Radiographic Anatomy Flashcards
What is the passive bone in the foot?
talus
(no tendinous structures attach to it) - so talus will move in relation to the calcaneus
On a lateral view, if the talus is not parallel to the weight-supporting plane, and in fact is dorsiflexed, what pathology/foot deformity does this indicate?
pronated type foot (flat foot)
On a lateral view, if the talus is not parallel to the weight-supporting plane, and in fact is plantarflexed, what pathology/foot deformity does this indicate?
high arch (cavus)
what is the medical term for a high arch foot?
cavus foot
what are teh features of a cavus foot?
- high arch
- increased calcaneal inclination angle (calcaneus is pointing up in a dorsiflex position)
- posterior break in the cyma line
- bullet hole sign
in which foot type do you see the bullet hole sign?
cavus foot
what are the features of a pronated foot type?
- decreased calcaneal inclination angle
- lowered arch
- anterior break in the cyma line
which joints does the cyma line represent?
talonavicular joint
calcaneocuboid joint
when seen on a lateral film, if there is a deformity in the cyma line, how should you describe it?
always in relation to the talonavicular joint (bc the calcaneocuboid joint is so stable that it doesn’t move)
in the cavus foot, what break is seen in the cyma line?
posterior break
in the pronated foot, what break is seen in the cyma line?
anterior break
what relationship in joints should the cyma line depict on a lateral film?
should form a smooth S
which view is more accurate for a cyma line- AP or lateral view?
lateral view is more accurate than AP view
what is the tarsometatarsal joint called?
Lis Franc’s joint
where does lis franc’s ligament run?
plantar ligament from the medial cuneiform to the base of the 2nd met
