11: Radiographic Anatomy - Bennett Flashcards
increased soft tissue attenuation and densities –>
swelling
breaks in teh cortex –>
fracture, bone infection
widening or decreasing of the joint space and alignment –>
infection
arthritis
the talus is a passive bone. what does that mean?
talus will move in relation to calcaneus
body of talus is normally parallel with weight of supporting plane
signs of a cavus foot
high arch
increased calcaneal inclination angle
posterior break in cyma line
bullet hole sign
signs of pronanted foot type
decreased angle of calcaneus
lowered arch
anterior break cyma line
calcaneal inclination angle and talar declination angle are _____ proportional
inversely
what joints are in the cyma line?
midtarsal articulations:
talonavicular jt
calcenocuboid jt
when discussing a cyma line deformity, it is always in relation to …
talonavicular jt
b/c the calcaneocuboid jt is so stable that it does not move
tarsometatarsal jt aka
lis franc’s jt
plantar ligament from the medial cuneiform to the 2nd met base
lis franc’s ligament
which bones don’t fuse until 25 years?
ilium
ischium
pubis
where is the secondary center of ossification in calcaneus?
poseterior epiphysis
shows up 6-8 yo
fuses 14-16 yo
time of appearance for primary ossification center
avg 3 yr
only primary centers of ossification; foot bones
cuboid
medial cuneiform
intermediate cuneiform
lateral cuneiform
which met has a secondary center of ossification at base?
first met
fuses 17-20 yo
2,3,4,5 met s all have head secondary centers of ossification
where are the phalangeal secondary centers of ossification?
base
small bones usually from a secondary ossification center that fail to unite with the remaining portion of the bone
accessory ossicles
may be confused w/ fx - check bilateral film; usually asymptomatic
accessory navicular
os tibiale externum
accessory cuboid
os peroneum
failed fusion of the posterior process of the talus
os trigonum
may be confused with shepherd fracture
often confused with a fracture of a sesamoid bone
bipartite sesamoid
where do you look radiologically for hallux abducto valgus deformity?
space b/w 1st and 2nd met
increased IM angle –> changes position of hallux to abducted and valgus frontal plane change
describe calcified vessel
tunica media
does not narrow the lumen
radiopaque
