Abstract: A mobile orthopedic device to support a disabled leg of a standing patient while the leg is bent at the knee, especially as when partially amputated or encased in a cast or support device. A base having peripheral caster wheels supports a medial upstanding support shaft that is adjustable for height. The upper portion of the support shaft carries a horizontal support with padded upper surface configured to cradle the knee and adjacent lower leg of a patient. A handlebar assembly extends upwardly from the forward end of the horizontal support to aid user support, steerage and maneuvering of the device. A medial, adjustably depending foot optionally aids positional maintenance of the support on a supporting surface. A first species provides a releasable, adjustably positionable strap and knee pad that are carried on the upper surface of the horizontal support to aid positional maintenance of a supported leg to prevent overturning of the support in a forward direction.