MSK

Question 1

avulsion fx –> iliac crest –> what muscle?

Answer 1

transversalis, internal & external obliques

Question 2

avulsion fx –> ASIS –> what muscle?

Answer 2

sartorius

Question 3

avulsion fx –> AIIS –> what muscle?

Answer 3

rectus femoris

Question 4

avulsion fx –> iliac tuberosity –> what muscle?

Answer 4

hamstrings:
- biceps femoris
- gracilis
- semimembranosus
- semitendinosus

Question 5

avulsion fx –> lesser trochanter –> what muscle?

Answer 5

iliopsoas

Question 6

osteoid osteoma –> involves what type of bone? which part of the bone?

Answer 6

lower ext –> long bone –> metaphysis or diaphysis –> intracortical

Question 7

osteoid osteoma –> MC age range

Answer 7

teens

Question 8

osteoid osteoma –> radiographic finding

Answer 8

cortex –> lucent nidus -> surrounding sclerosis

Question 9

osteoid osteoma –> clinical presentation

Answer 9

pain worse at night –> relieved w aspirin

Question 10

osteoid osteoma –> tx?

Answer 10

• surgical excision

- CT-guided percutaneous ablation

Question 11

what is osteochondroma?

Answer 11

osteocartilaginous exostosis (cartilage-capped bony projection)

Question 12

osteochondroma –> what part of bone?

Answer 12

metaphysis –> cortex

Question 13

osteochondroma –> MC bones? (3)

Answer 13

• tibia
• femur
• humerus

Question 14

osteochondroma –> complication (3)

Answer 14

• growth abnormality –> ie bowing, limb shortening
• compression of adjacent vessels/nerves
• malig transformation to chondrosarcoma

Question 15

bony lesion: types of matrix? (4)

Answer 15

• no matrix
• chondroid (arcs of bony rim)
• fibrous (groundglass)
• osseous

Question 16

Romanus lesion & shiny corner –> dx?

Answer 16

inflammatory spondyloarthropathy:

• ankylosing spondylitis
• enteropathic arthritis

Question 17

Romanus lesion –> what does it look like?

Answer 17

irregularity & erosion of ant/post vertebral endplates

Question 18

shiny corner –> what does it look like?

Answer 18

T2 hyperintense corner of vertebral body (reactive sclerosis)

Question 19

band acro-osteolysis –> ddx? (2)

Answer 19

• polyvinyl chloride exposure

- Hajdu-Cheney synd

Question 20

terminal acro-osteolysis –> ddx? (4)

Answer 20

• psoriatic arthritis
• hyperPTH
• thermal injury
• scleroderma

Question 21

amyloid arthropathy –> assoc with what other condition?

Answer 21

chronic renal failure on longterm dialysis

Question 22

amyloid arthropathy –> imaging features (2)

Answer 22

• chronic erosions

- preserved jt space

Question 23

dermatomyositis –> increased risk for what condition?

Answer 23

malignancy

Question 24

Pagets disease –> complication –> malignant transformation –> what malignancy?

Answer 24

osteosarcoma

Question 25

spondylitis --> etiology? (4)

Answer 25

- ankylosing spondylitis - juvenile RA - psoriatic arthritis - septic arthritis

Question 26

lateral subtrochanteric cortex --> focal new bone formation --> internal linear lucency --> dx?

Answer 26

bisphosphonate-related proximal femoral fx

Question 27

Looser zones --> aka? (3)

Answer 27

- cortical infraction - Milkman lines - pseudofracture

Question 28

Looser zones --> what is? what does it look like?

Answer 28

insufficiency fx --> transverse lucency --> partway thru bone --> perpendicular to cortex --> sclerotic borders

Question 29

Looser zones --> assoc with what condition?

Answer 29

osteomalacia/rickets

Question 30

Looser zones --> common locations? (5)

Answer 30

- pubic rami - medial femoral neck/shaft - lateral scapula - posterior proximal ulna - ribs

Question 31

Segond fx --> location?

Answer 31

proximal tibia --> lat

Question 32

differentiate: perilunate vs lunate dislocation

Answer 32

perilunate: - normal radiolunate jt - carpal bones dislocated relative to lunate lunate: - lunate completely dislocated volarly - other carpal bones normal position

Question 33

perilunate vs lunate dislocation --> which is more severe?

Answer 33

lunate

Question 34

primary vs secondary osteosarcoma --> which has worse prognosis?

Answer 34

secondary

Question 35

least common type of shoulder dislocation?

Answer 35

inferior

Question 36

inf shoulder dislocation --> MC assoc complication?

Answer 36

brachial plexus neurovascular injury

Question 37

gullwing appearance --> classically seen in what arthropathy?

Answer 37

erosive osteoarthritis

Question 38

Morton neuroma --> pathophys?

Answer 38

foot --> intermetatarsal ligament --> chronic entrapment of plantar nerve --> perineural fibrosis

Question 39

osteosarcoma --> which type has best prognosis?

Answer 39

parosteal

Question 40

achilles tendon --> tendinosis --> MRI findings? (2)

Answer 40

- tendon thickening --> fusiform shape | - T1 diffuse low signal

Question 41

aneurysmal bone cyst --> primary & secondary causes

Answer 41

- primary: prior trauma | - secondary: pre-existing condition (fibrous dysplasia, giant cell tumor, chondroblastoma, ...)

Question 42

Which structures constitute the pes anserinus

Answer 42

Sartorius, semitendinosus, gracilis tendons

Question 43

“double PCL” sign indicates?

Answer 43

Bucket-handle tear of the medial meniscus

Question 44

what tendon is the primary support of the midfoot arch.

Answer 44

Posterior tibial tendon

Question 45

malig tumor characterized by a subarticular location

Answer 45

chondrosarcoma

Question 46

osteosarcoma --> which type has the worst prognosis

Answer 46

2ary

Question 47

red marrow to fatty marrow --> order of conversion?

Answer 47

The epiphyses convert to fatty marrow soon after they ossify. Diaphysis precedes metaphysis and distal precedes proximal

Question 48

pes anserinus --> insert?

Answer 48

anteromed tibia