Hip & Pelvis

Question 1

What are the normal views of the hip & pelvis

Answer 1

AP sacrum
Lateral sacrum
AP pelvis
AP hip

Question 2

What are the special views of the hip & pelvis

Answer 2

AP coccyx
Lateral coccyx
Frog leg projection

Question 3

What is teardrop distance

Answer 3

The distance between the most medial margin of the femoral head and the outer cortex of the pelvic teardrop is measured

Average = 9mm

Question 4

What is hip joint space width

Answer 4

Superior joint space (average = 4mm)
Axial joint space (average = 4mm)
Medial joint space (average = 8mm)

Question 5

What is Kleins line

Answer 5

A line to the outer margin of the femoral neck, femoral head shoulder overlap

If no overlap could be a slippage of the femoral capital epiphysis

Question 6

What is acetabular depth

Answer 6

A line from the superior margin of the pubis at the symphysis joint to the upper outer acetabular margin

Male average = 13mm
Female average = 12mm

Question 7

What is protrusio acetabuli

Answer 7

A line from the pelvic inlet and outer boarder of the obutorator foramen

Question 8

What is shentons line

Answer 8

A curved line from the undersurface of the femoral neck across the joint to the inferior margin of the superior pubic ramus

The line should be smooth, an interrupted line suggests dislocation, femoral neck fracture or slipped femoral capital epiphysis

Question 9

What is the femoral angle

Answer 9

Two lines parallel to the mid axis of the femoral shaft and femoral neck

< 120* = coxa vara
> 130* = coxa valga

Question 10

What is the symphysis pubis width

Answer 10

The measured distance between the opposing articular surfaces between the superior and inferior margins

Male average = 6mm
Female average = 5mm