Smashbone fever

Smashbone Fever was a disease that caused the ligaments in a being's body to tear violently, literally smashing the bones when they ruptured. The disease was believed to be caused by a microorganism that was neither bacteria nor virus, and was considered about fifty percent fatal even when treated with muscle relaxants. Although there was no known cure for the disease, it sometimes went into remission, only to reappear later in life.