He was on the road to recovery from the original cruciate ligament tear, sustained in a league game against Borussia Dortmund in December, before suffering a major setback with an identical injury last week.
Ten months out
During the operation, the torn ligament was removed. When the scars from the previous operation heal over, a new artificial cruciate ligament can be inserted. In the meantime, Badstuber will resume physical therapy.
Early indications suggest that he will be out of action for a further ten months. While his career is not thought to be in serious danger, the German international faces a race to fit in time for the 2014 FIFA World Cup in Brazil.