A combination of an acetubular liner, that is to be impacted into a shell implanted in the acetabulum using an impactor tool, and an acetubular liner insertion aid releasably mounted on said liner. The liner has a dome shaped liner body, e.g. a ceramic material liner body, with an outer surface, an inner surface defining a cavity which an opening into which a head of the impactor tool is insertable, and a planar upper surface. The insertion aid is a monolithic ring of elastic plastic material having an annular ring body, e.g. made of POM.
