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SIJ Flashcards

1
Q

The sacrohorizontal angle is ___ degrees.

A

40 degrees: the angle between the horizontal plane and superior surface of the sacrum at L5/S1

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2
Q

The base of the sacrum is naturally inclined (anteriorly/posteriorly) and (superiorly/inferiorly) when standing.

A

anteriorly, inferiorly

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3
Q

The sacrohorizontal angle provides ____ and ____ forces.

A

anterior shear and compression forces

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4
Q

The greater the lumbar lordosis, the (lesser/greater) the sacrohorizontal angle

A

greater

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5
Q

What is the largest axial joint in the body that transfers the load between the LEs and spine?

A

SIJ

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6
Q

The SIJ is designed for (stability/mobility)

A

stability

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7
Q

The SIJ has ___ degrees of freedom.

A

6 degrees

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8
Q

(true/false) no muscles are designated to move the SIJ in active motions.

A

true

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9
Q

Movement at the SIJ happens as a result of ___ and ___ acting on the trunk and LEs.

A

gravity
muscles

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10
Q

What stabilizes the joints of the SIJ?

A

pelvic floor muscles

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11
Q

How many degrees is SIJ FLX/EXT?

A

3 degrees

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12
Q

How many degrees is SIJ axial ROT

A

1.5 degrees

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13
Q

How many degrees is SIJ lateral bending?

A

0.8 degrees

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14
Q

SIJ motion is greater in (single/double)-leg stance

A

single-leg stance

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15
Q

Describe anterior torsion.

A

Innominate rotates anteriorly
ASIS moves inferiorly
PSIS moves superiorly
Inferior and posterior glide of ilium on the sacrum

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16
Q

When does anterior torsion occur?

A

unilaterally with EXT of the freely swinging leg

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17
Q

Describe posterior torsion.

A

Innominate rotates posteriorly
ASIS moves superiorly
PSIS moves inferiorly

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18
Q

When does posterior torsion occur?

A

unilaterally with hip FLX (OKC)–> superior/anterior glide of ilium on sacrum

Unilaterally with single leg stance –> superior/posterior glide of ilium on the sacrum

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19
Q

Describe inflares.

A

Innominate rotates inward on sacrum
ASIS moves medially
PSIS moves laterally

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20
Q

Describe outflares.

A

Innominate rotates outward on sacrum
ASIS moves laterally
PSIS moves medially

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21
Q

Describe up-slip.

A

Superior translation of innominate on sacrum

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22
Q

Describe down-slip.

A

Inferior translation of innominate on sacrum

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23
Q

Describe nutation.

A

Sacrum glides posterior inferior on innominate

Another way to describe this is:
Anterior sacral flexion on posterior iliac rotation (anterior sacral tilt)

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24
Q

Describe counter-nutation.

A

Sacrum glides anteriorsuperior on innominate

Another way to describe this is:
Posterior sacral extension on iliac rotation (Posterior sacral tilt)

