“…Secondary goals may include improvements in gait efficiency 4 and appearance, gross motor function 10,14 , independence 15 , and quality of life 14,16 . Several well-designed retrospective cohort studies have demonstrated an improvement in gait or functional ability following singleevent multilevel surgery [4][5][6][7][8][9][10][11][12][13][14] . However, there have been few prospective studies, few studies that included a control group, and no randomized clinical trials to our knowledge 5,8,14 .…”