip strength limitation
Pain-inhibited grip
True weakness concern
Median nerve function
Thumb opposition strength
Thenar sensation
Ulnar nerve function
Finger abduction strength
Small finger sensation
Radial nerve function
Thumb extension strength
Dorsal first webspace sensation
Perfusion
Capillary refill
Radial pulse
Skin temperature symmetry
PITFALLS
High-risk misses
Normal initial radiographs in scaphoid fracture
Persistent snuffbox tenderness pathway
Immobilize and arrange advanced imaging
Missed perilunate injury
Lateral view not obtained or not true lateral
Subtle malalignment ignored
Hook of hamate missed without dedicated views
Carpal tunnel view omission
CT requirement in athletes with ulnar palm pain
Differential Diagnosis
Carpal fractures and patterns
Carpal fracture spectrum
Scaphoid fracture
ICD-10 S62.0-
SNOMED CT concept: Fracture of scaphoid bone
Lunate fracture
ICD-10 S62.1-
SNOMED CT concept: Fracture of lunate
Triquetrum fracture
ICD-10 S62.14-
SNOMED CT concept: Fracture of triquetrum
Pisiform fracture
ICD-10 S62.16-
SNOMED CT concept: Fracture of pisiform
Trapezium fracture
ICD-10 S62.17-
SNOMED CT concept: Fracture of trapezium
Trapezoid fracture
ICD-10 S62.18-
SNOMED CT concept: Fracture of trapezoid
Capitate fracture
ICD-10 S62.13-
SNOMED CT concept: Fracture of capitate
Hamate fracture
ICD-10 S62.15-
SNOMED CT concept: Fracture of hamate
Mimics and co-injuries
Non-fracture diagnoses
Scapholunate ligament injury
Watson shift pain or clunk
Widened SL interval on radiographs
TFCC injury
Ulnar-sided pain with rotation
DRUJ tenderness
Distal radius fracture
Colles pattern
Intra-articular extension
Perilunate or lunate dislocation
Median nerve symptoms
Lateral view carpal malalignment
Extensor carpi ulnaris tendinopathy
Ulnar-sided pain without bony tenderness
Pain with resisted extension and ulnar deviation
Laboratory Tests
When labs matter
Indication-based labs
Open injury or contamination
CBC for infection or bleeding concern
Basic metabolic panel for operative planning
Significant bleeding or anticoagulation
INR for warfarin
Anti-Xa level per local protocol for factor Xa inhibitors
Procedural sedation plan
Glucose if altered mental status risk
Pregnancy test when applicable
Crush injury or prolonged ischemia concern
Creatine kinase for rhabdomyolysis concern
Creatinine for renal risk
Interpretation and pitfalls
Limitations
Normal labs do not exclude compartment syndrome
Diagnosis remains clinical
Escalation based on exam trajectory
Coagulation tests may not reflect DOAC effect reliably
Use local reversal pathways when high-risk bleeding
Specialist consultation when urgent surgery likely
Diagnostic Tests
Scoring Systems
Fracture and instability classifications
Herbert classification for scaphoid
Type A acute stable
A1 tubercle
A2 incomplete waist
Type B acute unstable
B1 distal oblique
B2 complete waist
B3 proximal pole
B4 trans-scaphoid perilunate
B5 comminuted
Type C delayed union
Persistent fracture line
Minimal sclerosis
Type D established nonunion
Sclerotic margins
Cystic change
Humpback deformity or collapse
Mayfield stages for perilunate instability
Stage I scapholunate dissociation
SL interval widening
Rotary subluxation
Stage II capitolunate disruption
Capitate displaces dorsally
Lunate remains aligned with radius early
Stage III lunotriquetral disruption
Complete carpal dissociation progression
Increased instability
Stage IV lunate dislocation
Lunate volar rotation
Median nerve compression risk
Radiographs
X-ray strategy
Standard wrist series
PA
Lateral true lateral
Oblique
Scaphoid views when suspected
Ulnar deviation scaphoid view
PA with clenched fist for SL injury suspicion
Hamate hook views when suspected
Carpal tunnel view
Supinated oblique view
Alignment checks
Gilula arcs continuity on PA
Lunate-capitate-radius colinearity on lateral
Post-reduction films when reduction performed
Confirm alignment
Document improvement
MRI
MRI indications and performance
Occult scaphoid fracture pathway
High clinical suspicion with negative X-ray
Early MRI within days to reduce unnecessary immobilization
Avascular necrosis evaluation
Proximal pole scaphoid concern
Lunate ischemia concern
Ligament injury assessment
Scapholunate ligament tear
Lunotriquetral ligament tear
Contraindications and limitations
Ferromagnetic implant risk
Motion artifact in severe pain
CT
CT indications and planning
Hook of hamate fracture confirmation
Persistent hypothenar pain with negative X-ray
Athlete or bat-sport mechanism
Scaphoid displacement assessment
Surgical planning for displaced waist fracture
Assessment of comminution
Complex carpal fracture-dislocation
Trans-scaphoid perilunate fracture-dislocation
