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Poly(lactide-co-glycolide)-bilayeredscaffoldswiththesameporosityordifferentonesonthetwo layerswerefabricated,andtheporosityeffectoninvivorepairingoftheosteochondraldefectwas examinedinacomparativewayforthefirsttime.Theconstructsofscaffoldsandbonemarrow-de- rivedmesenchymalstemcellswereimplantedintopre-createdosteochondraldefectsinthefemo- ralcondyleofNewZealandwhiterabbits.