Concordance des nÅuds de dimension $4$ We prove that for a simply connected closed $4$-dimensional manifold, its embeddings into the sphere of dimension $6$ are all concordant to each other. Keywords:concordance, cobordisme, n{\oe}ud de dimension $4$, chirurgie plongÃ©eCategories:57Q45, 57Q60, 57R40, 57R65, 57N13