Exam 4 Flashcards

1
Q

lumbar vertebrae are taller:

A

anterior

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2
Q

lumbar ligament that resists most motions?

A

iliolumbar ligament

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3
Q

disk is very wedge shaped at what level?

A

L5/S1

-to help with articulation with sacrum

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4
Q

weakest point at interbody joint:

A

where endplate meets bone

-endplate more strongly bound to the intervertebral disk than the bone

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5
Q

tension in disk during twisting motions:

A

about half of the fibers experiencing tension around disk

-reduced ability to resist torsion

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6
Q

iliac crest at what spinal levels:

A

L4-5

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7
Q

PSIS at what spinal level:

A

S2

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8
Q

tissue of annulus fibrosus:

A

fibrocartilage

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9
Q

zygaphophyseal joints resist what motion?

A

shear forces

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10
Q

lumbar spine flexion ROM:

A

40-50 degrees

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11
Q

lumbar spine extension ROM

A

15-20 degrees

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12
Q

lumbar spine lateral flexion ROM

A

20 degrees

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13
Q

lumbar spine rotation ROM

A

5-15 degrees

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14
Q

normal lumbopelvic rhythm:

A

40 flex L spine

70 flex hip

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15
Q

L spine open pack:

A

neutral

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16
Q

L spine closed pack

A

full extension

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17
Q

L-spine capsular pattern:

A

side flexion and rotation equally limited

-then extension

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18
Q

interbody joints innervated by:

A

ventral rami

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19
Q

z joint capsules innervated by:

A

dorsal rami

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20
Q

psoas major innervation:

A

L1 spinal nerve

-femoral nerve (L2-L4)

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21
Q

quadratus lumborum

A

1-3 lumbar spinal nerves

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22
Q

rectus abdominis innervation:

A

intercostal nerves T7-T12

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23
Q

abdominal innervations:

A
  • lower intercostal (T7-T12)
  • iliohypogastric
  • ilioinguinal (L1)
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24
Q

which back muscles reduce anterior shear?

A

erector spinae

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25
Q

what force on the L-spine is more likely to cause an injury?

A
  • shear

- compression can handle a greater extent

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26
Q

why is flexion more likely to cause injury in L-spine?

A
  • does have more compression but not close to compression max
  • causes shear force that is close to shear tolerance
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27
Q

approximate discal pressure standing in neutral:

A

400 N

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28
Q

max normal discal pressure:

A

10-15 kN compression

1000 N shear cyclic

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29
Q

loads caused by flexion:

A

can exceed 1000 N shear or 3000 N compression

30
Q

load distribution in neutral L-spine:

A

80% compressive force borne by IVD

31
Q

spine with no muscle can buck at:

A

20 N

32
Q

aspects of a squat lift:

A
  • shorter external MA
  • more neutral spine position possible
  • less metabolically efficient
  • greater potential forces at other joints
33
Q

aspects of a stoop lift:

A
  • larger external MA
  • flexed spine/hip position
  • more metabolically efficient
  • decreased potential stress on other joints
34
Q

have an increased compression/shear with what postures?

A

flexed

35
Q

muscles activated during a sit up:

A
  • latissimus dorsi
  • pectoralis major
  • obliques
  • rectus abdominus
  • transversus abominis
  • iliacus
  • rectus femoris
36
Q

function of the pelvic girdle:

A
  • supports weight of the body
  • transmits ground forces upward to the vertebral column
  • supports and protects pelvic viscera
  • muscle attachment
  • birth canal
37
Q

pelvic inlet:

A

-superior

oriented more vertically

38
Q

pelvic outlet:

A
  • inferior

- oriented more horizontally

39
Q

number of coccyx vertebrae

A

3-5 vertebrae

4 most common

40
Q

primary sacroiliac ligaments:

A
  • dorsal sacroiliac
  • ventral sacroiliac
  • interosseous sacroiliac
  • iliolumbar ligament (has 3 bands)
41
Q

secondary sacroiliac ligaments

A
  • sacrotuberous ligament

- sacrospinous ligament

42
Q

lower band of iliolumbar ligament called:

A

lumbosacral ligament

43
Q

zygapophyseal joints at lumbosacral junction face:

A

more posterior than medial

44
Q

structures that resist the natural anterior shearing force at the L5-S1 junction

A
  • intervertebral disk
  • capsule of apophyseal joints
  • ALL
  • iliolumbar ligaments
  • articular facets at the junction
45
Q

effect of pelvic tilt on lumbosacral angle

A

anterior pelvic tilt: increases angle

-posterior pelvic tilt: decreases the angle

46
Q

parts of sacroiliac joint:

A
  1. synovial
    - L shaped
    - planar
  2. fibrous synarthrosis
    - tuberosities
47
Q

cartilage type on the sacral part of SI joint?

A

hyaline cartilage

48
Q

cartilage type on the ilial part of SI joint?

A

fibrous

49
Q

what age does the SI joint have capsular thickening and joint surface unevenness?

A

teens

50
Q

what age does the SI become concave/convex?

A

young adult

51
Q

what age does degeneration of the SI joint start?

A

mid-third decade

52
Q

strongest SI ligament:

A

interosseous ligament

53
Q

indirect SI ligaments:

A
  • sacrospinous

- sacrotuberous

54
Q

axis of rotation for nutation/counternutation

A

medial-lateral

  • at S2
  • shifts with motion
55
Q

nutation/counternutation degrees of motion:

A

1-4 degrees

56
Q

SI open pack position:

A

counter nutation

57
Q

SI close pack position:

A

nutation

58
Q

capsular pattern of SI joint

A

pain with stress on joints

59
Q

first line of defense for SI stability:

A

locking mechanism of body weight

60
Q

second lines of defense for SI stability:

A
  • stretches ligaments

- active muscle force

61
Q

lumbopelvic rhythm at end range flexion:

A

-relative counter nutation as pelvis anterior tilts

62
Q

lumbopelvic rhythm with initial trunk flexion:

A

-initial spina flexion with sacral nutation

63
Q

ligaments that stretch with nutation torque from gravity:

A
  • interosseous lig.
  • sacrotuberous lig.
  • sacrospinous lig.
64
Q

what kind of torque does gravity put on the sacrum?

A
  • nutation torque

- adds stability

65
Q

ligaments of pubic symphysis:

A
  1. superior pubic ligament

2. inferior (arcuate) pubic ligament

66
Q

posterior pelvic arch function:

A

weight transfer from above to LE’s

67
Q

anterior pelvic arch function:

A

-prevents posterior SI separation and strut for compressive forces coming from ground reaction

68
Q

muscles contributing to anterior pelvic tilt:

A
  • hip flexors

- back extensors

69
Q

muscles contributing to posterior pelvic tilt:

A
  • trunk flexors

- hip extensors

70
Q

muscles contributing to lateral pelvic tilt:

A

-hip abductors
-lateral trunk flexors
(contralateral)

71
Q

____ precedes an increase in intraabdominal pressure:

A

pelvic floor muscle contraction

72
Q

causes of SI pathology:

A
  • stepping into a hole unexpectedly
  • child birth/pregnancy/nursing
  • repetitive unidirectional torsion
  • falls
  • weak stabilization
  • genetic joint surface differences
  • osteoarthritis