I thought that you'd rather prefer an answer in english; if you want it in german please let me know.
One of the best foot surgeon faculties in germany is that of the university of Dresden:
You can phone the secretary or write a letter. It will ne necessary to send at least x-rays an the doctors notes, operation reports and other medical reports. A trip to dresden with a personal examination will also be mandatory.
If there is a reasonable treatment option I cannot say with the pesent information, but I am sure that the doctors in Dresden are able to give you a substantial advice and useful recommandation.
Best regards,DR OACK
you have recieved my answer. If you have no further questions I ask for a positive evaluation in order to reward my answer.