Results from the preliminary hip simulator tests. (a) Partial failure in the posterior-superior quadrant at the bone-cement interface (normal walking, 15×106 cycles, BW 100 kg); (b) multiple discrete failures at the bone-cement interface (normal walking, 17×106 cycles, BW 100 kg); (c) near-complete failure at the bone-cement interface (descending stairs, 2.2×106 cycles, BW 125 kg); (d) a CT scan image showing extensive radiolucent line at the bone-cement interface of sample shown in (c).