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ABOS-boards > Trauma > Flashcards

Trauma Flashcards

1
Q

Abx prophylaxis
1 - Gustillo grade I injuries?
2- Grade 2?
3 - Grade 3?

A

Grade I/II : 1st gen cephalosporin
Grade III: cephalosporin + amino glycoside
Add PCN for farm injuries or bowel contamination (clostridium)

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2
Q

Class I shock (% blood loss/mL)?
Class II-% loss and sx?
Class III?
Class IV?

A

Class I: 15%, <750 mL

Class II: 15-30%, 750-1500 mL, HR increases, Tx w/ fluid

Class III: 30-40%, 1500-2000 mL, HR >120, deceased BP, urine decreased, decreased pH, Tx with fluid AND blood

Class IV: >40%, >2000 mL, >140 BPM, negligible urine, lethargic/coma, tx w/ fluid and blood

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3
Q

Adequate resuscitation markers - Lactate? gastric mucosal pH? base deficit?

A

Serum lactate: <2.5 mmol/L
Gastric mucosal pH: >7.3
Base deficit: -2 to +2

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4
Q

Highest risk of viral transmission following blood trasfusion - Hep C, Hep B, HIV?

A

Hep B - 1 : 205,000
Hep C - 1: 1.8 million
HIV - 1 : 1.9 million

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5
Q

Indications for DCO?

A 
GCS <8
Bilateral femoral fx
Multiple injuries with severe pelvic/abdominal trauma and hemorrhagic shock
Pulmonary contusions
Hypothermia <35 C
Head injury
IL6 over 500 pg/dL
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6
Q

What is acute inflammatory window after trauma?

A

2 to 5 days after injury, surge of inflammatory markers

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7
Q

Parameters for Early Appropriate Care?

A

Lactate <4.0 mol/L
ph > 7.3
Base excess > -5.5

Try to fix spine/pelvis/femur/tab w/in 36 hours

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8
Q

Adults or children have a more robust inflammatory response after trauma? What system affected first for each?

A

Adults more robust initial inflammatory response

Adults: Pulmonary
Children: dampened initial, then affects all organs simultaneously

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9
Q

Low velocity vs high velocity GSW (m/s, type of Gustillo injury)

A

Low velocity: <350 m/s or <2000 ft/s (handguns); Gustillo I or II
High velocity: >600 m/s or >2000 ft/s, Gustillo Type III; assault rifles/hunting rifles

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10
Q

Indications for surgery after GSW

A 
Articular involvement
unstable fx
Presentation >8 hrs after GSW
Tendon involvement
Superficial fragment in palm or sole
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11
Q

Retained bullet in lumbar spine w/o neuro deficits and perforated bowel - Tx?

A

IV broad spectrum abx for 7 days

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12
Q 
% increase with:
1- Syme
2- BKA (long vs short)
3- Vascular BKA
4: AKA
A 
Syme: 15%
BKA long: 10%
BKA short: 40%
Vascular BKA: 40%
AKA: 68% trauma, 100% vascular
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13
Q

Wound healing after amp - good prognosis?

A

TcPO2 >30
ABI >0.45
Total lymphocyte count >1500
Albumin > 3.0 g/dL

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14
Q

Treatment for post amputation neuroma? Phantom limb pain

A

Neuralgia: Target muscle regeneration (TMR)

Phantom pain: mirror therapy

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15
Q

Contraindications to HBOT

A

History of COPD - blebs
Hx of bleomycin Tx - pneumonitis
Pneumothorax
Insulin pump - malfunction or deformation of device under pressure

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16
Q

After BKA, removal of dog ears damages what arteries for flap?

A

Sural and saphenous arteries

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17
Q

Hip fx mortality at 1 month and 1 year

A

1 month: 6%

1 year: 30%

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18
Q

Hip fx pt with head injury, ISS >25, hip fx and requires intubation in trauma bay. What is greatest risk of mortality at 1 year?

A

Intubation: in hospital 10%, 1 year 79% morality
Head injury 1 year 51%
hip fx: 6% and 30%
ISS: 73% at one year

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19
Q

Block to use to decrease opioid usage, delirium and length of stay for hip fx?

A

Fascia iliaca block

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20
Q

muscles of anterior leg compartment? Nerve? Vessel?

A

Tib ant, EHL, EDL, PT
Nerve: Deep peroneal
Vessels: Anterior tib vessels

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21
Q

Lateral leg muscles? Nerve?

A

Peroneus longus and brevis

Nerve: Superficial peroneal

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22
Q

Deep posterior leg muscles? Nerve? Vessels?

A

Popliteus, FHL, FDL, Posterior tib
Nerve: Tibial nerve
Vessel: posterior tib vessel

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23
Q

Superficial posterior leg muscles? Nerve?

A

Gastroc, soleus, plantaris

Nerve: Medial sural cutaneous nerve

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24
Q

Position of foot for least pressure in leg compartments while in cast?

A

Resting platarflexion

30-50% less pressure

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25
Q

Signs of pediatric compartment syndrome?

A

Analgesia requirements, agitation, anxiety

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26
Q

Saline load test for knee: 95% sensitivity? 99%?

A

95%: 155 mL

99: 175 mL

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27
Q

Tx of gonococcal septic arthritis?

A

3rd gen cephalosporin (ceftriaxone), PCN and tetracyclines not effective 2/2 resistance

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28
Q

Types of Necrotizing fasciitis: Type 1? Type 2? Type 3? Type 4?

A

Type 1: Polymicrobial, most common 80-90%, seen in DM, cancer
Type 2: Monomicrobrial (GAS), 5% cases, seen in healthy patients
Type 3: Marine vibrio vulnificus, marine exposure
Type 4: MRSA

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29
Q

LRINEC scoring system

A 
Score >6 92% of nec fasc
CRP >150 = 4 pts
WBC <15 = 0, 15-25 = 1, 25+ =2
Hb >13.5 = 0, 11-13.5 =1, <11 = 2
Na <135 = 2
Cr >141 = 2
Glucose >10 (mmol/L) = 1
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30
Q

Abx tx for nec fasc?

A 
Generally polymicrobial
PCN
Aminoglycoside
Metronidazole
Clindamycin
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31
Q

Cierny-Mader classification for osteomyelitis (Anatomic location and host)

A

Anatomic location
Stage 1: Medullary
Stage 2: Superficial/cortical
Stage 3: Localized (medullary and cortical)
Stage 4: Diffuse (entire bone w/ bone loss)

Host type
Type A: normal
Type B: Compromised
Type C: Tx worse than infection

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32
Q

Def of sequestrum and involucrum?

A

Sequestrum: Devitalized bone that serves as infxn nidus
Involucrum: New bone around area of bony necrosis

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33
Q

How does VAC improve wound bed?

