lower extremity things to know

For ap axial toes what is the degree of the central ray

15 degrees posterior

ap/ap axial toe centering

3rd MTP

Collimation for ap/ap axial toes

1” sides and 1” prox to MTP

Degree of rotation for AP oblique toes

30-45 degrees medially

centering for lateral big toe

IP of the big toe

centering for the lateral toes

PIP

central ray degree for AP axial foot

10 degrees toward heel (cephalic)

centering for AP & AP oblique foot

base of the third metatarsal

AP & AP oblique foot collimation

1” on sides & 1” beyond calcaneous & distal toe

what should be overalpped in a AP/AP Axial foot

base of the 2,3,4 metatarsal bases

degree of rotation for AP oblique foot

30 degrees medial

what should be freed of SI on an AP oblique foot

3-5th metatarsal

what is the centering for a lateral foot

base of the 1st metatarsal

collimation for a lateral foot

1” on sides of shadow including medial malleolus

What is SI for a lateral foot

The plantar aspect of the metatarsal heads

what is perpendicular to the IR for a lateral foot

Patella

what should not touch IR for a lateral foot

heel

centering for an AP ankle

midway between the malleoli

collimation for all Ankle

1” on sides of shadow & 8’’ in length

where should toes be pointed for AP ankle

straight up

rotation for the Ankle Mortise view

15-20 degrees medially

rotation for AP oblique ankle w medial rotation

45 degrees medial

why would you perform an AP oblique ankle w LATERAL rotation

to view the superior aspect of the calcanenous

centering for A mediolateral ankle

medial malleolus

what is the indicator for under rotation for a lateral ankle

if the toes come up

what is the indicator for over rotation in a lateral ankle

if the heel comes up

what is the rotation of the central ray for plantodorsal calcaneus

40 degrees cephalic

for an angle of 15 degrees what do you do

divide the angle by 5 and subtract that by the SID for your new SID

centering for plantodorsal calcanenus

base of the third metatarsal

collimation for plantodorsal calcaneus

1” on all 3 sides of shadow of heel and keep base of 5th metatarsal in

what shows no rotation for plantodorsal calcenus

sustentaculum tali in profile on medial side

centering for a lateral calcaneus

1” inferior to medial malleolus

collimation for lateral calcaneus

1” beyond posteior & anterior heel shadow ( show medial mallelous and base of 1st and 5th metatarsal)

what is in profile for lateral calcaneus

tuberosity of the 5th metatarsal

centering for AP leg

center of leg

collimation for AP leg

1” beyond skin shadow & 1 ½ beyond ankle and knee

SID for AP leg

48”

what should be parallel with IR for AP leg

condyles

What should be perpendicular with IR for lateral leg

condyles

what illustrates a true lateral leg

distal fibula SI by posterior tibia & fibular head SI by tibia

What is the centering for an AP/ AP oblique/ AP weight-bearing knee

1/2” below the apex of the patella.

What is collimation for ap/ap oblique/lateral knee

8×10 LW

if the distance btw ASIS nd tabletop is <18 what is the degree

5 degrees caudad

if the distance btw ASIS and tabletop is 19-24 what is the degree

perpendicular

if the distance btw ASIS and tabletop is >25

5 degrees cephalic

centering for a lateral knee

1” distal to medial epicondyle

central ray degree for lateral knee

5-7 degrees cephalic

what is the degree of flexion for a lateral knee

20-30 degrees

centering for PA knee

mid popliteal region

collimation for PA knee

6×6

Lateral patella collimation

4×4

Centering for lateral patella

mid patellofemoral joint

settegast method central ray degree

15-20 cephalic

settegast collimation

4×4