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Rad video > MSK > Flashcards

MSK Flashcards

1
Q

Crescent sign

A

Osteonecrosis

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2
Q

FICAT staging of AVN

A

I - normal XR, abnormal line of demarcation on MRI
II - trabecular changes, patchy sclerosis and lucency
III - segmental flattening
IV - secondary OA

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3
Q

SLAP lesion

Dx criteria

A

labral tear
superior labrum anterior - posterior to biceps anchor

High SI perpendicular to biceps tendon ( normal sublabral sulcus is parallel to biceps anchor)

Linear high signal which extends posterior to labrum.

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4
Q

ABCDES approach to joints

A 
Alignment
Bone density
Cartilage/joint space
Distribution
Erosion
Soft tissues
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5
Q

Psoriatic arthritis

RF

A 
Pencil in cup / IP jt erosions (fuzzy)
Periostitis/new bone form
Distal predominance
Telescoping
Ivory phalanx
Soft tissue swelling- sausage digit
Sacroiliitis/ankylosis
Asymmetrical paravertebral ossification, bulky, non marginal
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6
Q

Arthritis with preserved joint space 3

A

Synovial osteochondromatosis
PVNS
TB - Phemisters triad

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7
Q

Phemister triad in TB joint involvement

A

PEriarticular osteopenia
Marginal erosions
Gradual narrowing of jt space

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8
Q

Ossification of the PLL

A 
Idiopathic
Men
C -S
Myolpathy
DISH
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9
Q

DISH

A

flowing ossification > 4 levels
normal disc height
SI joints normal
….Extensive osteophytosis without disc narrowing or sclerosis

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10
Q

Pagets disease
3 Phases
Buzzwords
Complications

A

Lytic - flame/lytic with non sclerotic/ blade of grass

Mixed - trabecular coarsening, osseous expansion, cortical thickening

Sclerotic - ivory vert.

Picture frame
Oste. circumscripta
Cotton wool skull

Complications:
Bowing
Fractures
Neurologic compromise
Sarcomatous transformation
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11
Q

SLE arthritis
RF
6

A 
non sp ST swelling
Non erosive
Reducible subluxation (3-8%) - ulnar dev
Calcification
Osteoporosis
Acrosclerosis/osteolysis
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12
Q

Arthritis with normal joint space

A

Gout
PVNS
Primary synovial osteochondromatosis
SLE

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13
Q

Arthritis with uniform jt space narrowing

A

Inflammatory

Infection

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14
Q

Arthritis with non uniform narrowing

A

OA
Neuropathic
CPPD

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15
Q

SLAC Wrist

A 
Scapholunate advanced collapse
Widening of scapholunate articulation ( Terry Thomas)
Capitate migration down
SL tears
Common with CPPD, RA, drilling
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16
Q

Lytic lesions in posterior elements of spine

GO APE

A 
GCT
OSteoblastoma
ABC
Plasmacytoma
EG
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17
Q

Radiographic changes of acute pyogenic osteomyelitis

Acute
7-10d
2-4w
6-8w

A

Acute (24-48hrs) : ST swelling, loss of fat plane

7-10 days : intramedullary destruction

2-4 weeks : cortical destruction, endosteal scalloping, periosteal reaction

6-8 weeks : sequestrum, involucrum (reactive new bone beneath elevated periosteum)

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18
Q

Sclerosing osteomyelitis

A

Osteomyelitis of Garre
Subacute form
Extensive diaphyseal sclerotic lesions

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19
Q

Septic arthritis
MRI findings
6

A 
Joint effusion
Soft tissue oedema
Synovial CE
Uniform jt space narrowing
Erosions
Bone marrow oedema
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20
Q

Sickle cell osteomyelitis

A

Salmonella, staph
Diaphyseal
Frequent in areas of infarction

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21
Q

Syphilis

Wimberger’s sign

A

Symmetric lytic lesions medial metaphyses of proximal tibia

Periostitis

Saber shin deformity ( anterior bowing)

Gummas ( sterile bone abscesses; mixed skull lesions)

22
Q

Rubella

XR findings

A

Medial metaphyseal beaking
Irregular metaphyses with celery stalking
DDx : toxo,CMV