Multibone carpal injury mapping
Technique considerations
Thin-slice CT for carpal detail
Coronal and sagittal reconstructions
Disposition
Discharge criteria
Outpatient management pathway
Stable vitals
No systemic trauma concerns
Pain controlled with oral meds
Intact neurovascular status
Normal capillary refill
No progressive neurologic symptoms
Appropriate immobilization applied
Splint well-fitted
Post-splint neurovascular documented
Follow-up arranged
Hand surgery or orthopedics timeframe set
Advanced imaging plan when needed
Admission, urgent consult, and transfer
Escalation triggers
Open fracture
IV antibiotics pathway
Urgent operative evaluation
Perilunate or lunate dislocation
Emergent reduction need
Urgent hand surgery involvement
Neurovascular compromise
Persistent median nerve deficit
Pulseless or cool hand
Compartment syndrome concern
Progressive pain despite analgesia
Pain with passive stretch increasing
Unstable fracture pattern
Displaced scaphoid fracture
Capitate fracture with rotation
Carpal fracture-dislocation
Treatment
Immediate life-saving interventions
Limb-threatening actions
If pulseless or cool hand, immediate escalation
Emergent specialist consult
Avoid delays for nonessential imaging
If open injury, antibiotics and tetanus pathway
Cover wound with sterile dressing
Minimize repeated wound probing
If suspected perilunate with median nerve symptoms, urgent reduction pathway
Analgesia readiness
Post-reduction neurovascular reassessment
Immobilization and Splinting
Splint selection by suspected injury
Scaphoid suspicion
Thumb spica splint
Wrist neutral to slight extension
Nonspecific wrist pain with stable X-ray
Volar wrist splint
Removable brace option if low risk
Perilunate or major instability suspicion
Sugar tong splint
Strict immobilization and elevation
Ulnar palm pain with hamate hook suspicion
Ulnar gutter or short arm splint
Avoid gripping activities
Splint principles
Swelling-phase avoidance of circumferential cast
Splinting preferred initially
Recheck swelling in 2-5 days
Elevation and edema control
Hand above heart level
Finger ROM encouraged if safe
Post-splint checks
Median nerve sensation
Ulnar nerve sensation
Capillary refill
Reduction
Reduction indications
Perilunate or lunate dislocation
Median nerve compromise
Severe deformity
Gross malalignment threatening skin
Blanching or tenting
Progressive swelling with tight skin
Analgesia and anesthesia options
Local and regional options
Hematoma block when applicable
Avoid in open injury
Aspirate before injection
Ultrasound-guided regional block when available
Median nerve block for select procedures
Ulnar nerve block for ulnar-sided pain
Procedural sedation pathway when required
Monitoring and airway readiness
Continuous pulse oximetry
ECG monitoring
Capnography when available
Medication options
Ketamine IV 0.5-1 mg/kg
Additional 0.25-0.5 mg/kg as needed
Emergence reactions preparedness
Propofol IV 0.5-1 mg/kg
Additional 0.25-0.5 mg/kg boluses
Hypotension risk mitigation
Fentanyl IV 0.5-1 mcg/kg
Repeat dosing to effect
Respiratory depression monitoring
Reduction technique principles for perilunate patterns
Longitudinal traction and countertraction
Finger traps or manual traction
Sustained traction 1-3 minutes
Dorsal pressure on displaced capitate region
Restore lunate-capitate alignment
Avoid repeated forceful attempts
Post-reduction stabilization
Sugar tong or well-molded short arm splint
Immediate post-reduction radiographs
Failed reduction pathway
Persistent malalignment
Urgent hand surgery evaluation
CT for injury mapping if stable
Persistent median nerve deficit
Emergent specialist escalation
Consider carpal tunnel decompression per specialist
Open fracture medications and timing
Antibiotics and tetanus
Antibiotic timing target
As early as feasible
Do not delay for imaging when clearly open
Typical antibiotic choices by contamination risk
First-generation cephalosporin for low contamination
Add gram-negative coverage for high contamination per local protocol
Penicillin allergy alternative per local protocol
Tetanus prophylaxis
Tdap booster when indicated
Tetanus immune globulin when indicated
Wound care
Sterile moist dressing
Irrigation volume per contamination severity
Avoid primary closure in ED unless specialist-directed
DVT prophylaxis when relevant
VTE risk consideration
Upper extremity isolated carpal fractures
Routine pharmacologic prophylaxis usually not indicated
Encourage early ambulation
High-risk patients with immobilization and additional factors
Prior VTE history
Active malignancy
Prolonged immobility
Alignment with local protocol
Document rationale when deviating
