A femoral component having a head portion with an outwardly facing bearing surface and an opposing inner surface configured to fit over a prepared femur The femoral component also includes a stem portion which is for insertion into the prepared femur, the stem portion having a first end for engagement with the inner surface of the head portion. The head portion is provided on the inner surface with engagement means suitable for releasable engagement with complementary engagement means provided at the first end of the stem portion. The stem portion comprises a non-resorbable portion comprising the engagement means and a resorbable portion. The engagement means may, for example, be screw threads, bayonet fittings or push or press fit fittings of complementary tapers.