MSK Flashcards
avulsion fx –> iliac crest –> what muscle?
transversalis, internal & external obliques
avulsion fx –> ASIS –> what muscle?
sartorius
avulsion fx –> AIIS –> what muscle?
rectus femoris
avulsion fx –> iliac tuberosity –> what muscle?
hamstrings:
- biceps femoris
- gracilis
- semimembranosus
- semitendinosus
avulsion fx –> lesser trochanter –> what muscle?
iliopsoas
osteoid osteoma –> involves what type of bone? which part of the bone?
lower ext –> long bone –> metaphysis or diaphysis –> intracortical
osteoid osteoma –> MC age range
teens
osteoid osteoma –> radiographic finding
cortex –> lucent nidus -> surrounding sclerosis
osteoid osteoma –> clinical presentation
pain worse at night –> relieved w aspirin
osteoid osteoma –> tx?
- surgical excision
- CT-guided percutaneous ablation
what is osteochondroma?
osteocartilaginous exostosis (cartilage-capped bony projection)
osteochondroma –> what part of bone?
metaphysis –> cortex
osteochondroma –> MC bones? (3)
- tibia
- femur
- humerus
osteochondroma –> complication (3)
- growth abnormality –> ie bowing, limb shortening
- compression of adjacent vessels/nerves
- malig transformation to chondrosarcoma
bony lesion: types of matrix? (4)
- no matrix
- chondroid (arcs of bony rim)
- fibrous (groundglass)
- osseous
Romanus lesion & shiny corner –> dx?
inflammatory spondyloarthropathy:
- ankylosing spondylitis
- enteropathic arthritis
Romanus lesion –> what does it look like?
irregularity & erosion of ant/post vertebral endplates
shiny corner –> what does it look like?
T2 hyperintense corner of vertebral body (reactive sclerosis)
band acro-osteolysis –> ddx? (2)
- polyvinyl chloride exposure
- Hajdu-Cheney synd
terminal acro-osteolysis –> ddx? (4)
- psoriatic arthritis
- hyperPTH
- thermal injury
- scleroderma
amyloid arthropathy –> assoc with what other condition?
chronic renal failure on longterm dialysis
amyloid arthropathy –> imaging features (2)
- chronic erosions
- preserved jt space
dermatomyositis –> increased risk for what condition?
malignancy
Pagets disease –> complication –> malignant transformation –> what malignancy?
osteosarcoma
spondylitis –> etiology? (4)
- ankylosing spondylitis
- juvenile RA
- psoriatic arthritis
- septic arthritis
lateral subtrochanteric cortex –> focal new bone formation –> internal linear lucency –> dx?
bisphosphonate-related proximal femoral fx
Looser zones –> aka? (3)
- cortical infraction
- Milkman lines
- pseudofracture
Looser zones –> what is? what does it look like?
insufficiency fx –> transverse lucency –> partway thru bone –> perpendicular to cortex –> sclerotic borders
Looser zones –> assoc with what condition?
osteomalacia/rickets
Looser zones –> common locations? (5)
- pubic rami
- medial femoral neck/shaft
- lateral scapula
- posterior proximal ulna
- ribs
Segond fx –> location?
proximal tibia –> lat
differentiate: perilunate vs lunate dislocation
perilunate:
- normal radiolunate jt
- carpal bones dislocated relative to lunate
lunate:
- lunate completely dislocated volarly
- other carpal bones normal position
perilunate vs lunate dislocation –> which is more severe?
lunate
primary vs secondary osteosarcoma –> which has worse prognosis?
secondary
least common type of shoulder dislocation?
inferior
inf shoulder dislocation –> MC assoc complication?
brachial plexus neurovascular injury
gullwing appearance –> classically seen in what arthropathy?
erosive osteoarthritis
Morton neuroma –> pathophys?
foot –> intermetatarsal ligament –> chronic entrapment of plantar nerve –> perineural fibrosis
osteosarcoma –> which type has best prognosis?
parosteal
achilles tendon –> tendinosis –> MRI findings? (2)
- tendon thickening –> fusiform shape
- T1 diffuse low signal
aneurysmal bone cyst –> primary & secondary causes
- primary: prior trauma
- secondary: pre-existing condition (fibrous dysplasia, giant cell tumor, chondroblastoma, …)
Which structures constitute the pes anserinus
Sartorius, semitendinosus, gracilis tendons
“double PCL” sign indicates?
Bucket-handle tear of the medial meniscus
what tendon is the primary support of the midfoot arch.
Posterior tibial tendon
malig tumor characterized by a subarticular location
chondrosarcoma
osteosarcoma –> which type has the worst prognosis
2ary
red marrow to fatty marrow –> order of conversion?
The epiphyses convert to fatty marrow soon after they ossify. Diaphysis precedes metaphysis and distal precedes proximal
pes anserinus –> insert?
anteromed tibia
