Fig. 5
The novel method to calculate the bedding-in and wear rate. The x and y components of the penetration vector (Xk and Yk) were independently calculated for each postoperative period (tk). Best-fit lines for \(\left({t}_{k}, {X}_{k}\right)\) and \(\left({t}_{k}, {Y}_{k}\right)\) were identified separately using the least-squares method (lower left and upper right). The x and y components of the wear rate and bedding-in were indicated by the slope (Wx, Wy) and y-intercept (Bx, By) of the lines, respectively