01Approach to the Critical Patient/attcp50

Immediate priorities

›Neurovascular compromise recognition

›Diminished or absent radial pulse at the thumb

›Urgent vascular surgery consultation

›Doppler assessment of digital perfusion

›Sensory deficit in superficial radial nerve distribution

›Two-point discrimination testing

›Comparison to contralateral thumb

›Capillary refill > 2 seconds at the thumb

›Emergent reduction if vascular compromise

›Warm ischemia time tracking

›Open fracture identification

›Skin breach over thumb base or CMC joint

›Wound irrigation and sterile dressing

›Tetanus prophylaxis assessment

›If open fracture, IV antibiotics within 1 hour

›Cefazolin 2 g IV for Gustilo Type I or II

›Add Gram-negative and anaerobic coverage for Type III

›Emergent hand surgery or orthopedic consultation

›Operative debridement planning

›Wash-out timing target within 6 hours

Key concepts and stabilization

›Deforming forces in Bennett fracture

›Abductor pollicis longus pulls metacarpal shaft proximally and radially

›Unstable even after closed reduction

›Cannot be reliably held with cast alone in most cases

›Adductor pollicis drives shaft into adduction

›First web space narrowing risk

02History/hx51

Mechanism and presentation

›Mechanism of injury

›Axial load on a partially flexed thumb

›Punching with clenched fist

›Fall onto outstretched hand

›Contact sports and equipment-related

›Ski pole impact

›Ball impact in football and rugby

›Timing of injury and any prior treatment attempts

›Delayed presentation > 2 weeks more difficult to reduce

›Prior immobilization and compliance

›Symptom complex

›Pain localized to the thumb base and CMC joint

›Aggravated by grip and pinch

›Pain with axial loading of the thumb

›Swelling and ecchymosis at thenar eminence

›Visible deformity with thumb shortening

›Adduction posture of the thumb

›Functional limitation

›Inability to pinch or oppose

›Loss of grip strength

Risk factors and context

›Patient demographics and activity profile

›Young males most commonly affected

›Mean age approximately 30 to 33 years

›Predominantly male

›Occupation and hand dominance

›Manual laborers require anatomic restoration

03Physical Exam/exam55

Vitals and general

›Systemic assessment in trauma context

›Heart rate and blood pressure

›Tachycardia suggesting significant pain or occult injury

›Hemodynamic compromise from polytrauma

›Mechanism-directed screening

›High-energy mechanism warrants broader trauma assessment

›Falls in elderly may warrant hip and wrist screening

Hand and thumb exam

›Inspection

›Swelling and ecchymosis over thenar eminence and thumb base

›Visible deformity with proximal and radial shift of metacarpal

›Adduction posture of thumb

›Skin integrity

›Open wound or puncture

›Fight bite or contaminated wound

›Palpation

›Point tenderness over the base of the first metacarpal

›Tenderness over the CMC joint

›Crepitus with gentle axial loading

›Anatomical snuffbox tenderness

›Scaphoid fracture co-assessment

›Trapezium fracture co-assessment

›Special tests

›Axial grind test

›Axial compression with rotation of the thumb metacarpal

›Pain and instability at the CMC joint

›CMC joint range of motion

04Differential Diagnosis/ddx49

Intra-articular fractures of the thumb base

›Bennett fracture

›ICD-10 S62.211A initial encounter

›Two-part fracture dislocation

›Ulnar beak fragment plus metacarpal shaft subluxation

›Inherently unstable due to deforming muscle forces

›Surgical fixation is standard of care for displaced fractures

›Rare non-displaced variants may be managed with casting

›Rolando fracture

›ICD-10 S62.211A with comminution specifier

›T-shaped or Y-shaped intra-articular fracture

›Multiple fragments with worse prognosis

›Distinguishing feature is comminution

›CT required to characterize fragment pattern

›May require ORIF, external fixation, or primary arthrodesis

Extra-articular and adjacent fractures

›Extra-articular fracture of the first metacarpal base

›ICD-10 S62.211A variant

›Does not involve joint surface

›More forgiving of residual angulation due to CMC compensatory motion

›More amenable to conservative management

›Acceptable angulation up to 20 to 30 degrees in some references

›Close radiographic follow-up at 1 week

›Trapezium fracture

›ICD-10 S62.171A

›Vertical intra-articular fracture of the trapezium

›Can coexist with Bennett fracture

›Snuffbox and trapezium ridge tenderness

05Laboratory Tests/lt24

Routine labs

›Isolated closed Bennett fracture

›Routine labs generally not indicated

›No infection or metabolic emergency

›Clinical diagnosis supported by imaging

