Abstract: A protective knee guard is provided to shield the wearer's knee from injuries due to impact on the knee, from twisting of the knee and the like. The knee guard comprises a pair of rigid arcuately shaped guards. One of the guards is attached to a pivoted brace frame at a location above the knee so that the arcuate guard portion extends downwardly over the knee. The second guard portion is attached to the frame below the knee and extends upwardly so that the arcuately guard portion overlies the knee. In a straight leg position of the wearer, the arcuate guard portions are nested one under the other. As the wearer bends the knee, the guard portions unnest until they reach a position where the ends overlap only slightly, if at all.