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Positioning for Placement Blocks > Ankle > Flashcards

Ankle Flashcards

1
Q

what is the SID for ankle views

A

100-110cm

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2
Q

what is the kV for ankle views

A

60-70kV

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3
Q

what is the mAs for ankle views

A

3-4mAs

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4
Q

do you use grids for the ankle views

A

no

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5
Q

what is the AP ankle patient positioning

in terms of the leg and malleoluses

A

sit on table, affected leg extended and ankle in contact with IR

lateral malleolus posterior to the medial mortise joint

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6
Q

what joint needs to be open for an AP ankle

A

open mortise joint

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7
Q

what is the CP for an AP ankle view

A

perpendicular to midway between the intermalleolar line

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8
Q

what is the CP for an AP mortise ankle

A

perpendicular to center of the mid intermalleolar line

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9
Q

what is the patient positioning for an AP mortise ankle

in terms of the foot rotation and malleoluses

A

internally rotated foot so intermalleolar line is parallel to the IR

vertical line runs along 4/5th toe

lateral malleolus should be the same height as the medial one

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10
Q

what is the CP for a lateral ankle

A

perpendicular to the center of the medial malleolus

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11
Q

what 2 joints need to be open for an AP mortise ankle

A

medial and lateral mortise joints

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12
Q

what is the patient positioning for the lateral ankle view

in terms of the malleoluses, spong pad use, foot flexion

A

lateral malleolus of ankle in contact with IR

sponge under knee (and foot if needed)

dorsiflex foot

malleoli superimposed

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13
Q

what is the CP of an oblique ankle

A

perpendicular to midway between the malleoli

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14
Q

what is the patient positioning for an oblique ankle

in terms of leg and foot rotation

A

affected leg extended so ankle is in contact with the IR

turn foot 45* medially

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15
Q

what are the 3 ankle stress views

which needs assistance by an ED

A

gravity standard stress views

eversion and inversion stress views = need assistance

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16
Q

what are the gravity ankle stress views used for

A

medial ligamentous injury that isnt apparent on initial x-rays

weber B classifications

17
Q

what is the patient positioning for gravity standard stress views

in terms of leg, detector and foot rotation

A

patient lies on side with injured leg over edge of bed

detector placed behind heel and foot is internally rotated to mortise

18
Q

what is the image critique for an AP ankle position

in terms of the 3 joint spaces and whether they should be open/closed

A

medial mortise open

lateral mortise closed

clear joint space between the tibia and talus

19
Q

what is the image critique for an AP ankle position

in terms of superimposition of structures

A

some superimposition of the distal fibula and talus

20
Q

what is the image critique for an lateral ankle position

in terms of superimposition of structures

A

lateral malleolus superimposed over the posterior half of the tibia

talar domes superimposed

21
Q

in terms of the image critique for an lateral ankle position

what will we see if the ankle is over or under rotated

A

under rotated = shaft of fibula superimposed on tibia or anterior to it

over rotated = fibular projected too far posterior to the tibia

22
Q

what is the image critique for an mortise ankle position

in terms of the joint spaces, superimposition and malleoli

A

entire mortise joint open

superior tarsal joint free of superimposition

malleoli in profile

23
Q

what is the image critique for an oblique ankle position

in terms of joint spaces

A

distal tibiofibular joint space open

24
Q

what is the image critique for an lateral ankle area of interest

7 things

A

entire talus and calcaneus

distal 1/3 tibia and fibula

5th MT tuberosity

navicular and cubiod

25
Q

what is the image critique for an AP ankle area of interest

5 things

A

distal 1/3 tibia and fibula

lateral and medial malleoli

talus

26
Q

what is the image critique for an mortise ankle area of interest

2 things

A

distal 1/3 of the tibia and fibula

Positioning for Placement Blocks (9 decks)

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