Fig. 2. Test stations 1 to 3 of HUT-4 hip simulator after 3 million cycle test with
three 50 mm Metasul MoMs, 70° inclination of cup, and 3 kN peak load. Note
pneumatic double-piston loading system capable of increased loads up to 6 kN per
station, load cell in station 2, universal joints making acetabular cups self-centring
on femoral heads, and uniform darkening of serum lubricant due to high wear.