RAD 125 knee anatomy and special projections
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22 Terms
What are the bone ends covered with in synovial joints?
articular cartilage
What are characteristics of a meniscus?
tough, rubbery, fibrocartilage
What is the purpose of bursa?
allows smoother gliding of tendons/muscles over bone or ligaments
If the patella is fractured, how much flexion will be used to get the image?
no more than 10 degrees
What angle is used on a lateral knee?
5-7 deg cephalad
What is the patient position for a Holmblad projection?
(affected) knee flexed 70 deg from full extension with tib/fib touching IR
What is the CR on a Holmblad projection?
perp tibfib and IR, at superior aspect of popliteal fossa
What is the patient position for a Camp-Coventry projection?
prone, (affected) knee flexed 40-50 deg w/ femur against IR, foot supported
What is the CR on a Camp-Coventry projection?
perp to tibfib, centered to knee
What angle is used on a Camp-Coventry projection?
40 or 50 (depending on the angle of knee flexion)
What is the patient position for a Beclere projection?
supine, knee flexed so that femur/extended tibia forms 60 deg
What is the CR for a Beclere projection?
perp to tibfib, enters .5 inch below apex
What are the two PA Intercondylar Fossa Views?
Holmblad and Camp-Coventry
What is the AP Axial Intercondylar Fossa view called?
Beclere
Of the 3 Intercondylar Fossa Views which has the least amount of distortion?
Holmblad
What is the positioning for PA Patella?
patella parallel to IR, usually heel rotated 5-10 deg laterally
Where is the CR on a PA Patella?
perp to mid-popliteal area/crease, exits patella
What are the two Tangential Patella Views called?
Settegast and Merchant
What is the patient/part position for a Settegast projection?
seated/prone, IR against anterior surface of femur, knee flexed until patella is (close to) perp w/ IR
What is the CR for a Settegast?
perp to joint space, 15-20 deg cephalad
What is the SID for a Merchant?
72
Which Tangential Patella view uses an IR holding device?
Merchant