Figure 1.

Preoperative (A) and post-operative (B) standing hip–knee–ankle radiographs following primary total knee arthroplasty (TKA) of patient in the outlier group. Line B–F represents the mechanical axis of the limb. The angle formed by lines A–D and C–E represents the mechanical axis of the femur. Angle A–D–B represents the femoral mechanical axis (FMA) angle. The angle formed by lines H–K and G–I represents the mechanical axis of the tibia. The distance from point J to the mechanical axis of the limb represents the post-operative mechanical width.