What Causes Deterioration In Walking?

yes, My Husband has had two cerebella strokes. After the first he was able to walk after four months, talk and work, After five years, he was smoking and had another stroke that kept him from walking seven days. He had five more mini strokes according to the Neurologist but was in great physical condition as far as walking was concerned. For the last two years his walking has slowly deteriorated and he can now barely make baby steps with a walker.