While deep brain stimulation of the subthalamic nucleus (STN-DBS) is commonly used to reduce tremor, muscle stiffness, and bradykinesia in people with Parkinson disease (PD), preliminary studies suggest balance may worsen and falls may increase after STN-DBS. Walking speed, known to be reduced in PD, typically improves after surgery; however, other important gait qualities may not improve. Given the potential for worsening balance and gait and increasing falls after surgery, it is imperative that researchers explore interventions that complement the positive effects of STN-DBS and delay worsening of balance and gait.