Researchers studied the invertebral foramens of L5 vertebra and sacrum cadavers. Plasticene molds of the foramens were made and the volume of each mold was measured. Researchers found that as the disc height decreased, slip percentage increased, producing a reduced foramen area.
Researchers concluded that the disc height and slip percentage had the largest effect on the invertebral foramen area while slip angle changes had less of an effect on the area.
Read the abstract about invertebral foramen size.
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