Coordinate with admitting or operative service
Special Populations
Pregnancy
Pregnancy considerations
Imaging safety
Extremity radiographs with shielding when feasible
CT wrist generally low fetal exposure due to distance
Analgesia considerations
Acetaminophen as first-line
NSAID avoidance in later pregnancy per obstetric guidance
Disposition thresholds
Lower threshold for evaluation of associated trauma
Rh status evaluation when significant trauma per obstetric protocol
Geriatric
Older adult considerations
Fragility mechanisms
Low-energy FOOSH common
Osteoporosis risk counseling
Complication risk
Delirium risk with opioids
Higher risk from prolonged immobilization
Follow-up urgency
Lower threshold for early advanced imaging
Early hand therapy planning
Pediatrics
Pediatric considerations
Physeal injury differential
Distal radius Salter-Harris patterns
Carpal ossification stage limitations on X-ray
Exam challenges
Pain-limited localization
Behavioral barriers to neuro exam
Immobilization approach
Thumb spica for scaphoid suspicion in adolescents
Reassessment within 5-7 days when X-ray negative
Nonaccidental trauma consideration when appropriate
Inconsistent history
Multiple injuries or delayed presentation
Background
Epidemiology
Frequency and distribution
Carpal fracture distribution
Scaphoid approximately 60-70% of carpal fractures
Triquetrum approximately 15-20% of carpal fractures
Remaining carpal bones less common individually
Typical demographics
Scaphoid fractures common in adolescents and young adults
FOOSH as predominant mechanism
Sport associations
Hook of hamate in bat and racquet sports
Trapezium in thumb axial load injuries
Pathophysiology
Anatomic risk features
Scaphoid blood supply vulnerability
Retrograde flow to proximal pole
Proximal pole AVN risk increased
Carpal instability mechanisms
Ligament disruption progression in perilunate injuries
Median nerve compression in lunate dislocation
Injury pattern mapping
FOOSH with extension and radial deviation
Dorsal triquetrum avulsion with wrist extension
Hook of hamate fracture with handle impact
Therapeutic Considerations
Management rationale
Early immobilization in occult scaphoid suspicion
Nonunion risk reduction
Pain control and protection
Displacement thresholds and surgery
Displaced scaphoid waist fractures often operative candidates
Proximal pole fractures higher nonunion and AVN risk
Perilunate injuries as time-sensitive
Reduction urgency to protect median nerve
Definitive fixation often required
Evidence framing
Advanced imaging to confirm occult scaphoid fracture supported by improved diagnostic accuracy and reduced unnecessary immobilization
Procedural sedation safety practices align with ACEP procedural sedation policy principles (ACEP Level B or C depending on element)
Patient Discharge Instructions
Copy discharge instructions
Discharge instructions package
Immobilization care
Keep splint clean and dry
Do not insert objects into splint
Check fingers for color and swelling several times daily
Swelling control
Elevation above heart level
Ice over splint if tolerated
Finger motion encouraged if not restricted
Pain plan
Acetaminophen per label dosing
NSAID use if no contraindication and appropriate for patient
Opioid only if prescribed and shortest duration
Activity restrictions
No lifting with injured hand
No sport or gripping until cleared
Return to ED immediately
Increasing pain not controlled
New numbness or tingling
Fingers turning pale, blue, or cold
Increasing swelling with tight splint
Inability to move fingers
Fever or drainage from wound
Follow-up plan
Hand surgery or orthopedics within 3-7 days for suspected scaphoid or any confirmed carpal fracture
Earlier follow-up within 24-48 hours for worsening symptoms or neuro complaints
Advanced imaging appointment if X-ray negative but high suspicion
References
Clinical guidelines and core sources
Reference set
AAOS and specialty society guidance on wrist and hand fractures
Operative indications for displaced scaphoid fractures
Follow-up and imaging recommendations for occult scaphoid
British Society for Surgery of the Hand guidance for scaphoid and carpal injuries
Immobilization strategies
Advanced imaging pathways
ACEP procedural sedation clinical policy and safety recommendations
Monitoring standards
Airway preparedness
ATLS principles for trauma evaluation when high-energy mechanism present
Secondary survey completion
Imaging beyond wrist when indicated
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SymptomDx is an educational tool for medical professionals. It does not replace clinical judgment. Verify all clinical data and drug dosages with authoritative sources.