Kernrechtsfrage
Whether the revision-based reduction of the whole disability pension to a quarter pension was justified by a lasting improvement in health and earning capacity.
Extrahierter Entscheid
The existing file did not allow a reliable assessment of whether the orthopedic condition had permanently improved since the 2002 MEDAS assessment; further orthopedic evidence was required.
Extrahierte Begründung
The court found a major discrepancy between the 2002 MEDAS expertise and the 2007 report. The latter could indicate improvement, but it also largely reflected a different appraisal of an essentially unchanged condition. Because the decisive question of a durable improvement under Art. 17(1) ATSG could not be answered reliably, the factual record was incomplete.