The Actinia® Hip Stem System features a complete range of cementless and cemented options designed for primary arthroplasty. In addition to standard stems the system offers stems with lateralised neck / offset geometry. Horizontal and vertical ribs improve axial and rotational stability and increase the contact area between prosthesis and bone. The tapered and trapezoidal cross-sectional geometries provides secure primary stability. An increased range of motion is created by a flattened AP neck geometry.