A

Decreases after load in capillary bed
Dilates arterioles - proliferation of granulation tissue
Removes interstitial fluid (contain inhibitory factors that suppress formation of fibroblasts, vascular endothelial cells)
Eliminates superficial purulence (Reduces anaerobic colonization
Removal excess fluid - maintains osmotic gradient

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34
Q

Biofilm process - 2 stages

A

Step 1: Adhesion, regulated by adhesions
After several bacteria attached –> step 2 –> quorum sensing/cell to cell communication
Allows maturation of biofilm and expression of genes that activate virulence factors

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35
Q

Preganglionic brachial plexus injuries - definition? Symptoms/signs?

A

Avulsion proximal to DRG - involves CNS - no regen
Horner’s syndrome - sympathetic chain disruption
Winged scapula medially - loss of serrates (long thoracic n), rhomboids (dorsal scapular n)
Motor deficits - flail ext
Sensory intact
Normal histamine test - C8-T1 sympathetic ganglion

EMG shows loss of innervation of cervical paraspinals

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36
Q

Postganglionic brachial plexus findings?

A

Involves peripheral nervous system - better prog
Sensory deficits
EMG shows maintained innervation of cervical paraspinals
Abnormal histmine test - redness and wheal but NO flare

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37
Q

Horner’s syndrome - Symptoms? When does happen after BPI? Which level?

A

Drooping of eyelid, pupillary constriction, anhidrosis
Happens ~3 days after injury
Disruption of sympathetic chain at c8 and/or T1 root avulsions

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38
Q

When to do immediate (<1 wk) surgical exploration of BPI?

A

Sharp penetrating trauma (except GSW)
Iatrogenic
Open injuries
Expanding hematoma or vascular injury

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39
Q

What is an Oberlin transfer?

A

Ulnar nerve used for upper trunk injury for biceps fxn

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40
Q

% femoral neck fx ass’d w/ femoral shaft fx?

A

6-9%

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41
Q

Mortality rate at 1 year after femoral neck fx? 2 year mortality in pts with renal failure?

A

1 year: 30%

2 year in pt w/ chronic renal failure: 45%

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42
Q

Major blood supply to femoral head in adult?

A

Medial femoral circumflex artery –> lateral epiphyseal artery
Anterior/inferior head from lateral femoral circumflex

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43
Q

Rate of osteonecrosis after hip fx? risk factors? Tx of osteonecrosis?

A

10-45%
Increased w/ increased initial displacement, non anatomic reduction
Tx: young pt: FVFG vs THA
Older: Hemi vs THA

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44
Q

Nonunion after hip fx rate? Risk factor? Tx?

A

5-30%
Increased w/ increased displacement, varies malreduction
Tx: valgus intertroch osteotomy (vertical fx to horizontal –> decreases shear)
FVFG (young pt w/ viable fem head)
Arthroplasty
Revision ORIF

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45
Q

When do hip fx fixation methods fail? Percentages of failure after fixation vs arthroplasty?

A

Most fail in first 2 years
Fixation 45%
Arthroplasty 8%

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46
Q

Higher failure after hip fx with cannulated screws or sliding hip screw?

A

Cannulated screws have HIGHER REOPERATION rates (not higher implant failure)
Esp for displaced, basicervical and current smokers

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47
Q

When do failure rates stabilize after hip fx operation?

A

ORIF/fixation and arthroplasty level off at 2 years, then no difference in ongoing failure rates

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48
Q

Risk factors for mortality after hip fx?

A

Male (37% at 1 yr vs 28%)
Older age
Increased comorbidities

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49
Q

What does Timed Up and Go (TUG) determine? Times at 4 days postop and 3 wks?

A

Need for walking aid
NOT independence of ADLs

4 days 58 sec (1 min)
3 wks 26 sec (30 sec)
Times above these predict need for walking aid at 2 years

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50
Q

Performing a valgus producing osteotomy for femoral neck nonunion. Currently at 40 degrees from horizontal, place pin at 130 degrees with planned 20 degree osteotomy. What angle for side plate?

A

150 deg
Guide insertion (130) + osteotomy (20) = side plate angle
Side plates available in 130 deg to 150 degrees

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51
Q

Risk for AVN after hip fx in young vs old? Men vs women?

A

Higher in those <60 (20%) vs 60-80 (12.5%) vs 80+ (2.5%)

Women 11% vs men 5%

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52
Q

When does mortality risk return to baseline after fem neck fx?

A

After 1 year returns to that of normal, age-matched controls

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53
Q

FRAX score factors?

A

Bone density of FEMORAL NECK (not spine)
Current smoking hx
Hx of parental hip fx
prior personal hx of fx before age 50

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54
Q

What other fx increases risk of hip fx at one year?

A

Proximal humerus fx

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55
Q

Risk factors for increased mortality after intertroch fx?

A 
Male gender (25-30%) vs female (20%)
Intertroch (vs FNF)
Age >85
comorbidities
ASA III and IV
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56
Q

Stable vs unstable intertroch?

A

Stable - intact posteromedial cortex (resists medial compressive loads when reduced)

Unstable - fx will fall into varus
Posteromedial comminution
Thin lateral wall (<20 mm suggests postop lateral wall fx)
Reverse obliquity
Subtract extension
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57
Q

What test to get with isolated greater trochanter hip fx?

A

MRI - eval for intertroch extension

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58
Q

4 hole vs 2 hole SHS for intertroch fx - which is better?

A

No difference clinically or biomechanically

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59
Q

Most common failure after intertroch implant fixation?

A

Implant failure and cutout

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60
Q

Risk factors for increased postop infection after tibia plateau ORIF?

A

OR time >3 hours

Open fx

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61
Q

Indications for clavicle operative intervention (absolute and relative)

A 
ABSOLUTE indications:
Open fx
Displaced with skin tenting
Subclavian artery/vein injury
Floating shoulder
Symptomatic nonunion/malunion
Relative indications
Displaced with >2cm of shortening
Bilateral clavicles
BPI
Polytrauma
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62
Q

Risk factors for nonunion of clavicle fx treated nonop?

A 
Comminution
>100% displacement
>2cm shortening
Elderly
Female
Lateral 1/3 fx (11% vs 4.5% midshaft)
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63
Q

Outcome of displaced mid shaft clavicle fx with >2cm shortening treated nonop?

A

1-5% nonunion

Decreased shoulder strength and endurance

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64
Q

Superior vs anteroinferior plating for clavicle fx: which is higher load to failure? Lower risk of neurovascular injury? Lower removal of deltoid?

A

Higher load to failure: Superior plating
Lower rate neurovasc injury? anteroinferior plating
Lower removal of deltoid attachment: Superior plating

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65
Q

Advantages of plating clavicle?

A

Improved results for fx >2cm shortening or 100% displacement
Improved functional outcomes and less pain w/ overhead
Faster time to union (16 wks vs 28 wks)
Decreased symptomatic maluinon rate
Better cosmoses
increased shoulder strength/endurance

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66
Q

Definition of clavicle malunion

A

Shortening > 3cm
Angulation >30 degrees
Translation >1 cm

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67
Q

% of clavicle plates that require removal?

