Knee
The Views
AP
Lateral
Internal Oblique
External Oblique
Things You Should Know
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Cassette Size 10 x 12 lengthwise
One view per cassette
Shield
Marker
Measures 11
Hold Still
70@5
Part Position for AP
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Done in the table bucky
Patient in Supine position on table
Align knee mid-line of table
Rotate foot internally 3 -5 degrees
for true AP
CR perpendicular Tibial platea
40 SID
½” Distal to apex of patella
CR ANGLE DIFFERENCE
• Measure the distance from ASIS to
table
• 19-24 Average Patient perpendicular
• 25-up Above average Patient 5
degrees cephalad
• Below 19 Below Average 5 degrees
caudad.
Our CR Angle
• For our comp we will shoot straight in
• So our distance will be 40
• DON’T FORGET TO LINE BUCKY
Seen on Radiograph
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The distal femur
The proximal tib/fib
The femorotibial joint open
The intercondylar eminence in its
fossa.
• The fibular head imposed by tibia
Lateral Knee
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10 x 12 cassette lengthwise
Shield
Marker
Measure 10
Part Position for Lateral
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Roll patient up on affected side
Flex knee 20 degrees
Align knee to mid-line of table.
Align the epicondyles perpendicualr to
film so they are superimposed.
• Patella plane perpendicular to Film.
CR 5-7 degrees cepalad
1 inch below epicondyles
SID 40 Distance 39
Seen on Radiograph
• The distal femur and patella in
profile
• The femoral epicondyles
superimposed.
• Proximal tib/fib
Medial oblique
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10 x 12 cassette lengthwise
Shield
Marker
Hold still
Measures 10
Part position for medial
• Patient supine
• Align center knee with mid-line to
table
• Internally rotate leg 45 degrees.
CR Perpendicular
SID 40
½ in distal to patella apex
Seen on Radiograph
• The proximal tib/fib with no
imposition of head and neck of fibula.
• Patella imposing the medial condyle of
femur
• Lateral and medial joint spaces open.
• Lateral condyle of femur and tibia are
seen
Lateral Oblique
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10 x 12 cassette lengthwise
Shield
Marker
Hold still
Part Position for lateral
• Patient supine on table
• Knee align to mid-line of table
• Rotate knee 45 degrees externally.
CR Perpendicular
SID 40
½ in distal to apex of patella
Seen on Radiograph
• Proximal fibular imposed by the tibia
• Half of patella free of imposition
from lateral condyle.
• Medial condyle and tibia in profile
• Distal femur
The lower leg
Tib/fib
the Views
• AP
• Lateral
Things to know
• Cassette size: 14 X 17 turned
diagonally
• one cassette per view
• Shield
• Marker
• Measures 10
Part position for AP
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Patient Supine on table
Place shield over lap
leg fully extended
place leg in true AP position for knee and
ankle
• Femoral condyles parallel to IR
• foot flexed to 90 degree (TOES up)
• include both joints (knee & ankle) IR.
Central Ray
• 40 SID
• perpendicular to mid-leg
• Collimate to skin borders on lateral
and medial sides.
• Leave collimation open from top to
bottom
• ** can go up to 44 or 48 SID to
include more of part**
Seen on Radiograph
• The entire tibia and fibula
• both ankle and knee joint
• the condyles of tibia and femur in
profile
• the intercondylar eminence centered
in the intercondylar fossa
• some imposition of distal and
proximal tib/fib
Lateral Tib/Fib
• 14 X 17 diagonally
• shield
• Marker
Part position for lateral
• Patient on side with injured side
down
• flex knee about 45 degree to ensure
true lateral
• plane of patella should be
perpendicular to IR
• opposite leg behind injured one
• both joints included on IR
•40 SID
Central Ray
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perpendicular to mid-leg
collimation to skin borders on sides
open fully top to bottom
** can go up to 44 or 48**
Seen on Radiograph
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Entire tib/fib
both joints
tibial tuberosity in profile
fibula head imposed by tibia
distal fibula imposed on posterior
portion of tibia
• femoral condyles superimposed.
!!!Important Note!!!!
• If you can not fit entire leg on on
film...
• You must include the joint nearest
the injury on the film and take a
separate picture of the other joint.