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Preparation of the defect: The subchondral bone needs to be prepared carefully with a ring curette to be void of any calcified cartilage. Care must be taken not to violate the subchondral bone. If a previous microfracture has been performed it may be necessary to stop subchondral bleeding with a small amount of fibrin glue that can be pressed into the bleeding surface to stop the bleeding. Stable shoulders need to be created for the repair tissue to have a good attachment point.
