Sacrum Lab Flashcards
What is the respiratory effect of inhalation upon the sacrum?
- abdominal cavity contents increase in AP diameter as diaphragm flattens
- lumbar lordotic curve decreases (flattens out)
- sacral base moves posteriorly
- sacral apex moves anteriorly
What is the respiratory effect of exhalation upon the sacrum?
- abdominal cavity contents decrease in AP diameter as diaphragm domes
- lumbar lordotic curve increases
- sacral base moves anteriorly
- sacral apex moves posteriorly
Lumbar Spring Test
- pt prone, use one or both palms to firmly push the lumbosacral junction in an anterior direction several times
- negative test = ease of springing; preference for anterior/forward sacral base motion
- positive test = resistance to springing; preference for posterior sacral base motion
Lumbar Spring Interpretation: Negative
Negative: flexed
- left/right unilateral flexion
- R/R sacral torsion
- L/L sacral torsion
- bilateral flexion
Lumbar Spring Interpretation: Positive
Postive: Extended
- left/right unilateral extension
- R/L sacral torsion
- L/R sacral torsion
- bilateral extension
Backward Bending Sphinx Test
1) pt prone
2) physician determines static position of and monitors bilateral sacral sulci and/or ILAs
3) pt instructed to push up on their elbows in extended position (sacral base should move anteriorly and ILAs should move posteriorly)
Positive sphinx test
inequity between right and left increases (worsens) = posterior/backward
left/right unilateral extension
L/R sacral torsion
R/L sacral torsion
Negative sphinx test
sacral sulci and ILAs even out during the exam = anterior/forward
Left/right unilateral flexion
L/L sacral torsion
R/R sacral torsion
What could a deep on right sacral sulcus indicate?
right unilateral flexion
left unilateral extension
L/L sacral torsion
L/R sacral torsion
What could a deep left sacral sulcus indicate?
left unilateral flexion
right unilateral extended
R/R sacral torsion
R/L sacral torsion
What could a posterior/inferior ILA on the right indicate?
right unilateral flexion
left unilateral extended
R/L sacral torsion
R/R sacral torsion
What could a posterior/inferior ILA on the left indicate?
left unilateral flexion
right unilateral extension
L/R sacral torsion
L/L sacral torsion
Where do you gap the SI joint to facilitate extension?
posterior via internal rotation
Where do you gap the SI joint to facilitate flexion?
anterior via external rotation
Bilaterally extended sacrum findings
bilaterally positive lateralization = false negative bilateral posterior sacral sulci bilateral anterior/superior ILA \+ LS false - BBT