An angle of 10–12° incline between the anterior border of the tibia (shank) and the vertical (SAV) at mid-midstance has been recommended as a starting point from which the moment arm at the knee can be optimized (tuned) in children wearing fixed ankle-foot orthoses (AFOs). The aim of this study was to document the SAV and moment arm at the knee throughout stance in normally developing children. This preliminary study identifies patterns of the SAV and moment arm at the knee, throughout stance in this population. Measures of moment arm at the knee were similar to previously published work from smaller cohorts, indicating that its use as an outcome measure for tuning may be appropriate, especially if measures are taken over more than one gait cycle.
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