RESTORIS® Tapered Femoral Stem and RESTORIS® PST® Acetabular Cup Hip Implant System. This advanced hip implant system is designed to enhance stability and long-term performance. It offers an acetabular cup engineered with cutting edge Porous Structured Technology (PST®), which provides 70% fully interconnected porosity for long-term biologic fixation potential. The bone conserving femoral stem is based on a classic tapered wedge design. It is offered in 11 stem sizes, each with a standard and extended offset option that enables optimization of soft-tissue tension to establish proper restoration of joint mechanics.