MSK Flashcards
causes of distal clavicular osteolysis
Hyperparathyroidism, Cleidocranial dysostosis, Pyknodysostosis, Rheumatoid Arthritis, Trauma, Scleroderma
lucent lesions that cause adjacent sclerosis (“bone irritating lesions”)
osteoid osteoma, chondroblastoma, eosinophilic granuloma, infection
causes of avascular necrosis
alcoholism, steroids/SLE/sickle cell, Gaucher’s, pancreatitis, trauma, infection/idiopathic, caisson disease
Bohler angle less than what indicates calcaneal fx?
20 degrees
patellar tendon-lateral femoral condyle friction syndrome is associated with?
- patella alta - lateral patellar subluxation
patellar tendon-lateral femoral condyle friction syndrome is also called
Hoffa fat pad impingement syndrome
normal Insall-Salvati ratio
< 1.2
what attaches as conjoined tendon on fibula?
biceps femoris AND lateral collateral ligament
what attaches with the posterior fibers of the IT band on the lateral proximal tibia?
anterior oblique band of LCL
sign?
dx?
- yo-yo on a string
- Stener lesion
MC type of acetabular fx
posterior wall
what kind of shoulder dislocation is MC?
anterior inferior (subcoracoid)
Hill-Sachs is best seen on which view?
internal rotation
Bankart is on which part of glenoid/labrum?
anterior inferior
proximal tear of ulnar collateral ligament (UCL)
which is most important band of UCL?
anterior
when does UCL get torn?
valgus stress (pitchers)
what is it and MC Location
- bipartite patella
- superolateral
rupture of which tendon can lead to flatfoot?
tibialis posterior
soft tissue mass in foot
synovial sarcoma
age for synovial sarcoma
20-40 yo
x-18 translocation
synovial sarcoma
Baker’s cysts are located where
between medial head of gastroc and semimembranosus
synovial sarcoma signs
- triple sign
- bowl of grapes
synovial sarcoma
“bowl of grapes” and “triple sign” (H, I, L meaning areas of high, intermediate, and low intensity)
in Stener lesion, what is superficial to what?
UCL is superficial to adductor pollicis aponeurosis
pull of what ligament causes triquetral avulsion?
radiocarpal ligament
liposarcoma variant in patient < 20 yo and MR imaging characteristics
- myxoid liposarcoma
- T1 dark, T2 bright
clubfoot
- elevated plantar arch
- hindfoot varus
- medial deviation and inversion of forefoot
which angle is decreased in hindfoot varus ?
talocalcaneal angle
rocker bottom foot
- hindfoot valgus
- vertical talus
rocker bottom foot association
myelomeningocele
signs of talocalcaneal coalition
- continuous C
- talar beak
talocalcaneal (subtalar) coalition involves which facet?
middle facet
anteater sign is what?
seen in which coalition?
- elongated anterior process of calcaneus
- calcaneonavicular
what causes continuos C sign?
absent middle facet of subtalar joint
SLAP
MC peds elbow fractures
supracondylar > lateral condyle > medial epicondyle
little league elbow
medial epicondyle avulsion
conjoint tendon at fibular head formed by what?
biceps femoris + LCL
parameniscal cysts seen on which side?
lateral meniscus
discoid meniscus side
lateral meniscus
medial meniscus is thicker on which side?
posterior
tennis elbow
lateral epidondylitis
MC structure to be injured in lateral epicondylitis
common extensor tendon (MC muscle - extensor carpi radialis brevis)
rotator interval
what insert on Gerdy’s tubercle
- IT band
- tibialis anterior
Gerdy’s tubercle
lateral condyle of proximal tibia
where are 1st manifestations of AS?
SI joints
SIJ erosions of AS favor which side?
iliac
DDx of calcaneal erosions
reactive arthritis, RA
Felty syndrome
- RA
- splenomegaly
- neutropenia
accessory navicular can cause chronic tearing of which tendon
tibialis posterior tendon
which synovial spaces normally communicate?
pisiform recess and radiocarpal joint
finding and association
Freiberg infraction
high-heeled shoes
ALPSA
anterior labral periosteal sleeve avulsion
GLAD
glenolarbral articular disruption
MC location of subchondral insufficiency fx in knee
medial femoral condyle
T-score in osteoporosis
< -2.5
T-score in osteopenia
-1.0 to -2.5
factors predisposing to patellar instability
- patella alta
- trochlear dysplasia
- lateralization of tibial tuberostity
ALPSA
pivot shift reciprocal contusions
posterior lateral tibial plateau + anterior lateral femoral condyle
what structure?
what attaches here?
AIIS
rectus femoris
grade 2 AC separation
AC interval > 6 mm, CC interval normal
grade 3 AC separation
disruption of AC + CC AND superior dislocation of clavicle
grade 4 AC separation
posterior displacement of clavicle
intraosseous lipoma
rocker bottom
clubfoot
posterior ankle impingement
os trigonum syndrome
MC soft tissue tumors of hand
- ganglion cyst
- GCT of tendon sheath (PVNS)
MR signal characteristics of GCT of tendon sheath
T1 dark, T2 dark
location of sublabral recess
follows contour of what?
12 o’clock
glenoid
Bankart is where on glenoid?
anterior inferior
