Click here to download a PDF version of this application. This app can be used for sprained ankle. A sudden movement or twist of the foot rolls results in an overstretch of the supporting ligaments, causing ligament tears and bleeding around the joint. This is known as a sprain. Simply move the app over the area where you feel the most pain. These directions may be different than the video; feel free to experiment. If you're still not getting relief we recommend you contact one of our Rock Docs for medical consultation.