“…One study included a non-randomized parallel-group trial in which participants were not assigned randomly to two groups [52]. Seven papers evaluated the immediate effect of an AFO (without adaptation) [27,29,33,36,40,43,49], and other studies assessed the short-term (< 3 months) [24,26,28,30,31,35,37,38,[40][41][42]44,48,50,52] or long-time effects (> 3 months) [23,34,39,46,47,50,51] of an orthosis. Most studies had small sample sizes (4-61 subjects), and a sample size calculation (power) was reported in five studies [36,42,45,46,49].…”