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25
What is the origin of the transversus abdominis?
internal surface of costal cartilages 7-12 thoracolumbar fascia iliac crest connective tissue deep to the lateral 1/3 on inguinal ligament
26
What is the insertion of the transversus abdominis?
linea alba aponeurosis of internal oblique pubic crest pecten pubis
27
What is the INNV of the transversus abdominis?
thoracoabdominal nerves (T6-T12) 1st lumbar nerve
28
What are the origins of the erector spinae?
broad tendon posterior sacrum SI ligament lumbar SPs sacral SPs supraspinous ligament
29
What is the insertion of the iliocostalis?
angles of lower ribs cervical TPs
30
What is the insertion of the longissimus?
ribs between the tubercles and angles cervical TPs
31
What is the INNV of the erector spinae?
posterior rami of spinal nn.
32
What is the origin of the gluteus maximus?
ilium posterior to the posterior gluteal line dorsal surface of sacrum and coccyx
33
What is the insertion of the gluteus maximus?
IT band (lateral condyle of tibia) Gluteal tuberosity
34
What are the actions of the gluteus maximus?
Thigh EXT, ER assists in sit to stand
35
What is the INNV of the gluteus maximus?
Inferior Gluteal nerve (L5-S2)
36
What is the origin of the gluteus medius?
External surface of the ilium between the anterior and posterior gluteal lines
37
What is the insertion of the gluteus medius?
lateral surface of the greater trochanter
38
What is the action of the gluteus medius?
Thigh ABD, IR Keeps pelvis level during swing phase
39
What is the INNV of the gluteus medius and minimus?
Superior Gluteal nerve (L4-S1)
40
What is the origin of the long head of biceps femoris?
ischial tuberosity
41
What is the origin for the short head of biceps femoris?
linea aspera lateral supracondylar line of the femur
42
What is the insertion of the biceps femoris?
lateral side of the head of the fibula
43
What is the action of biceps femoris?
Knee FLX and ER Thigh EXT Hip ER
44
What is the INNV of the long head of the biceps femoris?
Tibial division of the sciatic nerve (L5-S2)
45
What is the INNV of the short head of the biceps femoris?
Common fibular division of the sciatic nerve (L5-S2)
46
What is the origin of the iliacus?
superior 2/3 of the iliac fossa iliac crest sacral ala anterior SI ligaments
47
What is the insertion of the iliacus?
lesser trochanter and shaft inferior to it Psoas Major tendon
48
What does the iliacus do?
thigh FLX (OKC) Pelvic Tilt (anteriorly) stabilize hip joint while acting with psoas major
49
What is the INNV of the iliacus?
Femoral Nerve (L2-L3)
50
What is the origin AND insertion of the puborectalis?
Body of the pubis
51
What is the action of the puborectalis?
Tenses the pelvic floor helps close rectum responsible for fecal incontinence
52
What is the INNV of the puborectalis?
Nerve to Levator Ani (S4)
53
What is the origin of the pubococcygeus?
pubic bone
54
What is the insertion of the pubococcygeus?
coccyx and lower sacrum
55
What is the INNV of the pubococcygeus?
Nerve to levator Ani (S4)
56
What is the origin of the iliococcygeus?
obturator foramen
57
What is the insertion of the iliococcygeus?
sacrum
58
What is the INNV of the iliococcygeus?
Nerve to Levator Ani (S4)
59
What is the primary action of the erector spinae?
Bilateral back EXT unilateral SB
60
What effect does the erector spinae have on the SI joint?
Amplifies the SI joint motion
61
What is the primary action of the multifidus?
Back EXT SB ROT
62
What effect does the multifidus have on the SI joint?
imparts sacral FLX Forces closure of the SI joint with the abdominals
63
What effect does the gluteus maximus have on the SI joint?
Stabilization
64
What is the primary action of the piriformis?
Hip ER
65
What effect does the piriformis have on the SI joint?
May alter SI joint motion via the direct attachment to the ventral aspect of the sacrum
66
What effect does the transverse abdominis have on the SI joint?
forces closure of the SI joint
67
What effect does the iliacus have on the SI joint?
Synchronous tilting of the pelvis and sacrum anteriorly (CKC)
68
What effect do the Levator Ani muscles have on the SI joint?
Imparts sacral EXT
69
Anterior pelvic tilt (Flexes/extends) the lumbar spine
extends (increases lordosis)
70
Anterior pelvic tilt shifts the nucleus pulposus (anteriorly/posteriorly) and reduces the diameter of the intervertebral foramen.
anteriorly
71
Anterior Pelvic tilt (shortens/lengthens) the lumbar extensors and hip flexors
shortens
72
Posterior pelvic tilt (flexes/extends) the lumbar spine.
flexes (reverses lordosis)
73
Posterior pelvic tilt shifts the nucleus pulposus (anteriorly/posteriorly) which increases the diameter of the intervertebral foramen.
posteriorly
74
Posterior Pelvic tilt (shortens/lengthens) the abdominals and hip extensors
shortens

Clinical Interventions (25 decks)

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