Fig. 2.

Composite backside wear depth of fixed-bearing inserts was determined by taking multiple measurements and interpolating to wear at the center of the insert (arrow). Inserts typically demonstrated a backside wear “wedge,” indicated here, with more wear posteriorly and medially. Backside wear volume was calculated by multiplying the composite wear depth by the backside area. (A) The topside datum surface serving as the topside reference point. (B) The articulating bottom surface that will exhibit thickness change resulting from wear.