Diagnostic Imaging Flashcards
Ossification of the pelvis - Birth
Upper ilium, acetabulum, lower ischium, and medial pelvis
Triradiate cartilage is not fused until
17 years old
Secondary Ossification Center - Iliac Crest
First seen at age 13 to 15 and fuse at age 15 to 17
Secondary Ossification Center - Ischium
First seen at age 15 to 17 and fuses at age 19 to 25 years
Secondary Ossification Center - ASIS
First seen about age 14 and fusing at age 16
Routine Projections - Pelvis
AP Pelvis
Routine Projections - Hip
AP
Lateral (frog leg)
Frog leg or lateral hip projection - how is the patient positioned
Flexed, ER, abducted
AP Pelvis
Entire pelvis and both hip joints
LE IR 15 degrees
Look for symmetry
Upper ilium will be more radiolucent
Ossification - femur
Shaft at birth
Head - 2nd ossification center (3-5 months old)
Greater troch epiphysis = 4 yrs
Lesser troch epiphysis = 9 yrs
Late teen fusion
Angles of inclination decrease with development
Unilateral hip AP
Allows a clearer view of the hip joint and the proximal femoral shaft
Femur is IR 15 to 20 degrees in order to place the femur in correct position
Ball and socket configuration should be obvious
Trabecula should be observable
Femoral neck angulation should 125-135 degrees
Frog Leg (lateral)
Hip in flex, ER, abd with knee flexed
View is taken AP with beam from medial to lateral hip
Lateral portion is closest to the film
Projection is 90 degrees from the straight AP
Frog leg - less troch is ___ and greater troch is ___
Lesser is anterior and more prominent
Greater is posterior
Femur with AP and lateral
Check condition of femur
Can measure Q angle
How to measure Q angle
Angle formed by lines intersecting
Center of patella to tibial tub
Center of patella and ASIS
