A patient presents with a one-year history of weakness of th…

A patient presents with a one-year history of weakness of the left soleus muscle, (2/5 with MMT), resulting in excessive knee flexion during early through late midstance.  Quadriceps strength on the left is 4/5 but the patient complains of constant achiness and fatigue in the anterior thigh during prolonged gait. Of the following, the best orthotic choice would be: