Instrument for holding an acetabular cup

A system comprising an acetabular cup and an instrument for holding said acetabular cup,

• said acetabular cup having a polar axis, and a rim lying in a plane generally perpendicular to said axis, said rim having at least one pin receiving hole therein located on a first side of a plane containing said polar axis and having a hood extending axially away from said rim on a second side of said plane containing said polar axis, said acetabular cup further having a concave generally spherical bearing surface therein open at said rim and defined at least in part by said hood, that portion of said bearing surface defined by said hood extending radially inwardly relative to said polar axis,
• said instrument having an elongate hollow tubular member having a proximal end and a distal end and a generally transverse end face at the distal end thereof;
• at least one pin extending axially outwardly from said transverse end face;
• an elongate rod;
• said elongate hollow tubular member including means for supporting said elongate rod to permit axial movement of said elongate rod relative to said elongate hollow tubular member;
• and
• a ball attached to one end of said elongate rod proximate said transverse end face and moveable together with said elongate rod, said ball having a spherical surface for engaging at least that portion of said bearing surface defined by said hood that extends radially inwardly relative to said polar axis.