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MissE
Moderator
Joined: 29 Jun 2006
Posts: 159
Location: Ohio
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 Posted: Thu Jun 29, 2006 11:46 pm Post subject: Why do we angle the tube on a knee? |
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What is the reasoning for angling the tube on a knee radiograph? |
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Adriana
Joined: 24 Aug 2004
Posts: 10
Location: San Antonio, Texas
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| Posted: Mon Jul 03, 2006 1:11 am Post subject: |
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On a lateral projection of the knee the tube is angled 5-10 degrees cephalic. This is done to superimpose the distal borders of the femoral condyles.
On an AP projection of the knee the tube is angled 3-5 degrees cephalic. This is done to open up the joint space.
Am I close? 1st year student here.  |
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xrayquilter
Power User
Joined: 04 Jul 2006
Posts: 120
Location: Ohio
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| Posted: Tue Jul 04, 2006 10:19 am Post subject: Why do we angle the tube on a knee? |
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I'm a 1st year student, also  After looking in my book, I think you hit the nail on the head with your answer! Without looking it up, I would have just said that it's done to open up the joint space!
My book says to angle 7-10* on a short patient with wide pelvis, but only angle 5* on a tall (male) patient with a narrow pelvis~~for the lateral.
For the AP, the degree of angulation depends on the size of the patient. For a patient who measures less than 19 cm. (from ASIS to tabletop), you angle 3-5* caudad. This is a person with thin thighs & buttocks.
For the patient who measures 19-24 cm. (ASIS to TT), you don't angle at all.
And for the patient who measures more than 24 cm. (ASIS to TT), you angle 3-5*cephalad. This is a person who has thick thighs & buttocks. This is the most commonly used. |
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Guest
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| Posted: Sat Jul 08, 2006 12:17 pm Post subject: Re: Why do we angle the tube on a knee? |
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| xrayquilter wrote: | I'm a 1st year student, also After looking in my book, I think you hit the nail on the head with your answer! Without looking it up, I would have just said that it's done to open up the joint space!
My book says to angle 7-10* on a short patient with wide pelvis, but only angle 5* on a tall (male) patient with a narrow pelvis~~for the lateral.
For the AP, the degree of angulation depends on the size of the patient. For a patient who measures less than 19 cm. (from ASIS to tabletop), you angle 3-5* caudad. This is a person with thin thighs & buttocks.
For the patient who measures 19-24 cm. (ASIS to TT), you don't angle at all.
And for the patient who measures more than 24 cm. (ASIS to TT), you angle 3-5*cephalad. This is a person who has thick thighs & buttocks. This is the most commonly used. |
Yes, both of you are correct. But why would we have to angle the tube to get the epicondyles superimposed? |
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xrayquilter
Power User
Joined: 04 Jul 2006
Posts: 120
Location: Ohio
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| Posted: Sun Jul 09, 2006 5:41 pm Post subject: |
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Is it because the condyles aren't on the same level straight across? I may be way off base here, but isn't the lateral condyle higher than the medial?  |
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RadMaster
Site Admin
Joined: 09 Aug 2004
Posts: 198
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| Posted: Mon Jul 10, 2006 11:50 am Post subject: Lateral Knee Radiograph |
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| xrayquilter wrote: | | Is it because the condyles aren't on the same level straight across? I may be way off base here, but isn't the lateral condyle higher than the medial? |
You are correct. It's also due to the magnification of the medial.
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MissE
Moderator
Joined: 29 Jun 2006
Posts: 159
Location: Ohio
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| Posted: Wed Jul 12, 2006 12:53 am Post subject: |
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Yes  That was the answer I was looking for. Great job everyone!! |
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