›Inflammatory markers if open fracture or infection concern

›White blood cell count and differential

›C-reactive protein as baseline

Preoperative labs

›If surgical fixation planned

›Complete blood count

›Hemoglobin and platelet assessment

›Baseline before any regional block

›Basic metabolic panel

›Renal function for contrast or antibiotic dosing

›Electrolyte assessment

›Coagulation studies if anticoagulation or bleeding history

›INR and PTT

›Antiplatelet drug history review

Procedural sedation labs

›If procedural sedation required for reduction

›Blood glucose point-of-care

›Diabetes history assessment

›Hypoglycemia exclusion

›ECG if cardiac history

›Arrhythmia risk assessment

›QT prolongation baseline

06Diagnostic Tests/dt71

Scoring Systems

›Gedda classification of Bennett fractures

›Type 1: large ulnar fragment with CMC joint subluxation

›Most common pattern

›Amenable to CRPF if reducible

›Type 2: impaction fracture without subluxation

›May be more stable

›Closer follow-up with casting possible

›Type 3: small avulsion fragment with CMC dislocation

›High instability

›Surgical stabilization typically required

›Eaton-Littler classification

›Used for grading post-traumatic CMC arthritis on follow-up

›Stage I to IV based on joint space and osteophytes

›Guides long-term surgical planning

›Not an acute ED scoring tool

›Relevant for specialist follow-up

›Correlation with functional outcomes

MRI

›MRI indications in Bennett fracture

›Generally not required in acute setting

›Plain radiographs and CT sufficient for fracture characterization

›MRI reserved for specific clinical questions

›Ligamentous injury assessment

›Deep anterior oblique ligament (beak ligament) assessment

›UCL of MCP joint if combined injury suspected

›Occult fracture evaluation

›Negative plain films with persistent clinical suspicion

07Disposition/dispo37

Admission and operative indications

›Emergent admission and operative indications

›Open fracture with contamination

›Operative washout within 6 hours

›Admission for IV antibiotics

›Neurovascular compromise

›Emergent reduction and vascular surgery consultation

›Admission for monitoring after reduction

›Failed closed reduction with ongoing instability

›Operative fixation planning with hand surgery

›Admission if no rapid outpatient OR access

›Operative indications in admitted patients

›Articular step-off greater than 1 to 2 mm after reduction

›Closed reduction and percutaneous pinning as first-line approach

›ORIF for irreducible fragments or failed CRPF

›Intraoperative fluoroscopy inadequate for assessment

›Arthroscopically assisted fixation consideration

›Better articular visualization than fluoroscopy alone

Discharge criteria and follow-up

›Safe discharge criteria

›Closed fracture with adequate splinting

›Thumb spica splint applied correctly

›Neurovascular exam intact after splinting

›Pain adequately controlled with oral analgesia

›Able to take oral medications

›Reliable patient and caregiver

›Hand surgery or orthopedic follow-up arranged

›Follow-up within 5 to 7 days

08Treatment/t96

Analgesia and regional anesthesia

›Acute pain management

›NSAIDs for moderate pain

›Ibuprofen 400 to 600 mg orally every 6 to 8 hours

›Ketorolac 15 to 30 mg IV or IM in ED

›Acetaminophen as adjunct

›500 to 1000 mg orally every 6 hours

›Maximum 4 g per 24 hours

›Opioids for severe pain as bridge only

›Short course with clear taper plan

›Avoid at discharge in favour of NSAIDs and acetaminophen

›Regional anesthesia for reduction

›Hematoma block

›Lidocaine 1% 5 to 10 mL injected into fracture haematoma

›Wait 5 to 10 minutes before manipulation

›Radial nerve block at anatomical snuffbox

›Superficial radial nerve block for thumb anaesthesia

›5 to 10 mL of 1% lidocaine subcutaneously

›Procedural sedation if needed

›Ketamine 1 to 1.5 mg/kg IV for dissociative sedation

›Monitoring and resuscitation equipment at bedside

Closed reduction technique

›Reduction manoeuvre

›Longitudinal traction on the thumb

›Counter-traction at the wrist

›Correct adduction deformity during traction

›Pronation and abduction of the thumb metacarpal

›Directs shaft back toward the fixed beak fragment

›Simultaneous direct pressure over the base

›Fluoroscopic or post-reduction radiographic confirmation

›Articular step-off assessment after reduction

›Neurovascular re-assessment after reduction

›Post-reduction splinting

›Thumb spica splint in position of function

›Thumb in palmar abduction

›MCP and CMC immobilized

›Radiograph in cast or splint

›Confirm maintained reduction

›Assess for displacement in immobilization

Surgical fixation

›Closed reduction and percutaneous pinning (CRPF)

