Osseointegration system for a long bone

An osseointegration system for a long bone having an osteotomy end, the system comprising:

• a sleeve system comprising at least two sleeves, each of which is arranged for being, in operation condition, osseointegrated within the interior part of the long bone in such manner that the axial directions of the sleeves are extending in the longitudinal direction of the long bone with the sleeves being oriented substantially in line relative to one another and with the 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 arranged to protrude, in said operation condition, from said osteotomy end of the long bone, while the at least one fitting collar then is fitting onto said osteotomy end for transmitting axial loads from the osseointegration system to the long bone, and vice versa;
• and
• retaining means arranged for realizing that in said operation condition the stem is retained by the long bone.