The Medline Weil Knee Walker has an unique 3 wheel design that makes it a comfortable fit for people of all shapes and sizes to use. It's easier to maneuver and get around with than unwieldy crutches and bulky wheelchairs (see how it compares to the standard four wheel model). The Weil Knee Walker may be employed in the house or outdoors. The Knee Walker is commonly used by individuals who need to keep weight off an injured foot or leg. Great for post-op recovery, foot and leg fractures, and diabetics.