4. Pelvic Spinography Flashcards
Pelvic spine graphic methods of leg length evaluation:
- femoral head line
- scanogram
What is a scanogram and how is it used to evaluate leg length?
3 separate exposures on the same film of the
hip, knee and ankle joints Which limits distortions and give accurate representation of leg length
A line drawn across the most superior margins of the iliac crests on an AP pelvis spinograph
Intercrestal line
What does it suggest, when the intercrestal line is not parallel to the femoral head line?
pelvic torsion
or lateral tilt is suggested.
A line formed by connecting
two dots placed at the junction of the sacral ala and superior sacral articular facets.
Sacral base line
The shorter innominate
would be a possible indication of an _______ malposition.
extension (AS ilium)
The taller innominate
would be a possible indication of a _____ malposition.
flexion (PI ilium)
The wider ilium would be a
possible indication of an _____ malposition.
IN (external rotation)
The narrower ilium would
be a possible indication of an _______ malposition.
EX (internal rotation)
Why does Gonstead call external rotation of the ilium IN?
because the PSIS (their reference point) has gone toward the midline.
Why does Gonstead call internal rotation of the ilium EX?
because the PSIS has gone away
from the midline.
On AP pelvis spinograpjy, the sacrum is evaluated for rotational misalignment by measuring the distance from the 2nd sacral tubercle to the most lateral margin of the sacral ala. The relatively wider side is
the side of apparent ______ rotation.
posterior (posterior sacral base)
On AP pelvis spinography, lateral flexion of the sacrum is evaluated with the aid of the sacral base line which _____ with the femoral head line on the side of lateral flexion.
converges
