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Flashcards in MSK Deck (51)
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1

Crescent sign

Osteonecrosis

2

FICAT staging of AVN

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

3

SLAP lesion
Dx criteria

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.

4

ABCDES approach to joints

Alignment
Bone density
Cartilage/joint space
Distribution
Erosion
Soft tissues

5

Psoriatic arthritis
RF

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

6

Arthritis with preserved joint space 3

Synovial osteochondromatosis
PVNS
TB - Phemisters triad

7

Phemister triad in TB joint involvement

PEriarticular osteopenia
Marginal erosions
Gradual narrowing of jt space

8

Ossification of the PLL

Idiopathic
Men
C -S
Myolpathy
DISH

9

DISH

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

10

Pagets disease
3 Phases
Buzzwords
Complications

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

11

SLE arthritis
RF
6

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

12

Arthritis with normal joint space

Gout
PVNS
Primary synovial osteochondromatosis
SLE

13

Arthritis with uniform jt space narrowing

Inflammatory
Infection

14

Arthritis with non uniform narrowing

OA
Neuropathic
CPPD

15

SLAC Wrist

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

16

Lytic lesions in posterior elements of spine
GO APE

GCT
OSteoblastoma
ABC
Plasmacytoma
EG

17

Radiographic changes of acute pyogenic osteomyelitis

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

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)

18

Sclerosing osteomyelitis

Osteomyelitis of Garre
Subacute form
Extensive diaphyseal sclerotic lesions

19

Septic arthritis
MRI findings
6

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

20

Sickle cell osteomyelitis

Salmonella, staph
Diaphyseal
Frequent in areas of infarction

21

Syphilis
Wimberger's sign

Symmetric lytic lesions medial metaphyses of proximal tibia

Periostitis

Saber shin deformity ( anterior bowing)

Gummas ( sterile bone abscesses; mixed skull lesions)

22

Rubella
XR findings

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

23

Hypoparathyroidism
RF

OSteosclerosis
Soft tissue Ca : subcut, BG

24

Hypothyroidism
RF

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

25

RF thyroid acropachy
usually post Rx

fluffy symm periostitis
Soft tissue swelling

26

Scurvy signs

Wimbergers ring at epiphyses

White line of Frankel of metaphysis

Metaphyseal corner # or spur ( Pelkens spur)

27

Arthropathy affecting hands/wrists
DISTAL
3

Psoriasis
Reiters
OA

28

Arthropathy affecting hands/wrists
Proximal
2

RA
CPPD

29

Diseases that cause subchondral cysts GEODES
4

RA
DJD
CPPD
AVN

30

Causes of high riding shoulder
3

CPPD
RA
Rotator cuff tear