1. V40™ Spigot
By using the V40™ spigot, a wide number of head options with different neck lengths are available for use with the Hipstar™ stem. The  ceramic-ceramic bearing options provide the lowest level of component wear.

2. 10mm neck diameter
The strong TMZF® Alloy allows for a thinner neck geometry compared to those of competitor stems. This design feature offers increased range of motion for the patient, and reduces the risk of impingement, wear and subluxation.

3. 135º CCD Angle
The cervico-diaphyseal (CCD) angle of 135º facilitates simultaneous leg-lengthening and lateralisation of the femur when using heads with long neck lengths.

4. Lateral fin
The tapered lateral fin is designed to be bone-preserving, to reduce the risk of trochanteric fractures and to enhance rotational stability.

5. Stem surface
An innovative process has been validated to provide a rough TMZF surface on the Hipstar™ stem to promote osteointegration. Unlike conventional roughening processes with glass or ceramics such as Alumina, this process provides a surface structure without leaving traces of other materials. This significantly reduces the potential for damage to articulating joint components by third body wear. This surface enhances osteointegration of the stem in the host bone, increasing the stability of the hip at an early stage.

Reference: S.N. Racey, A.W. McCaskie , E. Jones & M.A.Birch, “Iron and Alumina Grit Blasted TMFZ Alloys Differentially Regulate Bone Formation in Vitro”, European Cells and Materials Vol. 7. Suppl. 1, 2004 (page 81)