›Preferred first-line surgical approach for displaced fractures

›Systematic review data support CRPF over ORIF

›Lower fixation failure rate 2.9% versus 8.2% for ORIF

›K-wire placement technique

›K-wire across fracture and/or across CMC joint

›Fluoroscopic guidance for wire placement

›Post-CRPF management

›Thumb spica cast or splint 4 to 6 weeks

›K-wire removal at 4 to 6 weeks in clinic

›Open reduction and internal fixation (ORIF)

›Indications for ORIF

›Irreducible fractures by closed means

›Large fragment amenable to lag screw fixation

›Failed closed reduction attempt

›ORIF technique

›Wagner approach (volar approach) for access

›Interfragmentary screw or mini-plate fixation

›ORIF post-operative care

›Thumb spica splint 4 to 6 weeks

›Earlier mobilization with screw fixation versus K-wires

›Arthroscopically assisted percutaneous fixation

›Advantages over open surgery

›Better articular visualization than fluoroscopy

›Shorter immobilization time

›Outcome data

›Fewer complications compared to open surgery

›Better return-to-work rates reported

›Specialist technique requiring experienced hand arthroscopist

›Not universally available

›Appropriate for selected displaced fractures

Non-operative management

›Casting for non-displaced or minimally displaced fractures

›Criteria for conservative management

›Articular step-off less than 1 mm

›Stable reduction on post-manipulation films

›Thumb spica cast application

›4 to 6 weeks of immobilization

›Radiographs at 1 week to detect late displacement

›Limitation of non-operative treatment

›Most Bennett fractures are unstable and displace in cast

›Requires close follow-up and low threshold to convert to surgery

›Radiographic union timeline

›Fracture union typically achieved at approximately 5 weeks

›Clinical healing may precede radiographic union

›Hand therapy initiated after removal of immobilization

Antibiotics for open fractures

›Gustilo-Anderson Type I and II

›Cefazolin 2 g IV every 8 hours

›Continue until wound closure or 24 hours post-operative

›Adjust dose for renal impairment

›Tetanus prophylaxis assessment

›Toxoid if not current

›Immunoglobulin if unimmunized and contaminated wound

›Gustilo-Anderson Type III

›Cefazolin 2 g IV plus gentamicin 5 mg/kg IV daily

›Gentamicin renal function monitoring

›Add penicillin G or metronidazole for farm or fecal contamination

›Duration per institutional protocol and wound closure

›Minimum 24 to 72 hours post-operative

›Infectious disease consultation for complex cases

09Special Populations/sp48

Pregnancy

›Pregnancy considerations in Bennett fracture

›Imaging approach

›Plain radiographs acceptable with fetal shielding

›CT scanning when clinically required for surgical planning

›Radiation risk to fetus from extremity radiographs is very low

›Hand and wrist exposures well below threshold doses

›Document clinical necessity and shielding

›Anaesthesia and analgesia considerations

›Regional blocks preferred over systemic opioids

›Lidocaine for nerve blocks safe in pregnancy

›NSAIDs caution in pregnancy

›Avoid in first trimester and after 30 weeks gestation

›Acetaminophen preferred for analgesia

›Surgical timing

›Elective fixation may be deferred to second trimester when possible

›Emergent fixation for open fractures or vascular compromise

Geriatric

›Older adult considerations

›Mechanism assessment

›Low-energy mechanisms may indicate underlying osteoporosis

›Falls workup and home safety assessment

›Bone quality and healing

›Osteoporosis increases fixation failure risk

›Dual-energy X-ray absorptiometry referral if not recent

›Medication review

›Anticoagulation status affects operative planning

›NSAIDs caution with renal impairment and cardiovascular risk

10Background/b68

Epidemiology

›Incidence and demographics

›Most common intra-articular fracture of the hand

›Constitutes the majority of thumb base fractures

›Predominantly affects young males

›Mean age at injury approximately 30 to 33 years

›Athletic and occupational contexts predominate

›Male predominance across published series

›Sport and activity distribution

›Boxing and combat sports most common

›Skiing, football, and rugby well represented

›Outcomes and long-term burden

›Radiographic CMC arthritis common at long-term follow-up

›Reported in up to 100% at 6 years regardless of fixation method

›Most patients remain functionally asymptomatic with adequate treatment

›Functional outcomes with surgical treatment

›Pinch and grip strength recovery to 90 to 98% of contralateral side

›Recovery timeline 4 to 6 months

›DASH scores excellent with adequate treatment

›Mean DASH 3.0 to 8.8 in published series

›Patient satisfaction 87 to 94% reported

Pathophysiology

›Anatomical basis of instability

›Deep anterior oblique ligament (beak ligament) anatomy

›Inserts on the volar ulnar base of the first metacarpal

›Restrains the ulnar beak fragment in position

›Deforming muscle forces