A

30%

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68
Q

Nonop vs op clavicle fx: constant shoulder scores and DASH scores?

A

Improved in operative group at all time points

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69
Q

Operative indications for scapula fx?

A

Open fx
Loss of RC fun
coracoid w/ >1 cm displacement

Glenopolar angle <22 degrees

GH instability
displacement or >25% joint surface (instability)
>5mm glenoid articular step off

Scapular neck:
>1cm medial displacement
>40 degrees

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70
Q

Most common ass’d injury w/ scapula fx?

A

Rib fx

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71
Q

How to treat humerus nonunion?

A

Compression plating +/- bone graft (4.5 plate)

Superior to IMN

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72
Q

Where does radial nerve cross humeral diaphysis from: medial epicondyle? lateral epicondyle? Radiocapitellar joint?

A

Medial epicondyle: 20 cm proximal
Lateral epicondyle: 14 cm proximal
Radiocapitellar joint: 10 cm

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73
Q

Medial collateral ligament of elbow - origin and insertion? what does it restrain? when is it tight?

A

Anterior bundle originates from distal medial epicondyle, inserts onto sublime tubercle
Restrain to valgus (30-120 deg)
Tight in pronation

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74
Q

Lateral collateral ligament of elbow - origin and insertion? what does it restrain? when is it tight?

A

Originates from distal lateral epicondyle and inserts onto wrist supinatorus
Stabilizes against posterolateral rotational instability (PRLI)
Tight in supination

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75
Q

Pt has distal humerus fx, Y-type, requiring ORIF w/ pre-existing ulnar neuropathy, unchanged after injury: parallel or orthogonal plates? Decompress nerve?

A

Parallel plates has greater construct rigidity
Every screw pass thru plate, each screw as long as possible, screws should interdigitate, each screw through as many articular fragments as possible

Decompress nerve (in situ) if previous Sx or if hardware comes in contact with nerve (transposition)

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76
Q

Describe olecranon osteotomy length of osteotomy, apex distal or proximal?

Screw direction into ulna?

A

Chevron osteotomy apex distal 2cm

Cancellous screw slightly MEDIAL due to various bow of primal ulna

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77
Q

What surfaces of humerus place plate for distal humerus fixation if using orthogonal plates?

A

Posterolateral and medial surfaces

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78
Q

How to address lack of flexion at elbow after distal humerus fx with fracture united?

A

Open release of posterior bundle of MCL and excision of osteophytes
Posterior capsule if nec

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79
Q

Long K wire for olecranon osteotomy can affect which nerve?

A

AIN - thumb IP flexion

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80
Q

Predictors of humeral head ischemia after proximal humerus fx?

A

<8 mm cal car length attached to articular segment
Disrputed medial hinge
Displacement >1 cm
Angulation >45 deg

NOT the same as developing AVN

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81
Q

What is major blood supply to humeral head?

A

Posterior humeral circumflex artery
Takes off more distally than anterior humeral circumflex artery

Anterior circumflex goes to anterolateral ascending branch and ARCUATE artery –> main supply to greater tuberosity

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82
Q

What determines if proximal humerus fx has separate “parts” for Neer classification?

A

Displacement >1cm

45 deg angulation

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83
Q

Determination of humerus plate pullout strength (measurement)

A

Medial + lateral combined cortical thickness >4mm

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84
Q

ORIF indications for proximal humerus fx

A

1- Greater tuberosity displaced >5 mm (impingement casting loss abduction and ER)
2- 2, 3, or 4 pt fx in young pt
3- Head splitting fx in young patient

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85
Q

Most common complication of ORIF of proximal humerus fx?

A

Screw cut out

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86
Q

How to prevent varus collapse in ORIF of proximal humerus fx?

A

Inferomedial cal car screw in osteoporotic bone

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87
Q

Proximal humerus fx: How far below articular surface of hemiarthoplasty should place getter tuberosity?

How to best determine height of prosthesis?

A

10 mm

determine height of prosthesis from superior edge of pec tendon –> 5.6 cm between top of humeral head and superior edge of pec tendon

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88
Q

Best predictor of successful outcome after hemiarthroplasty for proximal humerus fx?

A

Anatomic healing of tuberosities

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89
Q

Acceptable criteria for humerus alignment?

A

<20 deg anterior angulation
<30 deg varus/valgus
<3 cm shortening

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90
Q

Risk factor for nonunion in nonop tx of humerus fx?

A

Proximal 1/3 spiral or oblique fx patterns

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91
Q

Absolute Indications for ORIF for humerus fx?

Relative?

A 
Absolute:
Open fx
Vascular injury
Floating elbow
BPI
Compartment syndrome
Periprosthetic humeral shaft fx at the tip of stem

Relative:
Bilateral humerus fx
Polytrauma
Path fx

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92
Q

Weight bearing after plate fixation of humerus fx?

A

Full crutch weight bearing has no effect on union

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93
Q

Humeral plating vs nailing - union rates? Complications? Shoulder pain? ASES scores? Nerve injury?

A 
Union rate = no difference
Complications = higher in IMN group
Shoulder pain = higher in IMN group
Functional shoulder scores (ASES) = SAME between two groups
Nerve injury = No difference
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94
Q

Time point to determine nonunion for humerus fx being treating nonop?

A

6 weeks w/o callous on XR and fx motion

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95
Q

Radial nerve palsy after humerus fx - % that improve? when do they improve?

When get EMG?
Which muscle comes back first?
Which comes back last?

A

8-15% overall, 22% w/ distal 1/3 fx

85-90% improve

Recovery at 7 weeks with full recovery at 6 months

EMG at 3-4 months

First muscle: brachioradialis
Last muscle: extensor indicis

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96
Q

Transfers for radial nerve palsy?

A

1: PT to ECRB
2: FCR to EDC (important to maintain FCU to generate ulnarly directed flexion)
3: PL to EPL

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97
Q

Which nerve to identify when doing posterior approach to humerus to trace to radial nerve?

A

Posterior antebrachial cuteanous nerve

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98
Q

When to perform excision and triceps advancement for olecranon fx?

A

Elderly pt w/ osteoporosis
Fx <50% joint surface
Nonunions

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99
Q

Most common issue with ORIF after olecranon fx?

A

Symptomatic hardware

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100
Q

Safe zone for hardware placement in radial head?

A

90 deg from radial styloid to Lister’s tubercle

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101
Q

Tx of radial head fx?

A

Short period of immobilization and early ROM for isolated minimally displaced fx with no mech block

ORIF vs resection vs arthroplasty for >2 mm step off or mechanical block

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102
Q

ORIF outcomes with radial head fx

A

Wore outcome with 3+ fragments

103
Q

Kocher approach to radial head - interval? Pros and cons?

A

Approach
ECU (PIN) and ancones (radial)

Less risk to PIN vs Kaplan
con: risk destabilizing elbow if capsule incision too posterior and LUCL violated

104
Q

Kaplan approach: interval? Pros and cons vs Kocher?

