Fig. 4.

A: Receiver operating characteristic (ROC) curve to evaluate the effect of pre-operative radiological parameters on the rate of distal femoral valgus cut. The blue graph shows the femoral length (FL), and the red graph shows the medial hip offset (MHO). B: ROC curve analysis of four pre-operation radiographic parameters to predict medial soft tissue release (MSTR) stage during total knee arthroplasty (TKA) surgery. The blue curve, indicating varus angle (VA) had the best performance, and the orange curve, indicating medial proximal tibial angle (MPTA) had the lowest value to predict the stage of release.