Die Leiden des Herrn Karpf - Morbus Bechterew

Mr. Karpf has to go, but he does not feel well. Surely it's something serious. "It started in the bone of my thumb. And then in the index finger. The next day in the other hand as well. Then in the elbow and in the right knee. So I went to the doctor and had a checkup. He said I have the best values in over 15 years. So I'm wondering what it could be...."