Fig. 2

Procedure from the initial bone cutting to setting the final component. First, a 4-mm pre-cut (red dotted line) was performed (a). Second, PS PCT was set on the pre-cut surface (b). According to the gap measurement, after adjusting the cutting line of the posterior condyle posteriorly or anteriorly, a drill hole is made to install the cutting device (c). When the flexion gap was larger (or smaller) than the extension gap, a surgeon could control the additional cutting line (black dotted line) posteriorly (or anteriorly) in 1-mm increments using a thicker (or thinner) spacer (c). Lastly, the femoral trial component was set after flexion gap control (d). PS PCT, posterior-stabilised pre-cut trial component