Externally rotated feet (also called the “Charlie Chaplin walk”) can have varying causes. Sometimes, they are a result of "flat feet” (pes planus), in which case they should be treated accordingly. Other times, however, the cause is a lower leg twisted slightly outward, i.e. an anatomical malalignment. This should be clarified in advance to verify whether PROPRIO® foot orthoses make sense for specific indications. When the cause is the first of the two, an immediate improvement in walking can generally be observed in that the foot strike of children tends to straighten with the appropriate foot orthoses. If, however, there is anatomical external rotation in the lower leg, this cannot be corrected via the muscles.