›Abductor pollicis longus inserts on radial base of first metacarpal

›Pulls the shaft proximally radially and dorsally

›Adductor pollicis contribution

›Adducts the metacarpal shaft

›Produces first web space narrowing

›Fracture mechanics

›Axial loading on partially flexed thumb concentrates force at CMC joint

›Volar ulnar corner fractures as the beak fragment

›Articular surface incongruity from shaft subluxation

›Instability drives deformity progression

›Muscle forces overcome splint forces without fixation

›Explains high failure rate of conservative management alone

›Post-traumatic arthritis mechanism

›Articular cartilage damage from step-off and instability

›Step-off greater than 1 to 2 mm associated with early arthritis

›Persistent instability accelerates cartilage loss

›Adduction deformity correlation with symptomatic arthritis

›Residual adduction contracture associated with arthritis development

›First web space restoration is important outcome target

Therapeutic Considerations

›Evidence base for treatment approach

›Conservative management appropriate only for rare non-displaced fractures

›Most displaced fractures require surgery

›CRPF preferred over ORIF based on systematic review data

›Articular reduction goal

›Step-off target less than 1 to 2 mm to reduce arthritis risk

›Fluoroscopy alone underestimates residual step-off

›Arthroscopically assisted fixation emerging evidence

›Superior articular assessment over fluoroscopy

›Better return-to-work rates in published series

›Rehabilitation principles

›Early hand therapy after pin or hardware removal

›Range of motion exercises starting at 4 to 6 weeks

›Strengthening program from 6 to 8 weeks

›Return to activity timelines

›Light activities at 6 to 8 weeks

›Full return to contact sport or manual labor at 3 to 6 months

›Prevention of long-term complications

›Anatomic reduction reduces arthritis risk

›Not all patients with arthritis become symptomatic

›Functional rehabilitation key regardless of radiographic outcome

›First web space maintenance

›Thumb abduction exercises prevent adduction contracture

›Splinting in abduction position during immobilization

11Patient Discharge Instructions/pdi37

copy discharge instructions

›Bennett fracture home care instructions

›Keep the thumb spica splint clean and dry

›Do not remove the splint unless instructed by your doctor

›Use a plastic bag or waterproof cover when showering

›Elevate the hand above heart level as much as possible

›Reduces swelling and pain

›Especially important for the first 48 to 72 hours

›Apply ice wrapped in a cloth for 20 minutes every 2 to 3 hours

›Do not apply ice directly to skin

›Continue for first 48 hours

›Pain management at home

›Take ibuprofen 400 to 600 mg with food every 6 to 8 hours as needed

›Maximum 2400 mg per day

›Avoid if kidney problems or stomach ulcer history

›Take acetaminophen 500 to 1000 mg every 6 hours as needed

›Maximum 4 g per 24 hours

›Do not combine with other acetaminophen-containing products

›Use both medications together for better pain control if needed

›Alternate on a schedule rather than waiting for severe pain

›Follow-up instructions

›Hand surgery or orthopedic appointment within 5 to 7 days

›Do not miss this appointment as surgery may be required

›Bring all imaging done in the emergency department

›Repeat X-rays will be done at your follow-up visit

›To check that the fracture has not shifted

›Report any increase in pain or new deformity before your appointment

›Warning signs requiring immediate return to emergency

12References/r24

Guidelines and key sources

›Primary literature

›Carlsen BT, Moran SL. Thumb Trauma: Bennett Fractures, Rolando Fractures, and Ulnar Collateral Ligament Injuries. Journal of Hand Surgery 2009

›PubMed PMID 19411003

›Classification and treatment overview

›Kang JR, Behn AW, Messana J, Ladd AL. Bennett Fractures: A Biomechanical Model and Relevant Ligamentous Anatomy. Journal of Hand Surgery 2019

›PubMed PMID 29891266

›Biomechanical basis and ligamentous anatomy

›Liverneaux PA, Ichihara S, Hendriks S, Facca S, Bodin F. Fractures and Dislocation of the Base of the Thumb Metacarpal. Journal of Hand Surgery European Volume 2015

›PubMed PMID 25311936

›Treatment outcomes and surgical techniques

›Systematic review and outcomes data

›Systematic review comparing CRPF versus ORIF for Bennett fractures

›Fixation failure rate 2.9% CRPF versus 8.2% ORIF

›Comparable functional outcomes between methods

›Long-term follow-up data

›Radiographic arthritis up to 100% at 6 years

›Mean DASH 3.0 to 8.8 in surgical series

›Coding and classification references

›ICD-10 S62.211A Bennett fracture of right thumb initial encounter

›ICD-10 S62.212A Bennett fracture of left thumb initial encounter

›Gedda classification Types 1 2 and 3

›Eaton-Littler staging for CMC osteoarthritis

›Stages I through IV on follow-up radiographs

›Used for long-term arthritis assessment and surgical planning

Evidence & Review

Evidence & Review