A

Approach
EDC (PIN) and ECRB (radial)

Pro: less risk disrupting LUCL and destabilizing elbow vs Kocher (more anterior approach)
Con: higher risk to PIN

105
Q

How to assess for overstuffing of radial head implant intraop?

A

Visually assess the LATERAL ulnohumeral joint for gapping (medial widening only seen after over lengthening radial head by 6+ mm)

106
Q

Arm position during approach for Kocher or Kaplan approach? During plate application?

A

Approach:
Arm fully pronated to protect PIN

Plate arm position: Neutral to judge bare area from Listers to radial styloid

107
Q

Elbow dislocation order of events?

A

Progress from lateral to medial
1-LCL fails (primary lesion) - gen avulsion from lateral epicondyle, but can be midsubstance
MCL fails last

108
Q

What position to splint an elbow dislocation after reduction?

When can go back to light duty?

A

At least 90 deg for 5-10 days, then therapy (early ACTIVE ROM)

Proceed with light duty at 2 weeks after injury

109
Q

What injuries are ass’d w/ posterior hip dislocation?

A

Ostenecrosis of femoral head
Posterior wall fx
femoral head fx
sciatic nerve injury

**Ipsilateral knee injury (up to 25%)

110
Q

Position of leg w/ posterior hip dislocation? Anterior?

A

Posterior dislocation
Flexion, adduction, IR

Anterior dislocation
Flexion, abduction, ER

111
Q

Thoracic aortic rupture is ass’d with what orthopedic injury?

A

Hip dislocation
8% of hip dislocation have aortic injury

Knee injury ass’d with high E hip dislocation in 93% cases on MRI

112
Q

Test to get after hip reduction in native hip?

A

CT scan

113
Q

How much blood can closed femoral shaft hold?

Tibial shaft?

A

Femoral shaft: 1000-1500 mL

Tibial shaft: 500-1000 mL

114
Q

Using piriformis nail at Troch start point for femoral nail will result in what deformity?

A

Varus

115
Q

Risk factors for rotational malunion in femoral shaft fx

A

Proximal fx (30% vs distal 10%)
Use of fx table - Internal rotation deformities
Fx comminution
Night time surgery

116
Q

highest union rate in femoral shaft nonunion with IMN?

A

Highest union is with plate augmentation and IMN retention

Plate fixation union 96% vs exchange nail 73%

Allows deformity correction

117
Q

Acceptable malrotation in femoral shaft fx?

A

<15 degrees

118
Q

Workup to determine if hip fx in pt with femoral shaft fx

A

1- Dedicated AP int rot XR
2- 2 mm/fine cut CT fem neck
3- Intraop fluoro lateral prior to fixation
4-Postop AP and lateral of hip before awakening pt

119
Q

Normal femoral neck anteversion?

A

10-25 degrees

120
Q

Proximal femoral fx develop what type of malrotation? Distal fx?

A

Prox fx: Internal malrotation (prox portino ER 2/2 short ext rot, so distal portion is relatively internally rotated)

Distal fx: Ext malrotation (distal frag pulled external rot 2/2 lateral gastroc and plantaris = ext rot)

121
Q

what type of femoral neck fx seen with ipsilateral femoral shaft fx?

A

Basicervical, vertical, nondisplaced

122
Q

why does indomethacin cause more nonunion than other NSAIDs?

A

Indomethacin works primarily on IGF-1 vs other on COX. IGF-1 important for bone healing

123
Q

Bisphosphonate subtroch fx characteristics?

A

Focal lateral cortical thickening
Transverse fx
Medial spike
Lack of comminution

124
Q

Bisphosphonate femoral fx issues with 1-nail, 2 plate vs conventional fx?

A

Nail - increased risk of iatrotrogenic fx

Plate: higher risk of hardware failure

125
Q

% of knee dislocations with peroneal nerve injuries?

A

25%

126
Q

% of unstable Weber B with syndesmotic injury?

A

~40%, reason for ext rot stress test intraop or Cotton

127
Q

Types of knee dislocations, mechanism, and ass’d injuries

A 
1. Anterior
Most common (30-50%), hyperextension injury
PCL tear
Arterial injury 2/2 intimal tear
HIGHEST rate of peroneal n injury
2. Posterior
2nd most common 30-40%
Axial load to flexed knee (dashboard)
HIGHEST rate of vascular injury
HIGHEST rate of complete popliteal tear
  1. Lateral or medial
    Varus or valgus force
    Lateral: ACL and PCL
    Medial: PLC and PCL
  2. Rotational
    Usually irreducible - condyle buttonhole through capsule
128
Q

Most common complication after knee dislocation?

A

Stiffness/arthrofibrosis (nearly 40%)

129
Q

Which tibial plateau fx’s are ass’d w/ lateral meniscus tear? Medial meniscus?

A

Lateral meniscus: Schatzker II, >10 mm articular depression
Joint widening >5 mm

Medial meniscus: Schatzker IV

130
Q

Which tibial plateau fx’s are ass’d w/ ACL injuries?

A

Type IV and type VI fx’s

131
Q

Which tibial plateau is more convex? Which is more distal?

A

More convex: lateral plateau

More distal: Medial plateau

132
Q

Strongest predictor of long term success after ORIF of tibial plateau?

A

Limb alignment

Joints stability

133
Q

Risk factors for infxn after tibial plateau ORIF?

A 
Male
Smoking
Pulmonary disease
Bicondylar
OR TIME >3 HOURS

Open fx
Fx requiring fasciotomy (but timing to definitive fixation does not increase infxn risk)

134
Q

Issue with definitive ex-fix for tibial plateau fx?

A

Inappropriately high risk of malunion rate

135
Q

What has highest compressive strength for filling metaphysical void after tibial plateau fx?

A

Calcium phosphate cement

136
Q

Does timing of definitive fixation for tibial plateau fx requiring fasciotomy have an impact on infection risk?

A

No - no difference if ORIF before fasciotomy, at time of fasciotomy, at fasciotomy closure or after closure

137
Q

What size screws for tibial plateau fx with a lateral buttress plate (Schatzker II)?

A
  1. 5 mm screws, nonblocking followed by locking (if osteoporotic)
  2. 5 mm and 6.5 mm have been shown to be inferior for sustains joint surface elevation (3.5 mm rafting screws better vs two 6.5 cancellous screws)
138
Q

Steps to fix terrible triad elbow injury?

A 
Deep to superficial
1-Coronoid ORIF if needed
2-Radial head
3-LCL
4- UCL/MCL if still unstable vs ex fix
139
Q

How to splint a terrible triad elbow injury - medial side intact? medial and lateral side disrupted?

