- Worse conditions due to walking with the VI Knee are denoted with a ‘⊛’ and red shading, improvements due to using the VI knee are indicated by a ‘*’ and green shading. For Symmetry, more similar behavior between the affected and intact legs was seen as improved performance while less similar behavior a detriment. Improvements in Maximum Trunk Rotation and P-T Correlation are defined as reductions while using the VI Knee compared to the C-Leg. For subject S4 walking at 1 m/s, there was no significant difference in hip ROM symmetry (#), however, the individual did show a substantial increase in hip range of motion