People who typically sleep on their side are familiar with the discomfort that can result from resting one knee on the other while sleeping.It is not only uncomfortable at the time,but can lead to further pain in the hip and lower back, because of the unnatural positioning of the knees.
The knee pillow is an orthopedic pillow designed to ease pain in the back,hip, and knee areas.This is accomplished by placing the pillow between the knees at night, keeping them separate and thereby reducing strain on the hipbones.
Most knee pillows are either hourglass shaped,or have a rectangular form. A knee pillow with an hourglass shape tends to stay in place overnight fairly well, because of how it contours to the general shape of the knees and legs.Since a rectangular knee pillow does not have this advantage, some models are available which include a fabric strap,which wraps around one leg to keep the pillow in place.The strap attaches to the pillow cover,which is machine washable.
The design variation of the leg and knee pillow is one which has an hourglass or butterfly shape on both sides, but can open up in the middle. This type actually has hinges on it to allow the pillow to open up and be placed flat on a bed. When open, this kind of knee pillow can be used for head and neck support, or for leg elevation. In this way, this kind of knee pillow can be used by a person who sleeps on his back as well as someone who sleeps on his side.