Fig. 5.

Validation trials for patch-roughening (by grit blasting) of otherwise undamaged femoral component heads showed close agreement of UHMWPE removal in a laboratory wear simulator (Leeds ProSim; Prosim Ltd, Leeds, UK) versus for identical motion and loading inputs programmed in the finite element model. Peak wear depth experimentally averaged 0.783 mm (standard deviation = 0.09 mm) versus 0.76 mm computationally. Directionally, experimental (average) versus computational wear directions differed by approximately 9º.