3: Introduction to LE Positioning - Smith

Question 1

portion closest to film cassette

Answer 1

view

Question 2

portion which the x-ray beam enters

Answer 2

projection

Question 3

anterior-posterior projection could also be called…

Answer 3

posterior-anterior view

Question 4

on a lateral view, the fibula sits ____ to tibia

Answer 4

posterior

Question 5

define sesamoids

Answer 5

bones within a tendon

sesamoid under the first metatarsal are constant

Question 6

talocalcaneal joint aka

Answer 6

subtalar

Question 7

talonavicular joint and calcaneocuboid joint aka

Answer 7

midtarsal or choparts joints

Question 8

joint b/w tarsal bones and five metatarsals

Answer 8

tarsometatarsal or lisfrancs joint

Question 9

structures demonstrated in AP projection

Answer 9

phalanges
sesamoids
metatarsals
tarsal bones

Question 10

central ray of AP image

Answer 10

angle 15* cephald

base of third metatarsal

Question 11

pt position AP projection

Answer 11

standing with foot on exposable side of film in angle and base of gait on orthoposer

Question 12

medial oblique view aka

Answer 12

lateral oblique projection

Question 13

structures demonstrated in MO

Answer 13

phalanges
metatarsals
tarsal bones
sesamoids

Question 14

central ray for MO

Answer 14

angle tube 45* aim at lateral cuneiform

Question 15

pt position MO and lateral oblique view and lateral projection

Answer 15

standing in angle and base of gait on Orthoposer

Question 16

structures demonstrated in lateral oblique view/ medial oblique projection

Answer 16

phalanges
metatarsals
tarsal bones
sesamoids

Question 17

central ray for lateral oblique view

Answer 17

angle tube 45* aim at medial cuneiform

Question 18

structures demonstrated in lateral projection of foot

Answer 18

first met
hallux
medial cuneiform
navicular 
talus 
calcaneus

Question 19

central ray lateral projection

Answer 19

90* or perpendicular to the lateral cuneiform

Question 20

structures demonstrated with raised lateral hallux

Answer 20

proximal and distal phalanges of the hallux

Question 21

central ray for raised lateral hallux

Answer 21

90* or perpendicular to center of hallux

Question 22

pt position raised lateral hallux

Answer 22

standing in angle and base of gait on orthoposer with foam under hallux to decrease overlap of other toes

Question 23

structures demonstrated with sesamoid or plantar axial

Answer 23

inferior aspect of the metatarsals and sesamoids

Question 24

central ray for sesamoid or plantar axial

Answer 24

90* or perpendicular to the film and aim at inferior heel

Question 25

pt position sesamoid or plantar axial

Answer 25

standing with foot on block or kneel on the tip toes

Question 26

structures demonstrated on calcaneal axial

Answer 26

subtalar or talocalcaneal joint and the calcaneus

Question 27

central ray for calcaneal axial

Answer 27

45* aimed at posterior subtalar or talocalcaneal joint

Question 28

pt position calcaneal axial

Answer 28

pt standing on the film in angle and base of gait

Question 29

structures demonstrated on AP of ankle

Answer 29

tibia
fibula
talus
ankle joint

Question 30

central ray AP of ankle

Answer 30

anterior ankle joint

Question 31

pt position AP of ankle

Answer 31

pt standing on orthoposer with back of leg against film

Question 32

structures demonstrated in ankle mortise

Answer 32

tibia
fibula
talus and ankle joint

Question 33

why use an ankle mortise?

Answer 33

decreases overlap b/w tibia and fibula

Question 34

central ray for ankle mortise

Answer 34

anterior ankle joint

Question 35

pt position ankle mortise

Answer 35

same as AP with foot rotated toward midline 15*

Question 36

structures demonstrated with lateral projection of ankle

Answer 36

tibia
fibula
talus
calcaneus
ankle joint

Question 37

central ray lateral projeciton of the ankle

Answer 37

90* or perpendicular to the film with ray entering lateral malleolus

Question 38

pt position lateral projection of akle

Answer 38

standing with medial malleolus against film

Question 39

ottawa rules =

Answer 39

ability to walk 4 steps
pain in posterior edge or tip of maleoli
pain at navicular or base of 5th met

designed to rule out unnecessary x-rays

if don’t have any of these, dont have fracture (98% sensitive)