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MSK: LQ > lecture 4a: anatomy and biomechanics review of SI joint > Flashcards

lecture 4a: anatomy and biomechanics review of SI joint Flashcards

1
Q

what complex is the primary stabilizer for static and dynamic task

A

lumbo pelvic hip complex

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2
Q

t/f: isolated problems in this area are RARE

A

true

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3
Q

what joint is the intersection between spine and lower extremities

A

SI joint

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4
Q

what contributes to dx of ‘non-specific LBP’
in 15-30% of individuals

A

SI joint pain

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5
Q

what kind of joint is the sacrum

A

facet joint

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6
Q

what is the articulation of the base , apex and ala of the sacrum

A

base- w 5th lumbar vertebra
apex- w coccyx
ala- ilium

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7
Q

what is the origin of the piriformis

A

anterior aspect of s2. s3. s4

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8
Q

what side of the sacrum is concave and convex

A

anterior side is concave
posterior side is convex

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9
Q

the sacrum is __- fused sacral vertebra

A

5

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10
Q

what forms the median sacral crest

A

4 fused spinous tubercles

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11
Q

the posterior side of the sacrum is attachments for what mm’s

A

ES
multifidi
glute max
T-L fascia

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12
Q

what forms the innominates of the pelvic

A

ilium , ishchium and pubic bone fuse at
acetabulum to form each innominate

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13
Q

___ of each innominate articulates w/
the sacrum = SI joint

A

Ilium

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14
Q

___ ___ of each innominate
articulates w/ the other at pubic
symphysis

A

pubic bone

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15
Q

what motions does the anterior SI ligaments limit

A

all motions

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16
Q

what SI ligaments are part of SI joint pathology: pain generators

A

anterior SI ligaments
posterior SI joint ligaments

17
Q

what is the most important ligaments of SIJ

A

interosseous SI ligaments

18
Q

what motion does the Interosseous SI ligament limit

A

anterior and inferior movements of sacrum

19
Q

what motion does the posterior SI joint ligament limit

A

limit ant iliac rotation (or sacral counternutation)

20
Q

what 2 ligament of the SIJ limit posteior iliac rotation (or sacral nutation)

A

sacrotuberous ligament
sacrospinous ligament

21
Q

what is a common source of groin pain …. particularly in athletes

A

pubic symphysis

22
Q

what are the pelvic floor mms

A

• Levator ani mm.
• Pubococcygeus
• Puborectalis
• Iliococcygeus
• Coccygeus m

23
Q

what does the pelvic floor mm assist in

A

lumbopelvic stability

24
Q

what are the Only 2 muscles can directly
produce SI joint motion

A

• Piriformis
• Pubococcygeal

25
Q

what is the primary function of the piriformis

A

-• Hip ER and abd
• When hip flex >90°, piriformis
becomes hip IR

26
Q

what is included in the posterior oblique system

A

Lats, contralateral glute max, T-L
fascia

27
Q

what is included in the anterior oblique system

A
  • EO and IO, contralateral hip add
    and ant abdominal fascia
28
Q

what is included in the lateral mm system

A
  • Glute medius and minimus,
    contralateral hip add
29
Q

what is included in the inner mm system

A
  • Multifidi, TA, pelvic floor and
    diaphragm
30
Q

what does the inner mm system stabilize

A

SI joint

31
Q

what is the nerve supply for the anterior and posteior portion of the the SI joint

A

anterior : posterior rami L2-S3

posterior: posterior rami L3-S3

32
Q

how does the base and the apex move for sacral nutation (flexion)

A

• Base moves anterior and inferior
• Apex moves posterior and superior

33
Q

what is sacral nutation (flexion) motion limited by

A

SI, sacrotuberous & sacrospinous ligaments

34
Q

during sacral nutation( flexion) how does the innominates move and it ___ lumbar lordosis and ___ hip flexion

A

posteriorly (posterior pelvic tilt)

decrease

increase

35
Q

how does the base and the apex move during sacral counternutation (extension)

A

• Base moves superior and posterior
• Apex moves inferior and anterior

36
Q

what is sacral counternutation(extension) motion limited by

A

SI ligaments

37
Q

how do the innominates move during sacral counternutation (extension) and this lead to ____ lordosis

A

anterior innominates which leads to increased lordosis

38
Q

posteior innominate leads to sacrum ____

A

nutation (sacrum flexed)

39
Q

____ ` innominate 🡪 sacrum
counternutation

A

Anterior (sacrum extended)

MSK: LQ (10 decks)

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