Lumbar Biomechanics

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Last updated 1:01 PM on 8/25/26
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20 Terms

1
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scapular spine spinal level

T3

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inferior scapular angle spinal level

T7

3
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12th rib spinal level

T12

4
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iliac crest spinal level

L4

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PSIS spinal level

S2

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cervical lordosis

30-35 degrees

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thoracic kyphosis

40 degrees

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lumbar lordosis

45 degrees

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other names for facet joints

zygopophyseal joint, apophyseal joint

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how many facet joints does each vertebrae have

4 total → 2 superior and 2 inferior

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approximate ROM for sagittal plane

flexion: 45-55

extension 15-25

total: 60-80a

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approximate ROM for horizontal plane

5-7 degrees of rotation

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approximate ROM for frontal plane

20 degrees of lateral flexion

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Passive Physiologic InterVertebral Motion

= PPIVM = passive osteokinematic motion in the spine between two vertebrae

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Passive Accessory InterVertebral Motion

= PAIVM = PAM in the spine

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lumbopelvic rhythm

how does someone bend over and stand up → describe it

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coupling

= 2 or more motions of the spine occur simultaneously

  • ex) when sidebending, your spine doesn’t go straight sideways but needs to rotate a hair


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is coupling correct

no → research shows there’s inconsistency of coupling

19
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anterior pelvic tilt

causes lumbar extension

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posterior pelvic tilt

causes lumbar flexion