An ankle stress machine particularly suited for use in the X-ray examination of ankles is disclosed. The ankle stress machine includes a planar base (11) having an aperture (12) near one end suitable for receiving a standard X-ray cassette (14). Mounted on the base (11) is a calf restraining mechanism...http://www.google.de/patents/US4323080?utm_source=gb-gplus-sharePatent US4323080 - Ankle stress machine