A

Medial side intact
Flexion - Increases bony stability
Pronation: Most stable position, int. rot. torque applied to wrist causes ulna to pivot about intact medial side soft tissue of elbow and close gap on lateral side

Both disrupted: flexion and neutral rotation

140
Q

Components of interosseous membrane of forearm

A 
Central band - key portion to reconstruct
Accessory band
distal oblique bundle
Proximal oblique bundle
Dorsal oblique accessory band
141
Q

Ulnar shaft fx - nonop treatment criteria?

A

Isolated nondipslaced fx
Distal 2/3 ulnar shaft fx with:
1: <50% displacement
2: <10 degrees of angulation

96% union rate, but ok to fix due to long time to union

142
Q

Synostosis after BBFFx ORIF: rate? ass’d with what factor? When can HO be resected?

A

Rate: 3-9%

Ass’d w/ single incision approach

HO can be resected with low recurrence rate as early as 4-6 months post injury when XRT or indomethacin are used

143
Q

Risk of re-fracture after ORIF risk factors? When to remove? Brace afterwards?

A

Risk factors:
Removing plates too early (<15 months)
4.5 plates
Comminuted fx

Keep plates at least 15 months

Brace for 6 weeks and protect activity for 3 months after hardware removal

144
Q

Classic Henry approach to proximal radius: which direction for radial artery? supinator? arm in supination or pronation?

A

Radial artery medial
Supinator laterally (with PIN)
Arm in supination - displaces PIN away from dissection

145
Q

Distal radius fx, normal and acceptable criteria for: radial height? radial inclination? Articular stepoff? Volar tilt?

A

Radial height: nl = 13 mm, <5 mm shortening
Radial inclination: nl=23 deg, change <5 deg
Articular stepoff: nl= none, accept up to 2 mm
Volar tilt: nl 11 deg; dorsal angulation <5 deg or w/in 20 deg of contra

146
Q

Findings of syndesmotic injury:
Decreased tibiofib overlap (AP/mortise)
Medial clear space?
Increased tibiofib clear space?

A

Tibiofibular overlap
AP: >6 mm, mortise: >1 mm

Medial clear space: normal <4mm

Tibiofibular clear space
Meassure 1 cm above joint
Normal <6mm (AP and mortise)

147
Q

Supination adduction injury pattern

A

1: Talofib sprain or distal fib avulsion
2: vertical medial mal w/ impaction anteromedially

148
Q

SER ankle fx pattern?

A

1: Anterior tibiofibular ligament sprain
2: Fibula fx (anteroinferior to posterosuperior) vs PER (anterosuperior to posterior inferior)
3: PITFL rupture or posterior malleolus fx
4: Medial malleolus fx/disruption deep deltoid

149
Q

Pronation ABduction ankle fx pattern?

A

1- Medial malleolus transverse fx or deltoid disruption
2- ATFL sprain
3- High fibula fx, comminuted

150
Q

Pronation external rotation ankle fx pattern?

A

1-Medial malleolus transverse or deltoid disruption
2- ATFL disruption
3-Fib fx (anterosuperior to posteroinferior)
4- PITFL or posterior malleolus

151
Q

How much does tibiotalar contact pressure increase with 1 mm shift of talus?

A

42%

152
Q

Most important factor for satisfactory outcome after ankle ORIF?
Length of recovery?
Worse outcome characteristics?

A

Most important factor: anatomic reduction
Length of recovery: 2 years

Worse outcomes with:
Smoking
Decreased education
Alcohol use
Medial malleolus fx
153
Q

Postop rehab after ankle fx:
Time to braking normalized at?
How long after weight bearing?

A

Braking time normalizes at 9 weeks

Braking time significantly increased until 6 weeks after weight bearing in longer bone fx and periarticular fx’s

154
Q

Medial malleolus ankle fx fixation: which is better - lag by technique using 3.5 full threaded screw or partially threaded 4.0?

A

3.5 mm lag by technique

Increased insertional torque and lower rate of radiographic screw loosening

155
Q

When is it ok to use only lag screw fixation for lateral malleolus fx?

A

spiral pattern when screws can be placed at least 1 cm apart

156
Q

% of stiffness restored to syndesmosis when posterior malleolus is fixed vs isolated syndesmotic fixation?

A

70% with posterior malleolus

40% with syndesmotic fixation alone

157
Q

Hyperplantarflexion variant ankle fx injury pattern?

A

Vertical shear fx of posteromedial tibial rim

Spur sign = dbl cortical density of inferomedial tibial metaphysis

Fix with antiglare plating

158
Q

What direction is syndesmosis most unstable?

How to reduce syndesmosis with clamp/placement of clamp?

Where to angle screws?

A

Instability greatest in AP plane

Place reduction clamp on mid medial tibia and fibular ridge

Angle screws posterior to anterior 20-30 deg

159
Q

Differences in syndesmotic fixation methods?

A

No difference in RCT (Wikeroy 2010) in tricortical or quadricortical fixation

Worse outcomes with ass’d posterior malleolus fx, obesity, difference in syndesmotic width >1.5 mm, CT confirmed tib/fib synostosis

160
Q

Bosworth fracture dislocation

A

Rare fx/dislocation of ankle where fibula becomes entrapped behind tibia and becomes irreducible

Can cause compartment syndrome

161
Q

Ligaments of ankle syndesmosis

A

1-Anterior inferior tibiofibular ligament (AITFL)
From anterolateral tubercle of tibia (Chaput) to anterior tubercle of fibula (Wagstaffe)

2-Posterior-inferior tibiofibular ligament (PITFL)
Posterior tubercle of tibia (Volkmann) to posterior lateral malleolus
**Strongest component
Doesn’t tear during ankle fx

3-Interosseous membrane
4-Interosseous ligament
Distal continuation of IOM
Main restrain to proximal migration of talus

5-Inferior transverse ligament

162
Q

DRF ORIF indications?

A

1- XR finings indicating instability (pre-reduction XR)
2- Drosal angulation >5 deg or >20 deg of contralateral
3- volar or dorsal comminution
4- Displaced intra-articular fx > 2mm
5- Radial shortening > 5 mm
6- ulnar shaft f
7- Dorsal or volar Barton fx (volar ulnar corner sports volar lunate facet)
8- Loss of reduction in cast

163
Q

LaFontaine predictors of instability for DRF

A

Pt w/ 3+ factors have high chance of loss of reduction

  • Dorsal angulation >20 deg
  • Comminution
  • Initial displacement >1 cm
  • **Initial radial shortening >5 mm (most important)
  • Ass’d ulnar fx
  • Severe osteoporosis
164
Q

complications of closed tx of DRF?

A

Same overall outcome as ORIF

CTS
EPL rupture***

165
Q

What tendon ruptures with volar DRF ORIF? Risk factor?

A

FPL

Ass’d with plate placement distal to watershed area (most volar margin of radius closest to the flexor tendons)

166
Q

What nerve is at risk with distal radius spanning ex fix proximal pins?

A

Superficial radial nerve

167
Q

Treatment of EPL rupture in closed DRF?

A

EIP to EPL transfer

168
Q

Vit C dosage after DRF?

