Deep brain stimulation
STN/GPi stim may help just as medication adjustment does
Decreasing frequency later in course may help balance1
STN DBS long term effects debatable on gait and balance2
Sometimes using proximal leads can help
Experimentally looking into PPN stimulation for gait and balance problems3
1 Moreau, et al. Neurology. 2008 Jul 8;71(2):80-4.
2reviewed in Boonstra, et al. Cur Opin in Neurology 2008; 21:461-471.
3Stefani, et al. Brain. 2007 Jun;130(Pt 6):1596-607. Epub 2007 Jan 24.