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Few patients in AIS 2-3 were affected , but disability was higher in AIS classes 4 and 5 , with difficulty in walking , taking public transport , dressing , washing and dealing with paperwork . When the operation is successful , carefully selected patients report significant improvement in walking distance , weight , and quality of life . Such care may entail a change in job , a change in walking habits , and most importantly , special shoes . As we did not land at Boston , in consequence of some detention at the wharf , until after dark , I received my first impressions of the city in walking down to the Custom-house on the morning after our arrival , which was Sunday . " It does , however , highlight the possibility that uncontrolled dynamics may not just contribute to fore and aft balance in walking but also to side-to-side balance , " said Ruina , an associate professor of theoretical and applied mechanics , who is also interested in the energetics of rowing , biking , walking , bracheating and motion in general .