My idea is that Lindsay went to sleep after she was trapped in the Human Centipede. The next day the police department got scared when the two detectives they sent never returned. So they sent the GSG9 or whatever Germany's SWAT team is called and they found Lindsay stuck in the room. They called a surgeon to separate her from the rest of the centipede and brought her to a hospital. Lindsay got plastic surgery to fix her face and had the ligaments in her kneecaps and her teeth eventually replaced and went on to speak at Jenny and Katsuro's funerals and spoke about the horrors of the Human Centipede. Kranz and Voller's bodies were recovered during the search of the Villa. Dr. Heiter's body and his villa were burned, and everything valuable inside was sold and the money used to fund the funerals and to have Lindsay's ligaments and teeth replaced.