The wear of Ultra-High Molecular Weight Polyethylene has generated new concern regarding the long-term clinical performance of total joint replacements. To extend the lifetime of artificial joints, it is necessary to decrease tt-le wear rate of UHMWPE. One possible solution is the incorporation of aramid fibres. Wear rates were determined with a pin-on-roll apparatus with a nominal contact stress of 3.0 MPa at a sliding velocity of 0.24 m/s. The volumetric wear rate decreases with the incorporation of the fibres. A minimum in wear rate is observed at 5 volume percent fibres.