A

500 mg for 50 days

169
Q

what does shuck test test after ORIF of DRF? Which ligaments?

A

Assesses DRUJ after DRF fixation

Specifically tests radioulnar ligaments

170
Q

AAOS guidelines for treating DRF

A

1- ORIF for post reduction radial shortening >3 mm, dorsal tilt >10 deg, intra-articular step off 2 mm

2- Rigid immobilization for non op t

3 Use of true lateral to assess DRUJ

4 Begin early ROM of wrist after stable fixation

5 Use Vitamin C

171
Q

Contraindication to percutaneous pinning of DRF?

A

Volar comminution

172
Q

What nerve is at risk with retraction during volar approach to distal radius using FCR splitting approach?

A

Palmar cutaneous nerve
4-6 cm proximal to wrist crease
Travels between median nerve and FCR
Supplies thenar region

173
Q

Most stable construct in U type sacral fracture?

A

Triangular osteosynthesis/lumbopelvic fixation

174
Q

Chance of nerve injury with Denis 1, 2, 3 sacral fractures

A

Zone 1: 6%
Zone 2: 28%
Zone 3: 57%

175
Q

Distal 1/3 clavicle fx - important ligaments? Where do they insert? Which is stronger?

A

Conoid (medial) - 4.5 cm from end of clavicle
-strongest

Trapezoid (lateral) - 3 cm form end of clavicle

Provide primary resistance to superior displacement of lateral clavicle

176
Q

Which distal clavicle fx to operate on?

A

Neer Type IIA, IIB, V
IIA = fx medial to coracoclavicular ligaments w/ conoid and trapezoid intact (sig medial clavicle displacement)

IIB = fx between coracoclavicular ligaments (sig medial clavicle displacement)

Type V: comminuted fx pattern (not intra-articular which is type III)
Ligaments intact, sig medial displacement

Open Fx
Vascular injury
Floating shoulder

177
Q

Most common cause of death in lateral compression pelvis injury?

A

closed head injury

178
Q

Increased mortality after pelvic fx ass’d with?

A

1 - SBP <90 on presentation

2: >60 y/o
3: Need for transfusion >4 units**
4: APC III injury **

179
Q

Sexual dysfunction % after pelvic ring fx?

A

Up to 50%

180
Q

Poor outcome after pelvic ring fx ass’d with?

A 
SI incongruity of >1cm ***
LLD > 2cm***
High degree initial displacement
Malunion/nonunion
urethral injury
181
Q

Where does common iliac system begin?

Where does corona mortis connect?

A

Near L4 at bifurcation of abdominal aorta

Corona mortis (connection between obturator system from anterior division of internal iliac and external iliac/epigastric) at 6.2 cm from pubic symphysis

182
Q

Define APC injuries

A

APC I: Symphysis widening <2.5 cm

APC II: Symphysis widening >2.5 cm, anterior SI joint diastasic, posterior SI ligaments intact, sacrospinous and sacrotuberous disrupted

APC III: Disrupted posterior SI ligaments
Ass’d with vascular injury ***

Highest mortality***

183
Q

Lateral compression injuries

A

LC I: Ramus fx and ipsilateral anterior sacral ala compression fx

LC II: Rami fx and ipsilateral posterior ilium fx dislocation (crescent fx)

LC III: Ipsilateral LC and contralateral APC (windswept pelvis)

184
Q

Vertical shear pelvic ring injury

A

Ass’d with highest risk of hypovolemic shock (2/3)

Mortality rate 25% (less than APC III)***

185
Q

Radiographic signs of pelvic instability

A

> 5 mm displacement of posterior SI complex

Posterior sacral fx gap

Avulsion fx: ischial spine, ischial tuberosity, sacrum, TP of 5th lumbar**

186
Q

Causes of hemorrhage after pelvic ring fx

A

1: Venous (80%), shearing of posterior thin walled venous plexus

2: arterial 20%
- Superior gluteal artery most common (APC injury w/ posterior ring injury)***
- Internal pudendal (anterior ring LC injury)
- Obturator/LC injury

187
Q

Parturition induced diastasis tx?

A

<4cm diastasis: pelvic binder in acute setting and bedrest

> 4-6 cm: ORIF for chronic pain

188
Q

When is anterior and posterior ring stabilization required in pelvic ring fx?

A

Vertically unstable fx

189
Q

Urogenital injury w/ pelvic ring fx: how often? most common injury? When to get further tests? Tx? Most common long term complication?

A

1- about 20% in males (more common in males)

2- Most common injury: posterior urethral tear, less common = bladder rupture (extravasation aboard pubic symphysis, high mortality)

3- Get further testing (RUG) with blood at meatus, hematuria, high riding prostate

4- Tx: suprapubic Cath (conta’d in anterior ring plating cases), if need anterior plating then surgical repair at time of plating

5: Complications: urethral stricture (most common)***
Impotence
Infxn
Incontinence

190
Q

Most common nerve injury after INFIX?

A

1: LFCN ***

Can also injure femoral nerve***

191
Q

DVT and PE rate after pelvic ring fx?

A

DVT approx 60%
PE: 25%
Fatal PE approx 2%

192
Q

How to diagnose chronic instability of pelvic ring?

A

Single leg stance pelvic XR

193
Q

Most important factor increasing risk of postop infxn after pelvic ring fx?

A

1: BMI***

Others: Morel-Lavallee, ass’d acetabular fx fixation***, GU or abdominal trauma, increased blood transfusion, increased OR time

***Pelvic embolization NOT increased risk

194
Q

Advantage of supraacetabular pins vs iliac crest pins?

A

They do not interfere or contaminate future approaches to pelvics or acetabulum involving the LATERAL window

Obturator outlet view, find tear drop of bone, place pin 2 cm pros to hip joint to avoid hip capsule. Blunt dissection and guide sleeve to prevent LFCN injury. Iliac oblique when partially inserted to make sure passing superior to superior gluteal notch. Obturator inlet after placement to confirm in bone throughout length

195
Q

How to perform pelvic packing?

A

Place pelvic ex-fix followed by packing pelvis with lap pads via sub umbilical incision

196
Q

Most common ass’d acetabular fx?

A

Transverse + posterior wall

197
Q

Obturator oblique view shows?

A

Anterior column + posterior wall

198
Q

Iliac oblique view shows?

A

Posterior column + anterior wall

199
Q

How to perform EUA for posterior wall fx?

A

Hip flexed, abducted, axial load

Use obturator oblique view (posterior wall)

Opening of medial clear space*** = instability

200
Q

Timing of acetabular fx…when do ass’d hip dislocations do worse (timing-wise)?

Earlier OR for acetabular fx ass’d with?

A

Ass’d hip dislocations should be reduced w/in 12 hrs for better outcomes

Worse outcomes with fx fixation >3 weeks after injury

Earlier OR ass’d w/ increased chance of ANATOMIC REDUCTION***

201
Q

What radiographic view shows:

1- joint penetration of anterior column screw?

