A sprain consists of a laceration or rupture of the ligaments surrounding and supporting the joints, in consequence of unnatural strain brought to bear upon them. To relieve the pain, apply fomentations; to prevent inflammation, apply cold after the pain is relieved. The joint should be kept at perfect rest until the inflammation has subsided. A person should never attempt to walk with a sprained ankle or to use a joint that has been injured in this way until the inflammation has been entirely subdued, as permanent injury to the joint may result unless rest is secured. In some cases, the application of a pasteboard splint upon either side of the joint, secured in place by the bandage, is a useful measure.