23
Q

Hypoparathyroidism

RF

A

OSteosclerosis

Soft tissue Ca : subcut, BG

24
Q

Hypothyroidism

RF

A

Delayed skeletal maturation
Wormian bones
Epiphyseal dysgenesis : stippled, coned, fragmented

25
Q

RF thyroid acropachy

usually post Rx

A

fluffy symm periostitis

Soft tissue swelling

26
Q

Scurvy signs

A

Wimbergers ring at epiphyses

White line of Frankel of metaphysis

Metaphyseal corner # or spur ( Pelkens spur)

27
Q

Arthropathy affecting hands/wrists
DISTAL
3

A

Psoriasis
Reiters
OA

28
Q

Arthropathy affecting hands/wrists
Proximal
2

A

RA

CPPD

29
Q

Diseases that cause subchondral cysts GEODES

4

A

RA
DJD
CPPD
AVN

30
Q

Causes of high riding shoulder

3

A

CPPD
RA
Rotator cuff tear

31
Q

Asymmetric non marginal syndesmophytes

2

A

Psoriasis

Reiters

32
Q

Erosions with sclerotic margins

1

A

Gout

33
Q

Gout

A 
punched out Erosions
Mouse bite erosions
juxta articular
Sharply marginated
overhanging edge
Preserved joint space
Asymm polyart distri
normal mineralisation
ST masses
34
Q

Cause of pseudo charcot joint

1

A

CPPD

35
Q

Associations of CPPD

3

A

Primary HPT
Gout
Haemachromatosis

36
Q

Scleroderma/dermatomyo
RF
4

A

Soft tissue calcification
Soft tissue wasting
Osteoporosis
Acro osteolysis

37
Q

CPPD

RF

A

Chondrocalcinosis
Patellofemoral comp
Pseudogout arthropathy : medial jt sp narrowing, subchond sclerosis
, osteophyte formation.

38
Q

Haemachromatosis
RF
Assoc

A

Severe jt space narrowing mainly MCP
Sclerosis
minimal chondrocal
Assoc with CPPD 50%

39
Q

Charcot

6D

A 
Density ( sclero/paenia)
Destruction
Debris
Distension
Disorganisation
Dislocation
(heterotopic new bone)
40
Q

JIA

2

A

overgrowth epiphyses

Gracile diaphyses

41
Q

Apple core appearance of femoral neck

2

A

Synovial (osteo)chondromatosis

PVNS

42
Q

Friebergs infraction

A

AVN of second MT head
flattening, collapse, sclerosis
can also involve 3/4th MT heads
compensatory hypertrophy of cortex

43
Q

Keinbochs

A

lunatomalacia

AVN of lunate

44
Q

Kohlers

A

tarsonavicular AVN

45
Q

Haglunds Xd

A

retrocalcaneal bursitis
– > extensive erosive changes posterosup aspect of calcaneus
new bone,
soft tissue mass

46
Q

Ankylosing spondylitis
HIP/pelvis
5

A 
concentric jt space narrowing
articular erosions
fluffy enthesopathy
fused SIJ
protrusio acetabuli
47
Q

Haemachromatosis
Demo
RF

A 
30-50 yr, rare, delayed dx
Arthritis/joint pain presenting
Early OA without trauma : MCP, ankle, wrist
FHx positive
Do Serum Fe/transferin sat ratio >45%
48
Q

Milwaukee shoulder

A 
Older women
Huge effusion
Arthritis
Crystal ( HADD)
rotator cuff tear
49
Q

fluid vs synovitis

A

Anechoic fluid
compressible fluid
no hyperaemia fluid
Synovitis - non compressible, hyperaemia.

50
Q

Intra articular Gout USS
monosodium urate
neg birefringence

A 
joint effusion - tiny hyperechoic foci
cartilage icing - double contour sign ( cf CPPD 
 mid cartilage)
Synovitis
Erosions
51
Q

Tophi appearance
USS
MRI

A

USS: hyperechoic, heterogeneous with hypoecho rim,
wet clump of sugar
variable shadowing

MRI
T 1 low /iso
T2 hetero
CE hetero

Rad video (10 decks)

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