2-Anteroposterior position of screw thru pubic ramus?

3-Supraacetabular pin within tables of ilium

A

1: joint penetration: obturator outlet/shows cranial/caudal of screw going thru ramus
2: AP in pubic ramus: Iliac inlet
3: w/in tables of ilium: Obturator inlet

202
Q

Anterior approach to acetabular fx

Windows? Access of each?

Indications?

Risks?

A

Anterior approach/ilioinguinal

Medial window: medial to external iliac vessels
-Access to pubic rami, indirect access to internal iliac fossa and anterior SI joint

Middle window: between iliac vessels and iliopsoas
-Access to pelvic brim, quadrilateral plate

Lateral window: Lateral to iliopsoas (iliopectineal fascia)
-Access to quadrilateral plate, SI joint, iliac wing

Indications: anterior wall and column***
Both column
Posterior hemitransverse

Risk: Femoral nerve injury
LFCN
Thrombosis of vessels
Laceration of corona mortis in 10-15% ***

203
Q

Posterior approach to acetabular fx

Indications

Risks?

A

Posterior/Kocher-Langenbach

Indications: Posterior wall and posterior column**
Most transverse and T type

Risks: Increased risk of HO vs anterior approach
Sciatic nerve (2-10%)***
Damage to medial fem circumflex artery/blood supply to head

204
Q

Extensile approach to acetabular fx

Indications?

Risks?

A

Extensile/extended iliofemoral

IndicationsOnly approach that allows direct visualization of both columns*
Ass’d fx patter >3 wks out
Some transverse and T-type
Some both column (if posterior comminution present)*

-Risks: Massive HO***
Posterior gluteal muscle necrosis

205
Q

Modified Stoppa approach for acetabular fx

Indications?

Risks?

A

Indications: access to quadrilateral plate to buttress comminuted medial wall fx (Both column)

Risk: Corona mortis (must be exposed and ligated)

206
Q

Long term (20 year) survival for patients s/p ORIF for acetabular fx?

Most common complication? Risk factors?

A

80%

Most common complication: DJD
Risk factors:
Age >40***
Ass'd pattern
Concomitant femoral head injury***

Other complications: HO, osteonecrosis, DVT/PE

207
Q

Factors ass’d w/ fetal M&M with acetabular fx?

A

Injury severity
Mechanism of injury***
Maternal hemorrhage

208
Q

Bado classification for Monteggia fx

A

Type I: anterior dislocation of radial head (most common) ***

Type II: Posterior dislocation of radial head
HIGHEST complications and WORST prognosis **

Type III: Fx of ulnar metaphysic (distal to coronoid) with lateral dislocation of radial head

Type IV: Fx of both radius/ulna and dislocation of radial head in any direction

209
Q

Most common impediment to radiocapitellar reduction after anatomic reduction of ulna in Monteggia fx?

A

Annular ligament interposition in RC joint

210
Q

What direction does radial head usually go with Monteggia fx?

A

Follows apex of ulna***

Apex anterior ulna = most commonly dislocated anteriorly (Bado I, also most common)

211
Q

Galeazzi fx definition?

Incidence of DRUJ instability related to length from articular surface?

A

Def: distal 1/3 radial shaft fx + DRUJ injury

Incidence of DRUJ instability:
-If radial fx <7.5 cm from articular surface, DRUJ instability 55%

-If radial fx >7.5 cm from articular surface, DRUJ instability 6%

212
Q

Primary stabilizers to DRUJ (Galeazzi fx)?

What position most stable in?

A

Volar and dorsal radioulnar ligaments***

Most stable in supination

213
Q

What can cause reduction block of DRUJ in Galeazzi fx?

A

interposition of ECU tendon***

214
Q

Starting point for tibial nail?

Deformity if started to lateral? Too medial?

Where to place blocking screws for prox 1/3 tibia fx?

A

Starting point: Medial portion of lateral tibial spine

Too lateral: creates varus (so ok to start slightly more lateral in prox 1/3 tibia fx to decrease valgus deformity)

Too medial: creates valgus deformity

Blocking screws
Coronal blocking: place posteriorly in prox fragment to prevent procurvatum

Sagittal blocking: place lateral in proximal frag to prevent valgus

215
Q

What deformity does supra patellar nailing help prevent?

A

Helps prevent apex anterior/procurvatum

216
Q

Risk of LISS plate for tibia fx?

A

Superficial peroneal nerve (approx 5 mm from hole 13)

217
Q

Which BMP to use with open tibial shaft fx?

Which BMP for nonunion tibia fx?

A

rhBMP-2

Accelerate early fx healing
Decrease rate of hardware failure and subsequent bone grafting required
Less secondary invasive procedures
Decreased infxn rate
Not fully supported in newer studies...

Nonunion: BMP-7 (OP-1)

218
Q

Reamed vs undreamed tibial nails

A

CLOSED injuries
lower rate of primary events (need for bone grafting, implant exchange or dynamization) -mostly due to less dynamization needed

OPEN injuries
NO differences between reamed and undreamed ***

219
Q

How close to knee joint can tibial pin be for ex fix?

A

14 mm or further, knee capsule inserts 14 mm below articular surface

220
Q

How long to observe a tibia fx before secondary intervention for nonunion?

A

6 months

221
Q

When to not use a tourniquet for tibia fx?

A

Polytrauma with femur fx where femur is nailed

Surgical tx of tibia or ankle with tourniquet increases pulmonary complications

222
Q

What nerve can be affected by closed nailing of tibia fx?

A

Deep peroneal nerve, approx 5%, decreased EHL, transient

223
Q

Most common malalignment when nailing distal 1/3 tibia fx vs plating?

A

Valgus

IMN malalignment 23% vs plating 8%
70% valgus

224
Q

4 fragments with pilon fx?

A

1: medial malleolar - deltoid ligament
2: Posterior malleolus/Volkmann fragment (PITFL)
3: Anterolateral/Chaput (AITFL)
4: lateral malleolus = wagstaffe

225
Q

Factors that correlate with poor clinical outcome and inability to return to work after pilon fx?

A 
Lower level of education***
Male
Pre-existing medical condition
Work related injury
Lower income level
226
Q

Anterior tib artery
Which branch of popliteal artery?
Where does it run?
What artery does it terminate as?

Which nerve does it run with?

A

1st branch of popliteal artery

Passews between 2 heads of posterior tib and IOM
Lies anterior to IOM between tib ant and EHL

Terminates as dorsalis pedis

Runs with deep peroneal nerve

227
Q

Posterior tib artery
Where does it run?
What artery does it terminate as?

A

Continues in deep posterior compartment of leg
Goes behind medial malleolus

Terminates by dividing Ito medial and lateral plantar nerves

Runs with tibial nerve

228
Q

Peroneal artery
Where does take off from popliteal artery?
Where does it run?
What artery does it terminate as?

