Final answer:
A pillow is placed under the knees to alleviate pressure on the feet and toes, maintain spinal alignment, prevent bedsores, and improve circulation for bedridden patients.
Step-by-step explanation:
A pillow is placed under the knees to free the feet and toes of pressure. This position can reduce lower back stress and maintain the natural curve of the spine. In a healthcare context, ensuring patient comfort is very important, and one way to do this is by positioning pillows to relieve pressure points.
In addition to helping with spinal alignment, this pillow placement under the knees can aid in preventing bedsores and enhancing circulation in patients who are bedridden for extended periods.