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12 Cards in this Set
- Front
- Back
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Normal lordosis in the lumbar spine is how many degrees?
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45 degrees
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Is there more lordosis in sitting or in standing?
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Sitting-more pressure on the disc
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The facets of the lumbar spine have what orientation?
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Oriented in the sagittal plane
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What forms can facets take in the lumbar spine?
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Flat, C shape, J shape
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What is the average anterior tilt of the sacrum when measured from horizontal?
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60 degrees
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Does shear at L5 increase or decrease as the angle of anterior tilt of the sacrum increases?
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Shear increases
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08% of disc ruptures occur where?
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At L4/5 and L5/S1
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What is the ROM for movements in the lumbar spine?
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50 deg flexion
15 deg extension 5 deg rotation (in each direction) 20 deg SB (in each direction) |
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What structures resist flexion of the lumbar spine?
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Muscles, annulus of the disc, other ligaments and facets
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What structures resist extension of the lumbar spine?
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ALL, anterior annulus, hip flexors and facet approximation
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How are lumbar vertebrae designed to bear weight?
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They have large vertebral bodies and thick discs
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What is the normal load distribution in the lumbar spine?
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80% in vertebral body and disc
20% in facets |
