Posterior Inferior Subluxation Ilium

Life University Gonstead Study Club

Pelvis

2Life University Gonstead Study Club

Directions of Ilium Misalignment

The basic directions that the ilium can become misaligned with the sacrum

Anterioward Posteriorward Medialward Lateralward


Where the Misalignment Occurs

Occurs in the sacroiliac articulation Tendency to think subluxations occur at the hip joint

Emphasis is placed on the Ilium

An AS/PI misaligned ilium travels in an arc due to: Nature of the auricular surfaces of the joint Angle of the pelvis itself


Changes Accompanying the AS and PI Ilium

AS Ilium in innominate

measurement diagonal length of obturator lumbar curve Lowers femur head height Edematous joint space opens at

posterior-inferior and anterior-superior margins

Leaves sacrum posterior in relation to the ilium

PI Ilium in innominate

measurement diagonal length of obturator lumbar curve Raises femur head height Edematous joint space opens at

posterior-superior and anterior-inferior margins

Leaves sacrum anterior in relation to the ilium


Measurement of an AS Misalignment


Measurement of a PI Misalignment



AS Ilium in innominate measurement

diagonal length of obturator

lumbar curve Lowers femur head height Edematous joint space opens at



PI Ilium in innominate measurement

diagonal length of obturator

lumbar curve Raises femur head height Edematous joint space opens at




Normal Obturator Appearance


Obturator Appearance in PI/AS Misalignment



AS Ilium in innominate measurement diagonal length of obturator

lumbar curve Lowers femur head height Edematous joint space opens at



PI Ilium in innominate measurement diagonal length of obturator

lumbar curve Raises femur head height Edematous joint space opens at




Lumbar Curve Changes



AS Ilium in innominate measurement diagonal length of obturator lumbar curve

Lowers femur head height Edematous joint space opens at



PI Ilium in innominate measurement diagonal length of obturator lumbar curve

Raises femur head height Edematous joint space opens at




Femur Head Height Changes


AS Ilium Raising Femur Head


PI Ilium Raising Femur Head



AS Ilium in innominate measurement diagonal length of obturator lumbar curve Lowers femur head height

Edematous joint space opens at posterior-inferior and anterior-superior margins


PI Ilium in innominate measurement diagonal length of obturator lumbar curve Raises femur head height

Edematous joint space opens at posterior-superior and anterior-inferior margins



Area of the Spongy Disc in AS & PI Ilium



AS Ilium in innominate measurement diagonal length of obturator lumbar curve Lowers femur head height Edematous joint space opens at



PI Ilium in innominate measurement diagonal length of obturator lumbar curve Raises femur head height Edematous joint space opens at




Mechanism of In/Ex Ilium


Changes Accompanying the In and Ex Ilium

In Ilium in width in width at the base of obturator lumbar curve Edematous joint space opens at

entire anterior margin Raises the femur head height Foot will diverge further away from

the median line

Ex Ilium in width in width at the base of obturator lumbar curve Edematous joint space opens at

entire posterior margin Lowers the femur head height Foot will converge toward the

median line


Ilium Width Changes



In Ilium in width

in width at the base of obturator

lumbar curve Edematous joint space opens at


the median line

Ex Ilium in width

in width at the base of obturator



median line


Normal Obturator Appearance


Obturator Appearance in In/Ex Misalignment



In Ilium in width in width at the base of obturator



the median line

Ex Ilium in width in width at the base of obturator



median line


Lumbar Curve Changes



In Ilium in width in width at the base of obturator lumbar curve

Edematous joint space opens at entire anterior margin

Raises the femur head height Foot will diverge further away from

the median line

Ex Ilium in width in width at the base of obturator lumbar curve

Edematous joint space opens at entire posterior margin

Lowers the femur head height Foot will converge toward the

median line





entire anterior margin

Raises the femur head height

Foot will diverge further away from the median line


entire posterior margin

Lowers the femur head height

Foot will converge toward the median line


In Ilium Raising Femur Head


Ex Ilium Lowering Femur Head




entire anterior margin Raises the femur head height

Foot will diverge further away from the median line


entire posterior margin Lowers the femur head height

Foot will converge toward the median line


A-P Film Marking Procedure







Documents

Posterior Inferior Subluxation Ilium