12 Questions
What is the purpose of the lordotic framework of the lumbar spine?
To assist with flexibility and increase shock absorption
What percentage of the population has a transitional vertebrae in the lumbar spine?
3% to 35%
Which part of the lumbar vertebrae increases in size as you travel caudally in the spine?
The vertebral body
What is the most frequent site of mechanical failure of the pars interarticularis?
Pars interarticularis
What part of the vertebrae is more wedge-shaped, taller anteriorly, and helps to create the normal lumbar lordosis?
Pedicles
Where are stress fractures (spondylolysis) most likely to occur due to large bending forces?
Pars interarticularis
What part of the vertebrae creates the zygapophyseal joints?
Articular processes
In the mechanism of weight transmission in an intervertebral disk, what prevents the nucleus pulposus from expanding radially?
Tension in the annulus fibrosus
What decreases the forces on the lumbar spine when lifting a load?
Lifting the load close to your body
Which direction of joint articulation primarily allows flexion and extension in the lumbar facet joints?
Sagittal plane
In which levels of the spine does the majority of spinal flexion and extension occur?
L4–L5 and L5–S1
What limits torsional stress on the lumbar disks?
Rotation allowed by the lumbar facet joints
This quiz covers the typical lordotic framework of the lumbar spine and its flexibility, as well as its ability to absorb shock. It includes information about the vertebral anatomy and associated structures.
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