A

Main branch takes off 2.5 cm distal to popliteal fossa

Continues in deep compartment, between tib posterior and FHL

Terminates as calcanea branches

229
Q

Fixation of fibula during pilon fx - helpful?

A

Fixation of fibula in pilon fx shown to have higher overall complication rates***

230
Q

What type of cell death in pilon fx leads to post traumatic arthritis?

A

Initial superficial zone cartilage cell death via necrosis at fracture margins

231
Q

Articulations of talus

A

1: inferior surface articulates with posterior facet of calc***
2: Talar head articulates with navicular and sustenaculum tali
3: Lateral process articulates with posterior facet of calc and lateral malleolus
4: Posterior process consists of medial and lateral tubercles separated by groove for FHL

232
Q

Blood supply to talar neck

A

1: Posterior tibial artery
Via artery of tarsal canal (dominant supply)*
Supplies majority of talar body
Deltoid branch of posterior tib artery: supplies medial portion of talar body - may only blood supply remaining in displaced fx*

Anterior tib artery
Supplies head and neck

Perforating perineal artery via artery of tarsal sinus***
Supplies head and neck

233
Q

Hawkins classification of talus fx

A

Hawkins I: non displaced, low chance of AVN

Hawkins II: subtalar dislocation, 20-50% AVN

Hawkins III: Subtalar and tibiotalar dislocation, 20-100% AVN

Hawkins IV: Subtalar, tibiotalar, talonavicular dislocation, 70-100% AVN

234
Q

Most common complication in talus fx?

Other complications

A

Most common: post-traumatic arthritis*
Subtalar arthritis is MOST COMMON* (50%)

Others
Osteonecrosis, 30%
Hawkins sign, subchondral lucency seen on mortise at 6-8 weeks, intact vascularity w/ resorption of subchondral bone

Varus malunion 25-30%
Causes decreased subtler eversion*
Weight bearing on lateral side of foot
Tx with medial opening wedge of talar neck*

235
Q

What type of subtalar dislocation is more likely to be open?

Which dislocations do worse?

A

Lateral dislocation (though less common than medial dislocation 65-80%)***

Lateral more likely to have concomitant fx***

Factors ass’d with poor outcome:
High E mech*
Lateral dislocation* (more high E mech)
Open dislocations*
Concomitant fx involving subtalar joint*

236
Q

Position of foot for medial subtalar dislocation?

What blocks medial subtalar dislocation?

A

Foot locked in supination***

Blocked by:
Peroneal tendons
EDB*** (most common)
Talonavicular joint capsule

237
Q

Position of foot for lateral subtalar dislocation?

What blocks lateral subtalar dislocation?

A

Foot locked in pronation***

Blocked by:
PT tendon*** (most common)
FHL
FDL

238
Q

Complications after subtalar dislocation?

A

Most common: Stiffness***

Post-traumatic arthritis
Subtalar joint most commonly affected, 2/3 symptomatic

239
Q

Open calc fx: increased infxn rate? increased wound complications?

A

Open fx: NO increased infxn rate***

INCREASED wound complications***

240
Q

Anterior process of calc fx: what ligament is disrupted?

A

Bifurcate ligament***

Runs from anterior calc process to both cuboid and lateral aspect of navicular (Y-ligament)

241
Q

Fragments of intra-articular fx of calc

A

Superomedial fragment*
constant fragment*
Includes sustentaculum tali, stabilized by strong ligamentous and capsular attachments

Superolateral fragment***
Includes and intra-articular aspect through the posterior facet

Secondary fx lines
dictate whether there is joint depression or tongue-type fx

242
Q

Factors ass’d with complications with calc fx?

A

40% complication rate***

Increased due to mechanism (fall from height), smoking, early surgery
lateral soft tissue trauma increases risk of complication

243
Q

Why is superomedial/anteromedial fragment constant in calc fx?

A

Medial talocalc and interosseous ligaments ***

244
Q

Rads findings for calcaneus fx

Double density sign?

Varus or valgus deformity?

Bohler angle?

Angle of Gissane?

A

Dbl density: lateral view shows partial separation from sustentaculum –> lateral portion of posterior facet* (medial portion of posterior facet in “constant fragment)*

Varus tuberosity deformity

Bohler angle: line from heist point of anterior process to highest point of posterior facet then line from top of posterior facet to superior edge of tuberosity on lateral
Normal 20-40 deg ***
Represents collapse of posterior facet

Angle of Gissane
Angle between line along lateral margin of posterior facet and line anterior to beak of calc on lateral view
Normal 120-145***
Represents collapse of posterior facet

245
Q

Surgical outcome of calc fx ass’d with?

Factors ass’d with poor outcome?

A

Surg outcome correlates with number of intra-articular fragments*** and quality of reduction

Surg tx decreases risk of post traumatic arthritis ***

Factors ass'd w/ worse outcome:
Age >50 (similar outcome w/ and w/o surg)
Obesity
Men do worse than women***
Smokers***
Bohler angle <0 ***
Manual laborer***
Worker's comp***
246
Q

Typical patient who will need secondary subtalar fusion after calc fx?

A

Male worker’s comp who participates in heavy labor with initial Bohler angle <0 deg

247
Q

What artery supplies lateral skin for extensile L shaped incision for calc fx?

A

Lateral calcanea branch of peroneal artery***

248
Q

Malunion of calc

PE?

Tx?

goals of tx?

A

PE: limited dorsiflexion, due to dorsiflexed talus with talar declination angle of <20 deg***

Tx: Distraction bone block subtalar arthrodesis***
Chronic pain from subtalar joint
Loss calc height
incongruous subtalar joint/post traumatic DJD
Mechanical block to ankle dorsiflexion (from posterior talar collapse into posterior calc)

Goal to correct the following:***
Hindfoot heigh
Ankle impingement
subfibular impingement
subtalar arthritis
249
Q

Benefit of Surgery vs non surgical for displaced intra-articular calc fx?

A

Ass’d with approx 6 fold decrease in risk of post traumatic subtalar arthritis (necessitating subtalar arthrodesis) vs nonsurg***

250
Q

Most common complication with surgical tx of calc fx?

A

Wound dehiscence or wound healing issues

251
Q

What patients do better with surgery vs non surgical for calc fx?

A

Women*
<29 y/o*
Bohler 0-14 dg*
Sedentary job*

252
Q

After traumatic intra-articular injury, what molecular change causes post traumatic arthritis?

A

Intitial SUPERFICIAL ZONE cartilage cell death via NECROSIS at the FRACTURE MARGINS***

Delayed superficial zone cartilage cell death occurs via apoptosis at the fracture margins

253
Q

Effect of bisphosphonates on fx healing (intertroch) within 3 months of surgical intervention?

A

No effect***

254
Q

How long to wait for 2nd stage for Masquelet technique?

when do BMPs peak and how long present after Masquelet?

A

4-6 weeks***

BMP peaks at 4 weeks and is elevated until 6 months***

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