Abstract: An osseointegration system for a long bone comprises a sleeve system comprising at least two osseointegrated sleeves being mutually uncoupled in the sense that respective ones of the sleeves do not prevent one another to perform transverse displacements relative to one another; a stem arranged for being, in said operation condition, received within the at least two osseointegrated sleeves in such manner that at least low amplitude to-and-fro axial sliding displacements of the stem relative to said sleeves are allowed; at least one fitting collar; and retaining means arranged for realizing that in said operation condition the stem is retained by the long bone.

Abstract: The invention relates to compositions, implantable devices and methods related to tissue engineering. Provided is a composition comprising (i) at least one biocompatible polymer suitable for use in tissue-engineering scaffolds and (ii) at least one metal peroxide. Also provided is an implantable device comprising said composition, and methods for tissue engineering comprising the use of the device.